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Thanks to Shihoko, they started calling each other by their first names, and Mahiru's attitude clearly changed.
She now wears a gentle smile more often and talks more.
Similarly, Amane also began to become less reserved and overly considerate towards Mahiru.
In the end, I decided to leave the key I had left to Mahiru.
At first Mahiru was confused, but gradually she began to enter normally.
On some days, Mahiru would come home from school first and be in his room before Amane.
This was one of those days.
"I'm back... has Mahiru arrived already?"
I just remembered that I had run out of shampoo, so I bought some at the convenience store on my way home from school, so it seems that Mahiru was earlier.
Mahiru's tiny shoes were lined up neatly in the entranceway.
"I'll just put the shampoo in the bathroom first."
Before entering the room, open the door to the dressing room.
For some reason, Mahiru was standing there, naked except for her underwear.
"...Huh!?"
"Ah, Amane-kun?!"
"Sorry. I didn't realize you were changing..."
"Well, I was trying to prepare rice, but I accidentally spilled the water in the pot..."
"Are you okay? Did you get any injuries or burns?"
"Y-Yes. It was before I put it on fire, so there were no injuries or burns, but... Umm, Amane-kun?"
"What?"
"...How long do you intend to keep watching?"
Although the important places were covered with her hands, Amane still stared at the naked Mahiru and didn't leave.
"Since this is a rare opportunity, I might as well make sure to burn it into my memory."
"Oh come on, it's fine so just leave! Also, I'm sorry, but if you have anything to wear, could you please lend it to me? I need to get back to my room before I can get a change of clothes."
"Okay, okay."
For just a moment, the image of Mahiru's breasts, completely visible, burned into my mind as I left the changing room.
Tonight's snack had been decided.
"Mahiru, I'll leave your change of clothes here."
"Yes, thank you."
After a while, Mahiru came out of the dressing room wearing Amane's shirt.
There were men's pants lying around, but the shirt was so long that it looked like he wasn't wearing anything underneath.
"...Ahhh, you're naughty."
"That's too late now, right?"
Mahiru sat down next to me on the sofa. Even after something like that happened, it was typical of Mahiru to not distance herself from me.
"More importantly, I'm sorry that all I have are my underwear, but please don't use them to masturbate again, okay?"
"Uh, forget about that."
After feeling embarrassed for a while, Mahiru seems a little apologetic.
"Um... I'm sorry about that time. I took your underwear without permission... it was disgusting."
"No, it's fine though..."
I don't think they're gross, but after that, I hesitate to wear those pants again, even after Mahiru washed them thoroughly.
"So... I think if you do the same thing, it will be fair."
"Same thing?"
"Yes, so... Ah, Amane-kun, please masturbate with my underwear!"
Saying that, she unfolded the pants Mahiru had been wearing and held them out to me.
"...It's wet."
"That's because it got wet."
I ended up accepting Mahiru's pants. As expected, there was a stain in the center that wasn't water.
"Ah, do as you like, Amane-kun."
"S-as you like...?"
I swallowed hard. When I looked towards Mahiru, he was looking at Amane with a look of embarrassment and a hint of expectation.
"Mahiru, what did you do with my pants?"
I decided to ask Mahiru. Although she looked embarrassed, she answered honestly.
"Well, I was smelling it and pressing it against my crotch to get some pleasure..."
"Where is it between your legs? Tell me exactly."
"It's... my pussy."
I had a vague feeling that Mahiru had a bit of a masochistic streak.
Even though she is being forced to reveal something embarrassing, this only makes her more excited and her face begins to melt.
"I see"
First, just like Mahiru had done, I put the crotch part to my face and smelled it.
Maybe it's because they're high-quality pants, but they smell nice.
"Sniff sniff, sniff!"
"Ahh... hmmm."
Mahiru's body twitches as she watches. She must have felt as if someone was sniffing her vagina directly.
Mahiru purposely exaggerated her breathing, and eventually she was no longer able to stand, so she collapsed onto the sofa with a thud.
"And then, this is what you do."
"Ah... it's already getting bigger."
He pulls down his pants and his dick pops out. His excitement is already at its peak.
He puts Mahiru's underwear over his dick and starts jerking it off with all his might, as if to show off.
"Ha, ha, ha."
"Ohhh... so strong..."
It wasn't the first time that Mahiru had seen Amane masturbating. Recently, they had been masturbating almost every day, using each other as their stimulants.
Still, when he saw Amane moving his hands as if he was violating his pants, he fell into the illusion that he was being violated.
As Amane's hand went up and down, Mahiru's body twitched in response.
"Ha, ha, phew."
"Mmmm, ahh, mmm..."
"Haa, Mahiru, can you join us too?"
"...yes"
Mahiru readily agrees to Amane's proposal. Mahiru must have reached the limit of her patience as well.
White fingers pulled up Amane's shirt. Underneath were Amane's men's trunks.
