Checking on everyone's position through the Reader's Viewpoint:
Saya and Saeko were sleeping in the bed in the front bedroom, while Kohta was still on lookout at the balcony.
Rei and Hisashi were still in the apartment next door, waiting for Hisashi to recover and get hard again so Rei could satisfy her lustful desire.
Karen, Imamura, Alice, and her mother were all asleep on the ground floor, with Mr. Maresato and Zeke looking after them.
Which meant no one was using the second bedroom on the second floor.
"What are you doing? Aren't we going to do it in the bathtub?" Shizuka said as Nach lifted her up in a bridal carry.
"I changed my mind. It would be uncomfortable in the bathtub, so let's continue on the bed instead," Nach replied before walking out of the bathroom.
Nach expected Shizuka to complain at first, considering they were both completely naked as they headed to the back bedroom. It wasn't that far—just a small hallway on the second floor—and there was no one who would see them, but only Nach was aware of that fact.
She was really open-minded, Nach thought. Or perhaps Shizuka was just excited and aroused to continue their intimacy.
---
Nach locked the door, walked toward the bed, and put Shizuka down. He then got on the bed and pinned her down.
His strong arms restrained her hands on the bed with their fingers intertwined, and his muscular body overlapped hers, pressing his entire weight onto her, telling Shizuka that Nach would surely dominate her in bed.
His aggressive, intimate, and passionate kiss told her that she would be completely eaten and devoured, starting with her lips.
And his throbbing, massive erection pressing hard against her entrance told her that she would be ravished far more than she had ever experienced.
All that stimulation made Shizuka tremble in anticipation, her body arching as she pressed her large, soft breasts harder against his body, positioning her soaking-wet entrance to let Nach know she was ready to begin.
"I won't hold back anymore and might get a bit rough, if that's okay with you?" Nach said after their lips parted.
"You can do anything you want, until you're satisfied," Shizuka replied.
With Shizuka's consent, Nach sat up between her legs, spreading them apart by gripping under her slender, thick thighs.
"Ahh… Ahh… Ahh~!"
Shizuka started moaning as Nach rubbed his massive erection against her soaking-wet entrance, making her feel its intense throbbing.
"AHH… AHH… AHH~!"
Her moans grew louder as he penetrated her—slowly yet intensely—making her feel every inch of his length as her walls were spread wide, until the tip of his head kissed the entrance of her womb and made her orgasm.
As her body trembled in pleasure, her breasts bouncing each time she twitched from the stimulation of her ongoing orgasm, Shizuka expected Nach to pull back and begin pounding her relentlessly.
Or so she thought.
"AHH~!"
Her loud moan filled the entire room and was surely overheard by everyone in the apartment. But that wasn't what concerned Shizuka. What her mind and body were focused on was how Nach could penetrate her even deeper than when they had done it in the shower.
Her womb was being pushed back, with his rod pressing hard against its entrance as if trying to penetrate it.
That stimulation alone immediately brought Shizuka to another orgasm.
"That tightness feels so good. You're even tighter than earlier in the bathroom," Nach said, feeling the stimulation of her orgasm with his entire length inside her.
He let go of her legs only to hold her hips as he slowly withdrew, feeling the sensation of her walls clinging to his shaft, refusing to let go.
Nach withdrawing didn't only give Shizuka more stimulation; it also told her what was coming next when he stopped pulling out, with the tip of his rod still inside her.
"Don't faint on me, Shizuka."
"AHH~!"
---
"How long have they been at it?" Saya grumbled, her face blushing red—both in embarrassment and annoyance—as she stood in front of the door outside the bedroom, where they could clearly hear the sounds of Nach and Shizuka's intimacy:
Shizuka's moaning, along with the flapping sounds and the creaking of the bed.
"Two or three hours, maybe," Kohta said, wiping his nosebleed with a handkerchief while his other hand awkwardly covered his pants, hiding an obvious stain.
"You don't have to be shy, Hirano-kun. You're a boy, after all," Saeko said, understanding what Kohta must have done, causing him to awkwardly look away. Even she couldn't hide her flustered face despite her sweet, gentle smile.
"That pervert isn't assaulting Shizuka-sensei, is he?" Saya asked, directing her question at Kohta.
"I don't think so… They started in the bathroom after Shizuka-sensei invited Nach-sensei to talk," Kohta added, trying to shift Saya's disgusted glare away from him.
"They're both adults, and they have each other's consent, so that shouldn't be a problem."
Hearing Saeko's remark only made Saya more annoyed. Still, a sudden idea came to her.
"On that note, aren't you also an adult, Busujima-senpai?" she said, hinting at more than what her question meant and successfully fishing out a completely flustered and embarrassed reaction from Saeko, her face turning red.
And Saeko wasn't the only one who shared the same expression and reaction upon comprehending what Saya said.
"So I'm sure that pervert would be willing to welcome you as well into his harem," Saya added, looking at Karen, who was standing by the stairs.
"But even if they're both adults and have each other's consent, at least pick a proper time and place, YOU PERVERTS!"
---
"Here comes the first load, Shizuka."
"AHH~!"
Her body stiffened, forming a beautiful arch as her breasts bounced softly from the trembling within her body while he poured his release inside her womb with intense pressure.
Her vision turned white and her mind went blank from the pleasure and stimulation of an intense orgasm she had already lost count of.
Shizuka was slowly fainting and losing consciousness, but when Nach pulled his still-erect rod out, it was as if her awareness was pulled back from the void as well, causing her to moan from the sensation of his thick, viscous, warm liquid overflowing from her womb, dripping out of her trembling entrance and soaking the bed.
"We aren't done yet, Shizuka."
If he did her again without giving her time to rest, Shizuka was sure she would faint right from the penetration. But that wasn't a problem, since it wasn't her entrance that Nach was going to penetrate.
"Your breasts are really large and soft," Nach said as he straddled Shizuka, groping her breasts with both hands and pressing them together before sliding his erect rod between them.
"But not large enough for you, Nach," Shizuka said as she raised her head and kissed the tip of his rod that emerged above her breasts.
Nach indulged himself in the pleasure of Shizuka's softness wrapped around his shaft, and of her lips and tongue as she gave the head of his rod a blowjob.
When Shizuka stopped and rested her head back on the pillow, Nach began pounding her relentlessly, taking a different kind of stimulation as his rod sank between her breasts until he was close to reaching his climax again.
Feeling the burning warmth and intense throbbing between her breasts resonating with her heartbeat, Shizuka opened her lips wide, begging Nach to let her have a taste of his release.
At that instant, Nach thrust his rod, its head slipping out on top of her breasts, prompting Shizuka to raise her head again and kiss the tip.
"You can have as much as you want, Shizuka," Nach said as he reached his climax and poured his release into her mouth.
Shizuka swallowed as much as she could, gulping and forcing down Nach's thick, viscous, warm release through her throat. But despite her efforts, his release kept filling her mouth and spilling past her lips.
The moment Nach poured out all of his accumulated load and had her suck what remained inside his shaft, Shizuka thought their intimacy would end.
Or so she thought.
"How come you're still hard, Nach?" Shizuka said as Nach turned her around to lie face down on the bed, ready to pleasure her from behind.
"But we only just started," Nach replied, thrusting his rod and penetrating her with his entire length.
"We're gonna keep going until we faint from pleasure and fall asleep, Shizuka."
"AHH~!"