I eventually made sure to cover Skye's legs and her butt. She tensed again as I reached under her skimpy bikini bottoms, but didn't stop me from feeling her up at any point.
Aurora was next. She'd been watching me with Skye the whole time and knew exactly what to expect. She was even more shy and tense to start with, but once she relaxed she stayed that way.
It was like having her body melt under my fingers as I rubbed her all over, from neck to feet. I was more cautious initially about grinding on her ass, or sneaking feels of her tits and booty, but the more I got away with, the less restrained I felt the need to be. I could just play and we'd both enjoy ourselves.
My sister was last up. She'd been observing and noting, but she all too eager to put the research away and lie down when I approached her.
"You're getting your shorts all full of sunscreen at this rate," Nova told me.
"I suppose I am," I agreed.
"Bit of a shame," she said.
I glanced at Skye and Aurora, knowing I didn't have to worry about what my sister would think, even if she hadn't already thickly hinted at it. I shrugged and pulled my shorts and underwear off, getting naked for the three girls. There were gasps and murmurs from Skye and Aurora, and nothing more than a silent, pleased smile from Nova as she made herself comfortable.
I wasn't about to be the only one naked. I liked the attention, and it did feel incredible to let my free erection rub directly on my baby sister's hot skin, but I still intended to make things more even.
Nova pretended not to even notice when I untied her bikini top while I massaged sunscreen into her. She couldn't ignore the removal of her bottoms quite so easily, and she gave me some cute little noises and wiggles as she was stripped nude. She even arched her back and stuck her butt out, inviting me to rub there as well. As if there was any chance in hell I was skipping over my sister's tight little bum.
I rubbed Nova down for much longer than necessary. Well past the point any argument could be made that she needed more sunscreen coverage. Much of that time was incidentally spent grinding on her ass as well. I was horny and softly panting, and mixed plenty of precum in with the sunscreen on her butt and lower back.
Eventually I thought she must have had enough and I was pushing my luck to go any further. I stood up, and almost immediately Nova rolled over.
"You missed my front," she informed me. She tried to keep her expression neutral, but her eyes were so gleaming and excited for me to keep rubbing her all over, in front of her friends no less.
This led to me covering absolutely every inch of Nova from the neck down, as well as carefully doing her face. There was something oddly intimate in the latter, though her naked body was the more obviously horny part of the experience.
Nova was absolutely soaked by the time I graced her with some attention to her pussy. I'd worked over everywhere else thoroughly before finally touching her there.
"He's really gonna," Aurora whispered.
"Yeah, just watch," Skye hissed back.
"She's his sister though," Aurora said.
"You knew this was coming," Skye giggled.
Aurora made a strangled little noise, but her eyes never left Nova and me.
"You know we can hear you, right?" Nova said lazily. She grinned at me as she spoke. She wasn't bothered. If anything, she was loving showing off like this.
It was so hot rubbing my sister's pussy in front of her friends. I got that. The added thrill of it. But at a base level I just loved making Nova feel good. I was feeling more and more comfortable with that part of myself. Like it was just part of who I was now.
I rubbed Nova so good, getting her all built up, then smirked and looked deep in her eyes.
"Cum for me, ok?" I said.
Her eyes widened. "Don't!"
I smirked wider. "Cum for you brother. Be a good little sister. Cum for your big brother."
"Dooonnn't," Nova whined. "Not this time."
"Yes this time," I insisted. "Your brother wants your cum, ok? Do it for me."
I kept murmuring to her, but she came pretty quickly once I got into our usual incestuous finisher. It would have been more intense for her, knowing both her best friends were watching what got her off. She came so hard for me, like a good sister.
I told her so, too. "Good sister," I praised. "Good girl. Very good."
"Stop," she mumbled. "I already came."
"Yeah you did."
Skye awkwardly cleared her throat next to us. "Um... I could be a good sister too, I think."
I blinked at her, slowly smiling again as I saw the horniness and need in her.
Nova, still in post-orgasm relaxation and bliss, laughed and gave me a push. "You heard her."
I tweaked my sister's nipple fondly in parting, and moved straight on to her friend.
Skye stiffened as I removed her bikini top and tugged down her bottoms, but didn't protest and even helped me out getting her naked. She needed assistance relaxing and feeling comfortable was all. Once I started playing with her and all that built up arousal had somewhere to go, she relaxed pretty well.
Since I hadn't slathered her front all over in sunscreen beforehand, I experimented with sucking on Skye's tits while I rubbed her pussy. I wasn't sure she'd want me to, but she happily moaned in encouragement.
She liked it even more when I sucked on her pussy, as I'd hoped she would. I really found myself enjoying eating pussy, and apparently that wasn't limited to only my sister.
I looked up at Skye when she got close to cumming, rubbing her with my fingers while my tongue was otherwise occupied.
"Be a good sister and cum for me," I told her, feeling like it would work under the circumstances. "Cum for your big brother."
I heard Nova snickering about it, but Skye did in fact cum for me as I finished her off with some more clit-sucking. I was quite pleased with myself, and Skye had a happy, contented face when I looked up at her.
"So the incest thing is looking like a good angle," Nova mused over the sound of her pen rapidly scratching across her notebook. "Not even just for you and me, Sol, as I had previously assumed. This is why doing the research is important."
I declined to ask what exact difference that knowledge made for her. It didn't really matter. To me, it was just hot and fun that I got to eat out another 'sister' just now.
"You're so scientifically minded," I told Nova, voice laden with sarcasm.
"I'm glad you understand that now," she replied without a hint of irony. "I was afraid you wouldn't."
"Oh I understand all about you," I said.
Nova paused. "That sounded vaguely insulting, somehow."
I beamed innocently. "Who, me? Never, I assure you."
She narrowed her eyes. "If you don't believe in the research..."
"No no, happy to help with that," I said.
I rose from Skye and padded slowly over to my sister, dick hard and swaying. I enjoyed the way her eyes widened and fixated on my erection as I approached. For a moment, I just let my cock stick out practically in Nova's face, but not quite close enough to touch, then I bent down and gave her a quick bite on the shoulder.
Nova made a cute, surprised noise and almost immediately clapped a hand over her own mouth as though embarrassed by it.
"But I do think sometimes we're just being horny and slutty, and science has very little to do with it," I said in a low, deliberate voice.
I wasn't sure what I expected from Nova, but the way her eyes lit up was not it.
"You think I'm slutty?" she asked.
"I mean... I said we," I said, confused. "But yeah, kinda."
Nova grinned and flipped her book to a different page. I didn't even want to ask what kind of information I'd just helpfully bestowed upon her.
I turned toward Aurora instead. She'd been very quiet, and was curled up in a shy ball on her lounger. She blushed as I looked right at her, but she didn't outright avoid eye contact.
"Do I... have to do the incest thing?" Aurora asked tentatively.
I perked up at the implication that she wanted some sexy fun, just not the kink part of it.
"Aw come on," Skye giggled. "It's fun." She looked up at me with some very cute eyes. "You made me feel so good, big brother."
Skye laughed as I groaned and very obviously produced some more precum from my twitching cock. The liquid drooled off the tip, making my feelings and state of horniness way too clear.
"Sol does enjoy that kind of thing," Nova agreed.
"Not just me," I said.
"No," Nova purred. "Not just you. But right now... mostly you."
"Are you taking notes about how I react to girls calling me big brother?" I asked my sister.
"Hehe, what do you think?" Nova said. "I thought you just liked it when it was me. But you like Skye saying it too. And... probably Aurora?"
Aurora was still blushing furiously, and held her arms tighter around her knees, but she took a deep breath and gave in.
"Please... big brother?" she said.
Nova and Skye cheered. I wasn't sure how much was for Aurora participating, and how much was for the way my cock twitched as she spoke those words.
I focused on Aurora to avoid the overstimulation of Nova and Skye joking back and forth and teasing me. She similarly did her best to ignore her friends.
Aurora took some work to get her to open up. She was shy about revealing herself, but very horny too. It made for a delicate but fun dance teasing her arms away from their protective lock and slipping her top off. The more I played with her chest and down her sides and tummy, the more she let her legs fall away too and allow me access her warm, needy body.
"This is gonna feel good, right?" Aurora asked.
"I think so," I told her. "You'd have to ask Nova or Skye though, they're the ones who've been on your end."
"Not right now I think," Aurora said. "Let's just try it."
"That's the spirit!" Nova praised. "It will feel good though. Definitely."
Aurora bit her lip, still not looking at her friends, and opened up her legs to me. Her bikini bottoms were enticingly wet, and though she still acted shy about it there was an eagerness in her as I removed them.