The size is so loose that even the groin is exposed.
(Mahiru is wearing the same pants I usually wear...)
An indescribable excitement wells up inside her. Mahiru's fingers begin to stimulate the pussy deep inside her trunks.
"Ahhh, mmm, aahh!"
Amane and Mahiru's movements are synchronized. Mahiru also seems to be excited by the idea of being violated by Amane.
"Damn, Mahiru, Mahiru!"
"Amane-kun, Amane-kun!"
They called each other by name, and even without touching, it was clear that they both wanted each other.
"Mahiru, I'm about to come. Can you show me your breasts one last time?"
"Huh!?"
I was masturbating while remembering the scene I saw in the changing room earlier, but I would like to climax again while seeing it with my own eyes.
After thinking about it for a bit, Mahiru nodded in response and pulled her shirt up even further.
She wasn't wearing a bra, revealing her surprisingly ample breasts.
"oh"
I couldn't help but exclaim in excitement. I had caught a glimpse of it earlier, but seeing it closely like this made me feel a whole different level of emotion.
Her breasts were large, yet well-proportioned, considering her slender frame.
In the center, a beautiful pink nipple stands out, pointing out loud.
And her cheeks turn red in embarrassment when her breasts are seen.
All of them exuded sculptural beauty and eroticism.
"Mahiru, you're beautiful. And...very erotic."
"...Is it okay to just say, 'Thank you'?"
"That's the best compliment I can get. Thanks to you, I can't take it anymore!"
As if making a final push, he speeds up the movements of his hands up and down.
I was already on the verge of orgasm, and sexual fluids began to rise up from my testicles.
"Mahiru, I'm gonna come! Keep going like this, I'm gonna cum!"
"Haa, haa, yes, Amane-kun, please ejaculate lots of semen!"
"Uh, haaaah!"
I ejaculated with all my might into the center of Mahiru's pants. The largest amount of cum I've ever ejaculated stained Mahiru's pants, but it still couldn't be contained and overflowed.
"Haa, haaa... it was the best."
"That's good."
By the time Amane had calmed down, Mahiru had pulled down his shirt and was fidgeting embarrassedly.
"Mahiru, I'm sorry. I ended up asking you to show me your boobs."
"No... I guess you like women's breasts too, Amane-kun. I thought you weren't that interested in my body."
"That's not true. A beautiful girl like Mahiru, even though she's shy, shows off her breasts herself. There's no healthy high school boy who wouldn't like that."
"Beautiful girl... you idiot, Amane-kun."
"You're used to being told that. But seriously, I'm sorry, I got carried away."
"No, well... it feels good to be looked at by Amane-kun, it's not that I dislike it."
"I, I see."
Mahiru, her ears red, said something unbelievable.
"I know this is indecent, but... I get excited when Amaneu-kun looks at my body. Even though I'm embarrassed, I can't stop my body throbbing, wanting him to look at me more and more..."
Just watching seemed to keep Mahiru excited, even though she hadn't climaxed, and just as she was about to bring her hand to her crotch, she suddenly came to her senses and stood up as if to cover it up.
"S-sorry. The clothes should be out of the dryer by now, so I'll be heading home now."
"Ah, yeah."
Mahiru snatched her panties from Amane's hand and headed to the changing room.
After that, I quickly changed my clothes and went home.
"'I don't mind being watched', huh?" I knew she had become interested in erotic things, but honestly I didn't realize Mahiru's sexual desire was so strong.
To be honest, I had to restrain myself from reaching out many times.
Amane no longer had confidence that he could avoid hurting Mahiru any further.
--Mahiru's point of view--
"Haaah, haaah!"
After coming back from Amane's room, I headed straight to the bedroom.
In my hands were the pair of panties that Amane had given him back. They were also covered in semen that Amane had just ejaculated into.
Seeing something like this, my rationality crumbled in the face of my excited body.
As soon as I entered the room, I took a deep sniff of the semen-covered pants.
"Shh, haaaa! This is too naughty..." I took off the pantie that I had been wearing. If I kept going like this, I would end up masturbating in my pants again and soiling them. "Plus, today...Ahhh, he even saw my boobs."
Although it was an accident while I was changing, afterwards I ended up showing my breasts of my own volition, even though it was Amane who asked me to do so.
"And to think that you even told Amane-kun that it felt good..."
There was a struggle between the feeling of embarrassment and the pleasure that even that feeling turned into pleasure.
"That's right... if we do it like this"
It might feel good to wear pants covered in semen. That thought occurred to me in the middle of the day, and I didn't even think to stop it.
"Haa, Ahh! It's amazing, Amane-kun's semen is in my pussy...!"
I just put on my pants. But I had a slight orgasm.
"Haa, haa... My love juice and Amane's semen are mixed together... No, I'm feeling horny again..."
In the end, I continued masturbating until I climaxed four times.