I sucked on Aurora's tits while rubbing her pussy until I felt she had properly melted for me, and was fully relaxed to my touch. I then moved downward so I could lick her pussy. She really liked that part, and the remainder of her inhibitions seemed to leave her.
"Oh that's nice," she whispered.
I happily sucked on Aurora's clit, making her whimper in even more pleasure. I heard Nova and Skye murmuring and giggling to each other, but kept them tuned out until I made Aurora cum.
I was pretty proud of myself after her. Three girls in a row letting me play with their pussies and cumming for me.
"Good boy," Nova said, sneaking up behind me while I was watching Aurora recover her senses. "Really being a good brother today," she added, running her finger up my spine.
"You're obsessive," I said.
Nova leaned right in next to my ear. "Oh? So you don't want to keep playing with your little sis-ters?"
"Novvv," I whined.
"Yeah you do," she said. "I know you do."
"You're getting dangerous," I said.
"That's one word for it," Nova said flippantly. "Knowledge is power. For instance... I know what you need now. And if you're a good boy, you'll get it."
She had her tits pressed up against my back, whispering sweet promises in my ear. There was a cynicism to the way my sister cajoled me, but it was very much rooted in us having a fun time together.
Succumbing to Nova meant her and her friends nakedly crowding around me, playing with me, running hands and mouths over me. It was hard to hold her manipulations against her when they worked out so wonderfully for me.
"Feels so weird," Aurora said, her fingers loosely wrapped around my cock. "So hard and... pulsing."
"Unf, nice," Skye said. "Let me try."
Nova had her fingers in my hair and her tits in my face. There was a slight sunscreeny taste to her nipple at first, but that faded and I just enjoyed sucking on them.
"See, you're getting taken care of too," Nova told me softly.
"Never doubted it," I mumbled. "Does it all have to be so... experimental though?"
"But it is experimental," Nova said. "Whether I write it down or not. None of us really have that much experience. This is valuable whether you want to admit it or not."
I nodded, holding her close, enjoying how it felt to put my hand on her back and press her into my body. "You make a good point," I said. "I... I like learning with you."
"I knew you would," Nova said. "Science doesn't have to be boring."
I moaned softly as Skye and Aurora took turns flicking their tongues over my cock and giggling to each other.
"It's definitely not always boring," I agreed.
"Let me know if it ever is boring," Nova said seriously. "Because we can fix it if so."
I had to process that one for a moment. "The science? Or y--"
"Yeah, the science, obviously," Nova said a little too quickly.
I didn't want to push that one too hard. Not right now at least. It was hard to fathom that my sister would be worried about me getting bored. Of all the things she might be, boring was not one of them.
If she did have those kinds of fears, it explained her friends' presences some more. I did fully believe that all three girls were interested in the experience. It would be very like Nova to achieve multiple goals at once. She could very well be giving them chances to play with me and trying to keep things novel and exciting at the same time.
Admittedly, it was working. I'd never experienced anything close to three naked girls all over me at the same time, let alone two of them sharing my cock and either rubbing it or taking turns daring to lick it. It was intense and wonderful, and something I'd be fantasizing about for a long time to come.
I made sure to keep lavishing attention on Nova; holding her, rubbing her, sucking her tits, nipping at her shoulder and neck. I was increasingly distracted, however, and I could only last so long before Skye and Aurora made me cum hard. It was much needed, and kind of shut me down in ecstasy overload.
Cum got everywhere. The girls squealed and laughed as it caught them on the face or hands. A lot of it landed back on me as well. I moaned and shook through it, feeling my cock spurt over and over, making an absolute mess.
Nova was grinning to herself and stroking my hair soothingly. That was the first thing I noticed when I was able to notice anything at all again. Then it was Skye and Aurora sitting up and comparing the errant streaks of cum on their faces. Aurora seemingly won, having caught a shot right across one eye somehow.
"Good boy," Nova praised me softly. "Good boy. Good brother."
I whimpered and nuzzled against her tits. Not horny just now, but happy for any comfort she could provide. I felt oddly delicate and exposed all of a sudden, though that faded away pretty quickly and I just felt lovely and relaxed.
I felt quite pampered once Skye and Aurora finished comparing cumshots and cleaned themselves and me up, followed by proper application of sunscreen to all exposed areas. Nova didn't go anywhere the whole time, ostensibly for my sake, but she also seemed quite content where she was. Enjoying the closeness as much as I was, if not more so.
"Shouldn't you be writing some things down about now," I asked her as her friends returned to their own seats but she stayed where she was.
"I'll get to it," Nova said without any sense of urgency.
I smiled and nudged her to stretch out with me, crowding our lounger, but making it very cozy with the two of us naked and lying out in the sun together.
She had thoughts about Skye and Aurora's reactions to my cumming on them. I knew she did. And about the way they'd played with the cum on me before wiping it up. I was actually kind of curious what sorts of things she'd write in her notebook. I wondered if she'd let me read it at some point.
But for now, I rated higher than her research, and that felt really nice. Perhaps I should insist on more naked sibling cuddles without her notes in easy reach. She might even go for it.
Things were changing. She couldn't pretend this was all just for research anymore. Not the way she snuggled with me and caressed me and occasionally whispered in dulcet tones. I rather enjoyed whatever it was happening between us, though I was hesitant to take that line of thought too far just yet.
****
All three of us stayed naked outside for a while. It was a funny thought when it eventually occurred to me how I didn't even stay horny the whole time. It was just a normal thing after a while. Nice for sure, and I enjoyed the view any time I looked about me, but not bringing up any particular urge to act.
Eventually, reluctantly, I decided I'd had enough sun and had to part with the wonderfully naked sister-cuddles. Nova pouted about it too, though acknowledged that she also would do well to head back inside soon.
I intended on a quick shower to rinse off any sunscreen before getting dressed again, but wasn't overly surprised to receive a visitor.
"Hey," Skye said, slipping into the shower with me. "Best to save water, right?"
She was a touch shy about it, but mostly showed a decisive boldness in the move. I wasn't about to kick her out in any case. Especially once her wet butt grazed my cock and stirred it back to life.
We helped each other wash off, though it was all just excuses to feel each other up. In particular me washing Skye's hair for her while her wet little booty was firmly pressed against me, trapping my cock between us.
I let my fingers drift downward, all the way down between Skye's legs where I rubbed her pussy while she gasped and let her ass grind back on my cock.
Nova and Aurora came into the bathroom as well, just about perfectly timed for Skye to cum on my fingers. Skye did her best to not make it obvious she was cumming, and Nova and Aurora were chatting away sufficiently that they might not have heard Skye's cute little cumming noises.
"You two having fun in there or what?" Nova teased. "Better have saved some hot water."
I helped Skye out of the shower, now that she was a touch wobbly on her legs. Nova gave me a smirk, then stepped past me into the shower, tugging Aurora along with her. The two of them weren't quite as sexual about it as Skye and I, but even just nakedly and platonically helping each other out under the cascading water was quite sensual and fun to watch.
After drying off, I took a seat on the floor facing the shower just to keep watching. Skye joined me, curling up with me and idly running her hand up and down my cock. Just casually jerking me off while we took in the scene of my baby sister in the shower with her friend.
It was all at least partly for my benefit. It wasn't like Nova regularly showered with her friends, even platonically. If this was more of her research, I couldn't really understand how much she could get out of it. Surely the fact that I enjoyed watching naked, wet, slippery girls helping each other wash themselves couldn't be much of a revelation.
"You're super into your sister, huh?" Skye whispered to me, still stroking my cock.
I blushed, knowing I was being pretty obvious about it. But then, it wasn't coming as news by this point.
"Yeah," I said.
"Good," Skye said. "That's as it should be."
"For... siblings?" I asked, confused.
"Not generally. But you two, yes," Skye said. She shrugged. "I wasn't sure about it at first, but I've come around."
"Oh," I said. "Good?" Her hand still felt amazing on me. "You weren't sure, but you still participated?"
"Yeah, of course," Skye said, grinning enigmatically. "The general premise of being able to try some stuff out in a low-pressure environment was tempting. And, you know, I didn't mind playing with you some. It would have been weird to date or anything though."
Right," I said. I felt like the way things were currently was far weirder than just dating, but I sort of took her point.
"I did worry for Nova a bit though," Skye said. "She can overthink things sometimes and get herself in trouble."
"I don't know that overthinking is anyone's worry just now," I said.
Skye giggled softly. "That's only because you don't think like your sister. But then, hardly anyone does. That's part of why I love her."
I had to agree with that. Even if I didn't understand exactly what Skye was referring to, she was absolutely right in a general sense. No one thought quite like my sister, and that was indeed part of what endeared her to me and others. When it wasn't the source of exasperated frustration at any rate. Though for siblings, perhaps that was part of the basis for connection and love by default.
"Me?" Skye continued. "I would have been too jealous for something like today. Probably for sharing at all, actually. It wouldn't have occurred to me to consider the risks and rewards in the same way Nov would. Or to be willing to experiment with my own feelings on the line like that."
"Wait, what are you saying exactly?" I asked her.
Skye gave me a small, mysterious smirk. "Not my place to tell if you still need to ask."
"That's a nonsense answer. And kinda mean."
"Hehe, isn't it though." Skye rubbed her thumb over the head of my cock, sending pleasant thrills down my spine. "I think you'll be fine though."
Nova and Aurora stepped out of the shower, rather freezing my brain activity in place. Skye was probably right. Things were working out amazingly well for me, even if there was something I was missing. I should be used to that though, since when it came to my sister I was almost always a few steps behind. Not because she was smarter necessarily, though arguably she was, but just because of how easily she went off on wild mental paths that more or less made sense, but were nigh impossible to follow without a helping hand.
Skye amusedly jerked me off while I stared fixedly at Nova and Aurora drying off. Then, almost as a tease, the girls wrapped themselves in their towels, achieving a certain modestly if that word had any meaning between us at this point. Skye joined them too, leaving my poor cock untouched now that I was extremely horny all over again.
"We're gonna get dressed for a comfy movie night," Nova told me. "And get some snacks. If you want to join."
"I might hang out a while," I decided.
Still naked and prominently erect, my attempt at sounding casual probably didn't get me very far. It was worth a try anyway.
****
My cock actually had a chance to settle back down before movie night got going. I wandered about in pyjama pants and no shirt--a deliberate choice on my part--growing slightly impatient with the girls as they took their sweet time. The sound of occasional laughter coming from my sister's room made me wary of intruding. I had enough sibling self-preservation instincts not to intrude just now. It wasn't my place.
They eventually came out again, though dressed so casually I had to wonder what had taken so long. Just in long shirts, all three of them, and I caught just a flash of some sexy panties on Aurora that didn't cover much of her butt.
"Our hair was all wet and kind of a mess," was all Nova offered by way of explanation for the wait. "Had to sort it out."
"So not making secret schemes without me?" I inquired.
"We can do two things at once," Nova said airily.
"Of course you can," I said. "And... is that my shirt?"
Nova grinned.
"Wait, are those all my shirts?" I demanded.
"Thought you might enjoy it," Nova said, batting her eyes.
"When did you even steal those?" I asked.
She just winked and breezed away.
All four of us hit the kitchen to assemble snacks. We probably overdid it a bit, but we'd had a busy afternoon too, and were collectively hungry.
I kept finding myself staring wistfully at one girl or another. All three of them in my shirts, teasing me with possessiveness of some kind. The effect was all the stronger for the fact that I had so recently become intimately familiar with their naked bodies, and could easily conjure those memories again.
Nova caught me and my longing gazes more than once, and kept jotting it down in her notebook. It occurred to me that part of what had taken so long in her room might have been writing things down comparing and comparing notes with her friends. She'd been awfully restrained about it otherwise this afternoon.
"Yes, I'm enjoying you all wearing my shirts," I finally gave in and told her in response to her continued studies.
"Yeah," Nova said. "I know. I have eyes."
"Is it supposed to mean you're all claiming me, or vice versa?" I asked.
My dear sister leaned in to whisper to me. "No idea," she said. "But you liiike it anyway."
"... it's annoying that you're correct," I said.
I tried to pinch Nova's butt, but she skipped out of reach again.
We all settled in the living room once we had our snacks gathered up. We left the lights off, leaving things dim and cozy, mainly only the light from the tv illuminating things.
Nova placed me in the middle of the couch with her on one side, Skye on the other. Aurora tried to sit on the far side of Nova, but was nudged over to sit on my lap instead.
Aurora seemed a bit shy about her seat, but didn't mind it, even when having her in my lap got me hard again. She kept wiggling and softly giggling to herself as my cock hardened beneath her, and I had to lift her a bit a couple times to reposition. I ended up nestled between her butt cheeks, both of us occasionally grinding in small movements on the other.
Nova and Skye cuddled in pretty close on either side of me, but otherwise acted like it was a perfectly normal movie night. They snacked and made occasional jokes, and seemingly ignored Aurora and I being naughty in between them.
They did actually make sure I got offered some snacks or sips of a drink here and there, since I was pretty blocked off otherwise. I couldn't even really see much of the movie most of the time with Aurora in my lap. Which was fine, since playing with her was far more interesting anyway.
I really had the time and freedom to feel Aurora up however I wanted. Mostly I had my hands up under her shirt, to a point where Nova and Skye just started offering me bites of snacks straight to my mouth since my hands were busy.
Aurora got so horny as I felt her tits, teased her nipples, caressed her tummy, and kissed the back of her neck and her shoulders. I could feel her grinding back against me more and more insistently, though she wouldn't actually come right out and ask for me to go lower with my fingers. Possibly because it would be embarrassing for her to ask that with her friends right next to us.
I eventually ventured down to Aurora's panties, and immediately got a small but very satisfied sigh from her. She was soaking wet, and happily let me slide right into her panties to play with her pussy.
Aurora's little whimpers and the way she squirmed had to have been noticeable. Nova and Skye still acted like I wasn't fully fingering their friend right between them. Still just watching the movie and trading pithy comments.
Aurora eventually came on my lap. I was quite pleased with myself for getting her off, and very, very horny. She stayed where she was a bit longer, letting me hold her and cuddle her through her come down, then slid off of me.
As though rehearsed, Skye traded out places with Aurora and took over my lap as her throne. She rather cheekily tugged my pyjama pants down and off, leaving me fully naked with a prominent boner. I was happy to oblige her, since it meant more direct contact with my erection and her panty-clad booty when she sat down.
"Settle down you two," Nova said, still acting oblivious to the reason we might be causing disturbance.
I leaned over and gave my sister a nip on the shoulder as chastisement. She made a happy little moan and snuggled closer.
Aurora too was cuddled up pretty close on my other side, leaving my arms slightly pinned in. Being smothered by cute, horny girls was a really nice feeling as it turned out.
Getting to play with Skye was pretty fun. She was even more actively encouraging of my caresses, going so far as to move my hands where she wanted them and grinding very deliberately against my cock as a reward for making her feel good.
As I got Skye more and more turned on, she eventually lifted her butt up and slid my cock under her so she could grind her pussy on it instead. It was through her panties--her increasingly wet panties--but was still so very close to her bare pussy, and it felt incredible.
"Don't make him cum yet," Nova said.
Skye whined. "I knooowww, but it's so hard!"
"Restraint? Or Sol's cock?" Nova asked.
"Both," Skye said.
"You can... make me cum," I said. "If you want."
Nova bit my shoulder sharply. "No cummies! Not yet. Be a good brother, ok?"
"That makes it challenging, you know," I growled at my sister. "Skye's... getting me pretty excited here."
"Unf, am I?" Skye asked while forcefully rocking back and forth along my cock.
"You know you are," I said.
Nova was insistent I not cum though, so I took some control back by getting a hand down Skye's panties. Once I was rubbing her clit, she was a lot less needy about sliding her pussy all around on my cock.
I managed to get Skye off while maintaining my own composure, earning Nova's favour. The two of them switched places, Skye moving somewhat slower as she clambered off of me.
My sister was downright enthusiastic about taking a seat on my lap. Pretty horny by now, I realized. She'd had to wait through her friends getting to cum first and really wanted her turn.
It was even more than that, though. It took me a few seconds for my brain to process it, but as my sister pressed her tight little booty to my cock, there was no material at all between us.
"Nov?" I said in a strangled voice.
"Yeah?" she said.
"Are you not wearing panties?"
Nova shrugged. "Maybe not. Why?"
My cock nestled snugly in my baby sister's butt crack. Nothing between us. Just firmly wedged between her butt cheeks.
I couldn't say anything. I had no words. I pressed my lips to the back of her shoulder, just about where it met her neck, and tenderly bit her.
Nova gasped and couldn't help herself rocking against me, really grinding on my erection.
I slid my hands under her shirt, then gave up on subtlety and pulled it off her entirely. We were left both naked and grinding together, flanked tightly on either side by her slightly less horny and still somewhat clothed friends.
I wanted to cum pretty badly, but I wanted Nova to feel good too. I mimicked what I'd been doing with Skye and lifted my sister so I could trap my cock under her pussy instead of against her ass.
Nova whimpered and really focused herself on rocking back and forth, sliding her soaking wet pussy across my length over and over. I knew it was bad, but I couldn't help myself trying to move such that the head of my cock caught against her pussy just a little every time she was in the right spot for it.
"Sol," she panted. "You're gonna do a bad thing if you keep that up."
"I know," I told her.
"Unf. But then you'd be inside me," Nova pressed.
"Yeah, I know. You probably better make me cum," I said, kissing the back of her shoulders. "I'm getting... needy."
She pushed a little extra, nearly popping me inside her. I groaned in disappointment at nearly feeling it. This really was bad. I wanted to be in my sister. The urge was becoming overpowering. I wasn't used to it. But if she was going to let me get so horny and rub her pussy all over my cock like this...
"Sol?" Nova asked quietly.
"Yeah?"
"What if you were inside me though?"
I moaned and nipped at her the way she liked. "Don't tease me."
"I'm not," she said. "What if you were?"
"That would be... a lot," I said. "And it would be really nice. Unf. Damn, Nov, that would be amazing actually."
Nova stopped moving, with great reluctance, and slowly spun herself around in my lap to face me. She looked straight into my soul, the colours of the tv behind her providing an eerie sort of illumination.
"It would be... my first time doing... that," she said hesitantly.
"Yeah," I said. "Mine too."
"Is that ok, you think?" Nova asked, clearly looking for one specific answer.
"I think I'd really like that," I said. "I think that might be wonderful."
Nova nodded, giving a shy little smile. "Me too." She bit her lip. "Take me to bed?"
"Yeah," I said, trying to sound casual. "That's a good idea."
I tried to ignore Skye and Aurora grinning at us while Nova and I stood up. I had eyes only for my sister right now anyway. She looked so pleased and hopeful, and sinfully horny too. I felt like I must have appeared much the same.
Nova's hand slipped into mine, and we moved toward our bedrooms. It was a slow, cautious walk at first that quickly became a mad dash. I wasn't even sure whether we were headed for my bed or hers, but knew that we'd end up in one or the other within mere seconds.
It was hers, as it turned out. And even though I only had a fraction of a second to appreciate the sight of my eager little sister naked and bouncing into bed, needing me there with her so badly, that particular image was forever seared into my brain.
I was on top of her before she had any chance at all to plead for me to join her. We were both painfully, stupidly horny and needful of each other right now. Two excited, inexperienced, downright virgin siblings wanting so badly to share our first time together.
"Not how I thought this was gonna be," I admitted in a low voice.
"Me either," Nova said. "It was only supposed to be learning with you."
"It... still could be," I said, vocalizing one of the most difficult sentences of my life. "We could still stop now. We don't have to do this."
Nova looked at me with an expression that both made me shiver with arousal, and broke my heart a little.
"Don't make me beg," she said.
I grinned in relief. "Wouldn't dream of it. Just checking. You're... most definitely who I want."
"Good," she said. "Me too."
Skye and Aurora strolled in while I was positioning my cock against Nova's pussy. My sister got to have her friends with her, one on each side, holding her hands for emotional support while I sank into her for the first time.
My sister's pussy was a heavenly treasure, making me feel perfectly complete as it enveloped me. We both made some embarrassingly cute little noises as I filled her up. She was so wet and ready for me, easy to enter, but so tight, warm, and welcoming too. Like I was existentially home for the first time ever.
"Oh fuck yesss," Nova hissed softly. "More, ok? Do it."
"Novaaa," I moaned. "Why do you feel so good?"
"It's amazing," she said. "Keep going."
"Of course," I said.
I buried my face against her neck, letting my hips do their thing. In and out of my sister's precious little pussy. The absolute most perfect feeling in the world.
"I... do need to cum pretty bad," I said.
"I know," Nova said tenderly. "I know, Sol. I wasn't sure if I wanted this to happen, and whether I wanted it to last a long time or a short time." She made a happy, purring noise. "I realize now how silly that was. Just... do what feels good, ok? Don't think about it too much."
"Ha, ridiculous advice coming from you of all people," I said.
"Isn't it?" Nova giggled. "But for real." She nipped at my ear. "Just enjoy it. I am."
"Mmm, me too," I assured her. "So fucking good."
"Mmhm. Keep fucking me, ok Sol? Like a good big bro-ther?"
I giggled as I kept thrusting into her. "Don't do that! I really will cum too fast."
"Cum when you want to," Nova teased. "Just as long as you do. Cum for your sis-ter."
"Stop!" I laughed.
I shut her up at least temporarily by biting at her shoulder and neck, making her gasp and writhe beneath me. Her cute mewling drove me even crazier though, and I lost myself to the moment.
I exploded inside Nova. Inside my recently virgin little sister. My cum seemed endless and brought new satisfaction and relief with every shot. I felt so utterly transcendent and at peace as I filled Nova's pussy with brotherly cum. Like it was the most perfect and natural thing in the world.
Nova retrieved her hands from her friends and rubbed my back, holding me close and teasing her nails up and down my spine.
"Good brother," she cooed. "Good boy. So good."
"I came in you," I told her.
"Hehe, I know," she said. "Trust me, I know."
"That was... that was so amazing," I said. "So perfect."
"It was," Nova agreed. "Better than anything I hoped for."
I felt two bodies leave the bed. Skye and Aurora giving us privacy, perhaps. Nova and I stayed right where we were, hardly moving other than to breathe, and the loving sensation of her fingers up and down my back.
It was a while before either of us spoke again. I didn't have anything to add to the moment. Nothing that could make it any more perfect than it already was.
"I really didn't intend this," Nova finally said.
"You don't regret it, do you?" I asked.
"Not on your life," she said firmly. "Just... I didn't set out to seduce you like this. I want you to know that."
"I'm glad it happened either way," I said.
"Same," Nova said. "I think it's better this way too."
"Better than what?"
She shrugged. "I wanted to learn. Maybe get some experience. So I wouldn't feel so lost finding a boyfriend or having sex and stuff. It's kinda scary in some ways."
"I get that," I said.
"You were great. Too great, actually," she laughed softly. "The perfect boy to try stuff out with. And then... it got to be more than just experimentation."
"Kinda did, huh?" I said bemusedly. "I'm glad though, because I think if you didn't want more than experimentation it would have been difficult for me."
"Oh?" Nova said.
"Yeah. I think I would have struggled," I said. "I don't exactly what I would have felt, but I think it wouldn't have been good sooner or later."
"Sorry," she said.
"Don't be," I said.
"No, I am though," Nova said. "I didn't think about that. That I could actually hurt you. I see it now. I just thought it would be fun and educational. I forgot brothers have real feelings too."
I knew she was half-teasing, but she was definitely sincere enough too. I nipped at her bottom lip, just testing.
"Hey, Nov? Would it be ok if..."
"Hm?"
"..if I kissed you?"
My sister's eyes widened. "Oh yeah! Oh, we haven't done that, huh?"
"Not so much," I said. "Funny how we skipped that one."
"Well, you know, it was just science, a lot of it. Kissing kind of makes it real."
"Nov, you've got a pussy full of my cum. If it's not real yet--"
"Hehe, no, it's real," she said. "You know what I mean though." Her fingers were tender on my cheek. "It wasn't something I was going to do before I realized that I want it to be real." She sighed. "Really putting a damper on me finding a boyfriend though."
"Maybe a brother is better?" I suggested.
"Yeah, maybe it is," Nova said. "You gonna kiss me or what?"
I grinned and went for it. As ridiculous as it was to be naked and post-coital and still feel such electric nerves about a simple kiss, that was exactly what I felt. Kissing my sister. Releasing emotion more subtly but just as impactfully as cumming in her not long before.
"Your lips are soft," I told her.
Nova had the grace to blush and turn her head slightly away. "Shut up."
"Let me try again," I said.
"Are you going to say another weird thing after?" she asked.
"Well, you know, you need some stuff for that notebook of yours, don't you?" I said.
You think like I don't have hours of notes to try and remember as is?" Nova snorted.
"Well a few more won't hurt anything then," I said.
I tilted her unresisting head back to me so I could kiss her again. It was just as wonderful the second time, and significantly less intimidating, which was nice. By the third kiss everything about it felt smooth and natural.
"I love you, you know," I told Nova.
"Well that's really gonna throw off my data," she said.
"Shut uppp!" I said.
"Kidding! Kidding." Nova bit my lip affectionately. "I love you too. Of course I do. More than usual, even."
We were still exchanging kisses and soft murmurs when Skye and Aurora returned.
"Haven't moved, huh?" Skye said.
"Told ya," Aurora said. "This is just gonna be weird now, isn't it?"
"Weird? Nah," Skye said, hopping back onto her edge of the bed. "Well, kinda weird I guess. But fun."
She emphasized her point by slipping her panties off and masturbating next to Nova and me, still wearing my shirt as she did so.
Aurora was slower to join in, but essentially did the same thing, except for leaving her panties on.
"Well that's gonna make me horny again," I said.
Nova traced my neck with her fingers. "I never stopped being horny."
"Ah. Well then... wanna, like, do it again?"
"Sex?" she asked, eyes gleaming.
"Yeah, sex," I said, matching her mischievous glint.
"I could go for some more," Nova said.
We'd hardly moved, so slipping back inside her took a minimum of effort. Nova made a happy little sigh and clutched at my butt, even digging her fingernails in, urging me deep into her messy pussy.
"I'm gonna get an incest kink at this rate," Skye muttered. "All this time thinking all that step-sister porn online was just silly."
"There's something to it though, isn't there?" Aurora said, finally giving in and removing her panties as well.
"Hehe, we're way ahead of you both," Nova said. "It is pretty hot, actually. Right, big brother?"
I dipped my head and gently closed my teeth on my sister's nipple. She gasped loudly.
"I know you're just trying to distract me," Nova said. "But... do that again. A little harder."
"Fuck me that's hot," Skye hissed, eyes wide and intent on us.
Aurora, at a more basic and feral level of arousal, moaned and whimpered her way through what I was pretty sure was an orgasm, agreeing with Skye's assessment in her own way.
I made my sister cum too with loving thrusts inside her, some tactical nipple biting, and the occasional carefully selected words whispered sensually to her.
"I love you," I told her.
"Mmm, I know," she purred.
"I want you to cum for me," I said.
"Unf. Ok," Nova said.
"Cum for your brother, ok? Like a good little sister. Such a good sis-ter."
She was so close and whining, and nipping at her nipples again sent her over, cumming on my cock and mewling into my shoulder.
"Absolutely ridiculous, the both of you," Skye panted. Though she came pretty quickly after that too, so I wasn't sure it was actually a chastisement of any kind.
"I'm a good sister," Nova said. "I came for you."
"Yeah you did," I agreed.
"You know what I need now?" she asked.
"My cum?" I suggested.
"Yesss," Nova said. "My brother's cum in me. Again. Even more of it. You want your baby sis-ter to be happy, don't you? Like a good big bro-ther?"
I was done for when she started talking like that and she knew it. I couldn't resist her saying those things any more than she could resist them from me. I came in Nova's accommodating little pussy for the second time in a row, and indeed the second time ever. She cooed and petted me like I'd done a really great job, rather than merely surrendering to the sexy inevitable.
Nova and I cuddled for a while, then all four of us headed back out of the bedroom to rehydrate and laze around some more. Nova and I stayed naked, and Skye joined in at some point after some joking around about her 'modesty.' Aurora kept my shirt on, but didn't replace her underwear.
We put another movie on, not that anyone was particularly invested in it. I spent most of my time cuddled with one of the girls or another, sometimes more than one of them at once.
Nova would frequently break away with Skye or Aurora to have some sneaky chats. I didn't try to listen in mostly, though I did catch Skye sticking her fingers up Nova's vagina at one point at was particularly interested in what that was about.
"Just... seeing what it feels like," Nova told me when she caught me looking. She grinned at my expression.
"That's gotta feel weird," Skye said. "Feels like a lot in there."
"It's weird," Nova confirmed. "But nice. Really nice. And sexy. And a reminder of like... stuff."
"Sex with your brother?" Skye teased, finally sliding her fingers back out and examining the cum clinging to them.
"Yeah, that," Nova said.
To my mild surprise, Aurora slipped out of my loose embrace and padded over to have a feel up my sister as well. Skye traded with her and snuggled up nakedly with me, still toying with my cum on her fingers.
"Are you... gonna leave all that in there?" Aurora asked Nova, finger-deep in her cooch.
Nova looked straight at me, devilish gleam in her eye. "Of course I am."
"It's kind of risky, isn't it?" Aurora asked, finally pulling her fingers back out. "All that cum?"
"If Sol knocked me up, it's kinda late to worry about it now," Nova shrugged.
I rolled my eyes and off-handedly tossed a cushion at my sister. "You're too clever for that to have been a risk."
"Well yeah, duh," Nova giggled. "But you could have at least gotten panicked for a second there." She fluttered her eyelashes. "Or maybe enjoyed the idea of breeding your baby sis."
I shook my head, but Skye betrayed me.
"His cock twitched a little just then," Skye laughed.
"Goddammit," I growled.
Nova sweetly kissed my cheek. "Knew it," she gloated.
"You did not," I said.
"Well... I know it now," Nova said.
She retrieved her notebook and assumed her place of honour next to me, with my arm around her and my hand on her warm tummy. She spent a while jotting things down--longer even than usual for her, though I supposed there was a lot to cover in this instance.
"Do I get to read any notes this time?" I asked.
"Absolutely not," Nova replied promptly. "They aren't for you."
Rather unfairly, she did let her friends peek at her writing a few times, and she collaborated with them on a few occasions as far as matching or clarifying some of the experiences of the day. Nova was just a bit smug about being the only one to know what it felt like having me inside her and getting cummed in though.
"What do you even need to record at this point?" I asked Nova. "I feel like you've got me pretty well figured out already."
"Because we had sex?" Nova asked.
"Mostly, yeah," I said.
"Do you feel like you have me all figured out now?"
I hesitated. "Not really, no."
"There you go then."
Our eventual bedtime was, unsurprisingly, a cramped affair as all four of us crowded into Nova's bed. Nova cuddled tightly up to me, of course, and Skye and Aurora found room beside us. No one mentioned it being an odd way to sleep, though there was a fair amount of shifting and grumbling as we all tried to get comfortable.
I didn't think I'd be in the business of getting any sleep that night, and I didn't even mind that much. I was sensually cozy to a degree I hadn't ever known before very, very recently in my life. Too warm, perhaps, with four bodies sharing the bed, but also soft and comforting being enveloped by nude or mostly-naked girls from all sides.
I must have fallen asleep at some point, despite my skepticism. The next thing I knew, I was gently being disturbed awake again. I flickered my eyes open just in time to watch Nova sliding my cock into her pussy while she straddled me.
"Unf, Nov, goddamn," I whispered.
"Sorry," she said. "I woke up and... couldn't sleep."
"So nothing to do with you being curious what it was like riding me while I'm asleep?"
Nova shrugged. "Maybe a little bit about that."
She rocked her hips ever so gently, but still enough to coerce a soft moan from me. She felt absolutely wonderful around my cock once again.
Aurora, having joined the rest of us in pure nudity at some point, probably because of how warm it was, stirred slightly. She was rather cutely clutching one of my arms, and in fact had snugged between her tits.
"Don't you two ever stop?" she murmured. "I was sleeping."
"So was I," I said. "Nov can't resist me though. What can ya do?"
Aurora nodded gently. "She's very horny. And she likes you."
"Yes," I said, watching my sister undulating atop me. "I think I might like her too."
Nova remained unperturbed. "Say it right. Tell me you love me."
I thought about teasing her, but her pace subtly quickened and I found myself wanting to please her.
"I love you, Nov."
"Mmm, good," she hissed.
"You're an amazing sister," I said as she rode my cock in the middle of the night right beside her slumbering friends. "I love you so much."
Nova nodded, reaching down to rub her clit while rocking on my cock. "More. Please?"
"You're the best baby sis-ter I could have ever hoped for," I said. "Actually, more than I ever would have hoped. I would never have dreamed of this, but I love it, and I love you."
Nova whimpered adorably.
"We're going to have so much sex," I said. "I want to make you cum as often as you need. You want to cum all the time for your big bro-ther, right? Like a good little sister?"
She panted, rubbing herself frantically. "Yesss."
Nova made herself cum on my dick with my frequent and naughty assistance. She rather considerately made sure that I came inside her again too before lying down atop me and going back to sleep. Once again drained, I pretty quickly returned to sleep as well.
****
The next morning was an incredibly lazy affair. We were all slow to stir and rise. I rather helplessly was the last to ever get out of bed, since even though the girls sleepily padded off to the bathroom and back, or to grab some water bottles, or whatever else, there was always at least one of them clinging to me, or atop me, or otherwise preventing me from going anywhere.
It was the absolute cuddliest and most wonderful captivity of all time, but my poor body could only take so much.
"You have to let me up soon or I'm going to piss the bed," I finally warned.
Aurora, currently most in the danger zone for such a threat, made a cute, alarmed noise and darted back away from me. Nova treated the threat less seriously, but on her own could be easily wrestled onto her back so that I could hop away and make my escape to the bathroom.
My dash for freedom got everyone up and about at last. We were all hungry enough by then for it to win out over continued sloth. At least sort of.
Breakfast was mixed preferences for toast or cereal. The very easiest options.
The dress code remained incredibly lax throughout. I put my pyjama pants on again, certain they wouldn't last long and that there was no point at all in dressing up any more than that. Nova wore yet another of my shirts and very obviously no panties underneath. She played a game of flashing her pussy or bum at me at almost every chance she had, delighting in her own lack of subtlety.
Skye was a bit less provocative than my sister this morning, albeit not by much. She'd donned her own shirt and panties, which was a pretty cute and sexy look too, if not quite as slutty as Nova's.
Aurora opted for actual modesty, dressing herself properly again in her own shirt and shorts. It was a tight and revealing outfit, but one that was very presentable in public.
We all hung out for a while in our various states of dress or undress. It was nice just to chill and goof around without it being particularly sexual. Though I wasn't at all bothered or surprised when the girls huddled up to whisper and giggle to each other, followed by Skye dropping to her knees in front of me and pulling out my cock.
"Probably gotta get going soon," Skye said, already running her fingers over my soft but twitching penis. "But... one more before then?"
I nodded assent, and Skye engulfed me, getting me hard with her mouth. She seemed to enjoy toying with me like that and feeling me get bigger on her lips and tongue.
I had just settled in for a casual blowjob in front of two amused witnesses--the sort of thing my life now entailed--when Aurora approached as well.
"Big brother?" she said, making me groan softly. Aurora still seemed shyer than Nova and Skye, but I felt like the gap had closed at least in certain specific ways. "Would you maybe eat my pussy for me?"
"Yeah," I said. "I might do that."
"Thanks, bro," Aurora said, already pulling her shorts back off again.
I glanced at Nova. "You're a very bad influence, you know."
Nova batted her eyes at me. "But you like it though."
"I didn't say I didn't," I said.
"You'd be lying if you did," Skye grinned. "I can feel what your cock does every time Aurora calls you her brother and asks you for something naughty."
Aurora, now bottomless, nodded eagerly. "I've been a good sister. I need my pussy licked." She said the words fairly confidently, though also blushed profusely.
Skye laughed. "Yeah, lick your sis-ter out, would you? We have been good girls, you know."
"I don't see how you have so much time to talk when your mouth should be full," I told Skye.
Her eyes flashed in amusement and horniness, and she stuffed her mouth full of my cock again.
After some negotiating of logistics, I ended up lying on the floor with Skye between my legs still sucking on me, and Aurora sitting primly on my face so I could lick out her sweet little pussy. I caught Nova lightly playing with herself while watching, though once Aurora had settled on my tongue I couldn't see much else.
My focus was all over the place, between trying to lick Aurora nicely and Skye's constant distraction on my dick. All the while part of my brain wondering what Nova thought about the situation. I didn't actually think my sister had put them up to this. I was pretty sure Skye and Aurora really just wanted a last bit of fun before they left.
I made sure to give them what they wanted as best I could. I knew my tongue-work wasn't at its best, from the angle and constant distraction of Skye's mouth, but I still made Aurora cum. Me cumming for Skye was far more inevitable. Both girls had cheeky, self-satisfied smiles afterward.
After dressing, Skye and Aurora said their farewells, which included some big hugs for me, and even a kiss on the cheek from Aurora.
"Thanks for... all that," Aurora whispered. "I get why Nov likes having you as a big brother."
"Come on, Aurora," Skye said, tugging at her friend. "I'll drive you home." She winked at me. "We'll come back and play sometime though, yeah?"
I sighed happily. "Hope so. That was fun this weekend."
Skye glanced at my cock. "Yeah it was. I've got some other ideas for next time too."
Aurora laughed. "Stop being horny. You've got to drive me home, remember? My parents'll be annoyed if I miss church."
"Yeah yeah, we're going," Skye said.
I blinked as I watched them hit Skye's car and pull out of the driveway.
"There's something mildly incongruent about Aurora concerning herself with church after... you know, everything," I said.
"Bet you like that," Nova teased. "Corrupting the poor innocent church-girl."
"That's on you, not me," I said. "But also... yeah, a little."
"Hehe, predictable."
Nova maneuvered me to the back deck where we could sit on the patio swing together, cuddled up in almost cute and platonic sibling manner, if not for my nudity and her lewdly splayed legs showing off her lack of panties.
We just cuddled though. Nothing sexual for the time being. It was nice.
"It's actually really nice that Aurora had a chance to open up like that," Nova remarked, opening up her notebook and staring thoughtfully at it. "She hasn't had much chance to date or anything."
I gazed curiously at my sister. "I don't remember you dating much either."
"Well no, but for different reasons," Nova said. "Not overprotective parents in my case."
"Certainly not," I agreed. Our mom and dad were pretty good about letting us make our own decisions. Not that they'd necessarily be thrilled knowing about what we'd been up to recently. "So out of curiousity, Aurora's parents must have thought it was just the three of you having a sleepover?"
Nova smirked. "Actually... they were happy to know you'd be around. To keep any sneaky boys away."
I shook my head and slipped my hand under Nova's shirt, letting it rest on her tummy just under her breasts.
"You like that, don't you?" I said.
"What, that my friends' parents think you're a good and safe boy, when actually you've been devious and sinful?" Nova chirped. "Yeah, might be some fun in that."
"Were you going to tell me about that part?" I asked.
"If it seemed amusing, sure," Nova said.
"You're something else," I told her.
"Thanks, probably." Nova shifted a bit and rested her head against me, then jotted a few quick notes for herself.
"I'm glad all three of you had fun this weekend," I said. "That I can be someone both safe and devious enough."
"Hehe, yeah. And I bet that's so very altruistic of you, huh?" Nova teased.
"It's at least a little altruistic," I pouted. "And only mostly self-serving."
"'Cause you liiike having three horny girls all over you," Nova said.
"Well... yeah." I kissed the top of her head. "Don't tell them, but you're my favourite."
"Well yeah," Nova giggled. "I put out."
"Oh my god. I mean... yes. But not really because of that. Although... fuck, Nov. That was incredible, wasn't it?"
"Mmm," she purred. "I was very happy about having sex with you. And I'm glad I did it with Skye and Aurora around. It was... intimidating. I know it doesn't need to be, especially now that I've experienced exactly what it feels like, but it was."
"I get it," I said. "It held... emotional weight."
"Ooh, yeah, good point," Nova said, scribbling rapidly. "That's a very good way to put it. I'll have to remember that for..."
"For what?" I asked.
"Well... if Skye or Aurora decide maybe they want to try sex too," Nova said. "I think they might."
"Unf. You'd just let them?" I asked. "With me?"
"Well yeah, probably," Nova said. "I don't think you'd mind."
"That wasn't my concern," I said. "Because you're right, I wouldn't." I teased her breast a little with my fingers. "I just feel like at some point you'd have to get jealous. I just don't know where the line is. Or even if there is one."
"Jealous?" Nova asked.
"Yeah, you know. Like if you share me too much with your friends, that like what if I stopped wanting you as much. Or something like that."
Nova went still and quiet.
I panicked a little. "Um... not that you need to worry about--"
"Shh!" Nova said.
"But--"
"I need to think for a second!"
It would be rather embarrassing of me to fuck up like this, I reflected while staying silent. After everything, to get caught up on the threat that I'd leave Nova for one of her friends. Which I absolutely wouldn't. I hoped she knew that. I was only marveling at her lack of jealousy.
But I didn't really think that Nova was incapable of jealousy. Only that she might not have felt it needed until I brought it up.
Nova finally stirred, flipping calmly to a new page of her notebook and writing slowly and carefully.
"I didn't think of that," she said in a low voice.
"Well like I was trying to say, it's not something that would happen," I said, hoping to salvage this still.
"No, I know," Nova said. "Probably why it didn't occur to me. But like... it should have. I spent so much time obsessing over making sure you'd be interested and stay interested, I didn't consider that I might actually lose you to someone else."
I--"
"It was negligent on my part," Nova said. "I see how some of these experiments have been dangerous for me." She perked up a little. "The good news being that disaster did not in fact strike. I've seen you with Skye and Aurora. Very intimately in fact. And I don't need to worry."
I breathed a sigh of relief. "You don't," I assured her. "They're fun and I'm glad we could all enjoy ourselves, but they're not you."
"Because you love me," Nova said, making it halfway between a firm statement and a leading question.
"I love you," I said with no hesitation. "And this thing you said about making sure I stayed interested? Nov, you don't have to do anything crazy. We don't need fourways with your friends."
"Although?" she prompted.
"Although I'd like to have them around again," I admitted. "And... you're very good to me and probably the best sister ever."
"Correct," she said, snuggling even more cozily up to me. "You're a good brother. I'll probably even let you have sex with me again."
"Let me?" I asked, pinching her nipple sharply.
Nova gasped, then laughed. "Ok, ok. I want it more. Lots more. Ok?'
"Yeah, Nov. Very ok. I'd have to be heartbroken otherwise."
She tried to give me a teasing smile, but it ended up coming out fully genuine. "Heartbroken, huh?"
"Sad and horny at the very least," I said.
Nova giggled. "You would be, too. I liked heartbroken better though. Stick with that."
"Not very scientific of you trying to force the results," I pointed out.
"Technically true," Nova said, closing her notebook and closing her eyes while she leaned on me. "But I think there's a chance--just a chance mind you--that I've become too personally invested for this to be any kind of objective experimentation anymore anyway."
"Ha, ya think?" I snorted. "You couldn't be any more personally invested."
Nova chuckled softly. "You're right. And yet... I still want to keep going. I still want to learn."
"Yeah, I do too," I said. "I think that's normal to want to learn what you like. Even beyond the alleged scientific research of it all."
"Alleged?" Nova demanded, sounding perturbed.
"You heard me," I grinned.
She bit me rather sharply on the shoulder, making me gasp.
"This is all valuable, thank you very much," Nova said, tapping her notebook.
"Uh huh."
"You're lucky I'm so dedicated, really," she insisted.
"I am lucky," I agreed, implicitly declining the latter half of her statement.
Nova tried to sulk a bit and focus on her notes, opening them up to some further additions while we cuddled in the sun. I was as much distraction as I could possibly be, roaming with my hand or occasionally my lips. Nova laughed despite herself, and kept squirming to try and prevent me from caressing a sensitive spot, but she had lots to choose from.
When I started nibbling at her neck, she was done for, and finally had to give up on pretending to take notes.
"You're so needy sometimes," Nova chided, climbing nimbly into my lap.
"Is that what I am?" I asked.
She wrapped her arms loosely behind my neck, gazing intently at me. "Yes. You can't leave me alone."
"Nov, you're sitting there mostly naked and pressed sluttily up against me. If you wanted any peace, that was not the way to get it."
"Sluttily? Me?" she said.
I ran my hands under her shirt, up her warm flanks to her breasts, and then down to her tantalizing bare ass.
"Just a touch, yeah," I said.
Nova wasn't shy about grabbing my cock and making sure it was hard and ready for her. "Guess if I'm slutty this morning... there's only one thing for it."
"A cold shower?" I hazarded.
"No."
"Asking Aurora about joining that church of hers?"
"No!"
"Trying to--"
Nova put a finger to my lips. "Think very carefully about this next oh-so-hilarious suggestion of yours."
"... sex?" I offered carefully. "Sex for you with your bro-ther?"
Nova sighed contentedly and lowered her pussy onto my hard cock. "Much better."
"You know that's all I'm going to want anymore," I told her.
"Yeah," she said, biting my lip and rocking her hips. "I figured. Lucky for you, I might want to experiment with trying to get you to cum in me every day now."
"Just the once?"
Nova made a horny noise in her throat and rode me harder. "At least once. Let's say that."
I nodded. "Agreed. I can make that sacrifice. For science."
"How noble."
"That's me."
I removed my sister's shirt, hardly slowing her rhythm at all. I enjoyed having full access to her nude body outside in the warm, sensuous sun. I felt her up and kissed her, everywhere from her lips down to her tits. When I wanted to get her hornier and riding me faster, I started sprinkling in little bites here and there, just to rev her up.
"Fuck, Sol, you know what that does to me," she panted.
"I do," I confirmed.
"You're gonna make me cummm!"
"That's what I want," I told my sweet, sexually charged baby sister while she rode my cock needily. "I want you to cum for me. Like a good girl. Like a very good little sis-ter."
"I want you to cum in me," she panted.
"Mmm, that too," I said. "You cum for me, then I'll cum in you and you'll have to walk around with your brother's cum in you all day, ok?"
Nova giggled softly and whimpered her assent. I rubbed her clit and bit her neck while she whined at an increasingly desperate pitch before cumming on my cock just the way I wanted her to.
Thus sated, at least in part, Nova took back some control. She got the motion of her hips under more control, looked at me with narrow, wickedly gleaming eyes, and gave me the kind of smirk that could make me melt into her.
"Your turn," she said huskily.
I nodded. "Yeah."
"'Cause I need you to cum in me," Nova continued conversationally. "You promised."
I groaned softly. "I will."
"I know. Because you're a good big brother, aren't you?" Nova purred. "You're going to be a good boy and cum in your sis-ter's pussy." She laughed gently. "Well, maybe that's kind of bad of you, actually. You're a bad boy sometimes. But... still a very good brother."
"Novvv..."
She stroked my hair and nibbled on my ear. "You like that, don't you? You want to cum in me. In your little sister's pussy that's just waiting for it."
"I dooo," I said.
"Do it," she urged. "Good boy. Like that. Yesss."
I held Nova tight, clutched at her really, and came so deep in her pussy, filling her the way she wanted. She mewled and nipped at my shoulder, then went back to purring and stroking my hair and calling me variations of a good boy.
We held each other after, naked and sweaty and so very satisfied out in the sunlight of the back yard.
"I love you," I said.
"Love you," Nova echoed easily.
She hummed happily to herself and didn't get off my lap until my softened cock finally slipped out of her. Even then, she took her sweet time about it.
"So... we both really like when you cum in me," Nova said, flipping her notebook open and nestling comfortably against me again.
"You really need to make note of that?" I laughed.
"It's relevant," she said.
"I think we'll remember," I said.
"Probably," Nova said. "But I'm going to write it down anyway."
"I know," I said.
"And I really liked doing it outside like this," she added.
"Mmm."
"There's lots of places we can try," she said. "You know, just to experiment."
"How very scientific of you," I said, mind already considering possibilities.
"Thank you," she said. "Now... how long before you think you can go again?"
I laughed and hugged Nova to me, tickling her a bit to distract her from her questions. I didn't really have an answer. It would happen when it happened.
That was about all we got done all day afterward, waiting for us both to be in the mood again and fucking somewhere new. Not making for a productive day exactly, but an extremely fun and memorable one for sure. Cementing our new connection beyond any kind of doubt.
****
Nova and I were already obsessed with each other. That hadn't diminished even a little since we started having sex. If anything, we became even more inseparable than before. Clingy, even.
It made sense. First person we each had sex with, first person we each fell for, and the omnipresent fact of our sibling relationship firmly in the mix.
"So here's the thing," Nova told me one day while she was stretched nakedly out on my bed.
"That sounded dangerous," I remarked, running my fingers up and down her back. Her smooth, bare back that I found myself entranced by once again. My little sister was endlessly fascinating, physically and otherwise.
"You remember how I mentioned about wanting to make sure I had new and sexy plans to make sure you stayed interested in me?" Nova asked.
"I recall something of the sort, yes," I said.
"I really do believe I was overthinking things," Nova said.
"You were," I said. "But I mean... make notes of those ideas anyway. Just in case."
Nova giggled. "You horny thing. You cummed in me three times already today."
"So what, you think I'm done with you?"
"Nah," she said, flipping through her notebook. "I haven't recalculated the stats, but I believe the average lately is slightly higher than four times a day."
"Damn, I'm impressive," I said.
"You're horny," Nova corrected. "And enamoured with me."
The latter was stated nearly as a question.
"I am," I confirmed, just in case she was fishing. I found it cute when Nova looked for reassurance. I would have thought she'd know my intentions well enough by now. "Absolutely smitten."
"Good boy," she said, making a tick in her book.
"Nov?" I asked.
"Hm?"
"You aren't counting how much praise you give me each day and determining the optimal outputs, are you?"
"... no?"
I smacked her butt, making her yelp and glare at me.
"Bad girl," I told her.
"Am not! I'm increasing efficiencies," she said.
"I don't need trained like a puppy," I said.
She chewed her lip.
"I don't!" I insisted.
"I mean... it kind of works though," Nova said. "Praise and treats go a long way with you."
I flipped her on her back, biting one of her nipples in rebuke. She only liked it though, and I alternated between nipping at each of her tits until we were both horny and ready to go again, and I slipped into my sister's welcoming little pussy.
"See how well that works?" Nova purred.
"That wasn't praise or treats," I said.
"You made the mistake of thinking those were the only tools I was using," Nova teased, eyes gleaming.
"I can't tell if I love how scientifically minded you are about all this," I said, "or if I hate it."
"Little of both works surprisingly well," Nova said. She nipped at my ear. "Fuck me good, big brother? I need it."
I did fuck her good. I was learning so much about exactly what she liked and what got us both off. I maintained that the way I learned was better and less clinical than her extensive note taking, but honestly both approaches seemed to work and led to us having an amazing time.
Nova held me close after we'd both finished. We were pretty cuddly anyway, but sometimes she needed more than usual.
"So like I was saying," she said after a time.
"Yes?"
"Originally it was intended as benefits all round. Getting Skye and Aurora involved." Nova shrugged. "I don't think I need their help with you necessarily. Not anymore."
"You don't," I said. "You've got it figured out."
"Mmhm. But the thing is... they keep bugging me about you. About sharing some more."
"Oh?" I said.
"Hehe, I felt you twitch," Nova said. "You're so predictable."
"Be nice," I said. "And... go on?"
"You like having them interested, don't you?" Nova teased.
"Well... yeah. It feels nice. Are they really bugging you about me though?"
Nova shrugged. "To be fair, I encourage it. I wanted to make sure they were interested for when I needed help. Which I don't anymore. But... we kind of had this plan to all be able to try some stuff out, and I think they're still hoping for that."
"You mean..."
"Sex," Nova said. "They've liked getting licked out. Or playing with your cock. But sex is kind of the scary step to take."
"It doesn't have to be," I said.
"No, exactly," Nova said with some amusement. "With the right person, the right circumstances..."
"It's very flattering to be the right person," I said.
"Mmm, I'm sure," Nova said. "Here's the question, are you going to get too smug and unmanageable if you help out Skye and Aurora like you did me?"
I was hardening again, and Nova could most definitely feel it. "Me?" I asked. "Smug? Unmanageable?"
"So yes, then," Nova giggled. "That's ok, I think. I like when you're more confident anyway. Makes you more fun in bed."
I slipped back inside my sister, fucking her so very slowly and gently. I didn't need anything more than that right now, but just being in her felt really nice.
"How are you going to feel if I'm your friends' first times too though?" I asked. "That's not going to bother you?"
"I... don't think so," Nova said. "I'm curious how I'll feel about it. I think it would have bothered me if it had been one of them before me. But I'll always know I had you first."
"It might still bother you anyway," I said. "I think I'd be bothered if you fucked any of my friends."
"Hehe, so territorial," Nova laughed. "I can see that. You're a jealous brother, huh?"
"And you're not jealous at all?"
"Hm, there's some there," she admitted. "If you went and started dating someone, there'd be hell to pay."
"Noted," I said.
"But... this isn't any of your idea," Nova said. "It's different. It was my plans, and I could cancel them if I wanted to. I'd like to share with my friends. Feels like the nice thing to do. Get them some experience too after they helped me out."
"Share me, huh?" I said.
"Yeah. At least once," Nova said. "Maybe more than that, depending on how it goes."
"And you really don't think you'll mind at all?" I asked.
Nova thought about it. "I might," she finally decided. "A bit. Which will be good information to have if that's the case. Might be a good thing to test under controlled circumstances actually."
"Nov, these are your feelings. Not just scientific curiousity."
"It can be both." She nipped at my shoulder. "Plus it could benefit me just being able to observe sometimes from the outside. I've already found that to be helpful even with just messing around."
"Is that so?" I asked. "Nothing to do with you enjoying it?"
"Ah! Well maybe," Nova admitted. "Maybe I like it some. Especially when I know that really you're all mine and I get you whenever I want."
"That's true," I said. "And... I'm not opposed to the idea of sharing."
Nova whispered in my ear. "Oh? You don't mind having three pussies to cum in instead of one? You don't mind being three girls' first times? You don't mind having three horny little sisters to play with? You--"
I groaned, shut her up with a deep kiss, and came inside her again.
"You don't... play fair..." I panted.
"And I will never claim to," she said happily. "So we'll give it a try?"
"Yeah, Nov, let's try it."
****
It didn't actually happen right away. Skye and Aurora came over a few times, and we got up to plenty of naughtiness, but it took some build up before we took it further than before.
I in fact had my face buried in Skye's cooch when she made the request. She only had a tank top on by that point, and looked at me with eyes that were a particular mix of adoring and calculating. Not unlike the way Nova often watched me.
"Hey, big brother?" Skye said softly.
I knew something was coming. The girls all rather enjoyed that they could get almost anything they wanted from me when they talked like that to me. Nova, the little imp, encouraged it. She found it funny, and possibly even hotter than I did.
"Would you want to... have sex with me?" Skye asked, just a touch tentatively.
I glanced at Nova for confirmation. She was mostly naked. The dress code when we all hung out was non-existent by this point, and full or partial nudity more common than modesty. Nova gave me nothing but a subtle, cheeky smile.
"Yes," I told Skye, looking straight back into her eyes.
She flushed and glanced slightly away. "Really?"
"Yeah. Of course," I said.
Skye teased my hair. "It would be my first time doing that."
"I--"
"Yeah, Sol likes taking sisters' virginities," Nova remarked casually. "Bit of a bad boy that way."
I rolled my eyes at Nova, who gave me a beaming smile in return.
Skye saved us from our stare-down. "I really like the idea of having someone safe to try it with," she said. "Obviously you're not really my brother, but... the way you were so good for Nova feels really nice. And I like that maybe you are kind of my brother, in a weird sort of way."
"Maybe like an informal step-brother," Aurora supplied helpfully.
"Yeah, like that maybe," Skye said.
I looked around between the three girls: Skye in her tank top, Nova only in some rather damp and sexy panties, and Aurora in one of my shirts and a skimpy pair of panties of her own. Nova had previously been wearing that shirt, and Aurora had taken ownership while I'd been sucking and nibbling on my sister's tits earlier. It was amazing I ever had any clean shirts available anymore between the three of them always stealing my stuff.
I did love it though. It really was like having three sister-fuckbuddy combos around.
Or... whatever Nova was. More than a fuckbuddy, that was for sure. Not a girlfriend exactly. Something.
"Chosen siblings," I decided. "At least for sexual purposes."
Skye laughed insanely. "That's the most ridiculous way to put that!"
"Am I wrong?" I teased.
She bit her lip. "No."
I picked her up off the couch and led her to my room, Nova and Aurora in tow. We got fully naked and tumbled into my bed together. Skye's eyes were shining, and she panted softly even before we'd really done anything. To be fair, we'd essentially been engaging in foreplay all afternoon already, and her pussy was freshly warm and dripping from my tongue-play.
"My brother," Skye tried out. "My big brother. For sexual purposes only." She giggled. "Is it bad that I like that?"
Nova bounced into bed next to us and already had her notebook flipping. "The incest angle's really been working for everyone, as far as turn-ons. It gets Sol going, and makes him cum faster and harder. I would say you're not alone."
"Are we just ignoring how much you love it?" I asked Nova lightly.
She had the grace to blush, if only softly. "You've got work to do, bro," Nova chided. "Don't be looking at me right now."
She was right. Skye was right there, naked and ready for me. Wanting me. While Nova, in surreal fashion, was perfectly content to share me that way.
I somewhat awkwardly positioned myself atop Skye. I had a better sense of what I was doing thanks to all the sex Nova and I had been having, but Skye was a different person, and I wasn't quite sure what emotional things would be going on for her, let alone whether she physically reacted exactly the same as Nova or not.
I was quick to realize I was overthinking things. Skye gasped contentedly as I sank into her and happily encouraged me to thrust into her wet little pussy over and over. She clutched at me, grabbed my hair, dug her nails into my back, and murmured occasional words to me, some of which I even understood.
Nova was observing closely, pen twirling idly in her fingers in between occasional notes. Aurora had slipped her panties off to play with herself.
At some point Skye let go of me and reached out to her friends. Nova set her notes aside to hold Skye's hand, while Aurora switched hands she was rubbing herself with so she could do the same. Sharing the moment and offering reassurance and comfort to each other