"I... I get it. Stop saying it!"
The thought that her best friend in the room next door could hear her lewd cries made Nanami's ears burn with heat. To think her first real "performance" for her voice acting dream would be in a situation like this... her entire neck turned a deep crimson.
Usually, Nanami wasn't this shy during their sessions, but knowing Ichika was listening made it different. And for Rin, a shy, resisting Nanami was the most fun to break.
In the other room, Ichika didn't know how to react. The girlfriend is right here and they're having an orgy next door!?
She looked cautiously at Kaede, but Kaede just shrugged with a look of total indifference.
"What's wrong? Surprised?"
"Uh... haha... definitely. I didn't realize you guys played so... 'hard'~"
Recovering from the shock, Ichika instinctively put on her "cool big sister" persona and closed the window, though her cheeks were stained dark red.
"Your hair isn't dry yet. Sit back down."
Kaede pulled Ichika back to the chair. With the dryer back on, Nanami's cries were mostly masked.
Watching Kaede in the mirror, Ichika swallowed hard. Ever since Mashiro told her the sisters shared Rin, she had been curious. But now it wasn't just Rinon... even Nanami and Mashiro were...
Hearing the faint echoes of Nanami's moans through the wind of the dryer, Ichika couldn't hold back her curiosity.
"Doesn't it... doesn't it bother you? Just letting them be over there with him...?"
"Would it bother you, Ichika? Oh, right..." Kaede stopped the dryer and reopened the window, letting Nanami's melodic lewdness flood the room again. "I lent him to you, remember? He's your 'boyfriend' now. Your boyfriend is next door doing 'lovely things' with other girls... haha, just kidding."
Kaede smiled, thinking back to her system. Ever since it upgraded to the "Netorare Manga Version," the tasks had been pushing her to become the ultimate cuckquean heroine, trying to cultivate a fetish for being "cheated" on.
Too bad for the system, she thought.
Even though Rinon and the others thought she enjoyed being "betrayed," it was all a misunderstanding caused by those weird system tasks. How could I possibly like being cucked?
I'm just faking it to mess with the system. Hmph... even if my body gets wet watching him with other girls, that's just a Pavlovian response from doing so many tasks. Like a cat running when it hears a can opening. It's just biology.
Developing a real cuck fetish? Impossible!
But while the system failed to break her, using it to "develop" Ichika seemed like a fun project. Kaede decided to try something new. Training Sazuya had worked well; now it was Ichika's turn.
Ichika was still a virgin, but her body was already becoming quite "corrupt." Ever since she started this ruse, she had been secretly masturbating in her room multiple times a day to deal with the stress and excitement.
But no matter how much she touched herself, she couldn't reach the level of depravity Sazuya had shown at Kaguya's place. I wonder what Ichika's sisters would think if they saw their perfect elder sister acting like such a slut?
"Let's try this," Kaede thought.
Using the "Sensory Link" like she did with Sazuya would be too obvious. Instead, she set a "Sensory Sync" at a mere 5%—just enough to give Ichika a faint, unidentifiable sensation.
"!!!!!" A feeling from deep within her body made Ichika instinctively squeeze her legs together. She felt something warm and slick beginning to pool between her thighs.
"I used to mind in the beginning, but there was no other way..." Kaede said.
"No other way?" Ichika tried to talk to distract herself from the strange heat in her crotch. Having masturbated before, she knew her body was reacting... Dammit, Ichika! It's just Nanami moaning! Why are you getting so turned off by this!?
Kaede leaned in from behind, wrapping her arms around Ichika's neck. She pressed her lips to Ichika's ear, her warm breath tickling the sensitive skin.
"For example," Kaede whispered, "if you had a boyfriend, but your sisters all fell in love with him too... what would you do?"
Ichika tried to think logically, ignoring the twitching in her core. "I'd... I'd compete fairly! I'm the eldest, but I wouldn't just give up the person I love. I wouldn't hold back."
"That sounds easy, Ichika, but in a competition, someone has to lose. If you lose, how do you face your sisters? How do you look at him? Won't your bond as sisters rot? Won't you be tempted to 'pretend' to be the sister he chose just to have a taste of him?"
"And if you win, what will you do when you come home one day and find one of your sisters dressed as you, letting him fuck her?"
Kaede had read enough "Sister NTR" manga to weave a nightmare scenario for Ichika. Ichika's mind involuntarily replaced Nanami's cries with Itsuki's. She imagined Itsuki and Rin tangled together in bed...
Before Ichika could find an answer, Kaede spoke for her.
"The best way is to forgive them~ Instead of making everyone miserable, why not just all be happy together? And so... this is what we became."
"Ah... I see..."
Ichika bit her lip. While her instinct was to fight, she had to admit Kaede's logic was flawless for quintuplets. If they all loved the same person, a group relationship was the only way no one got hurt.
She understood Kaede's "logic." But...
"What about Nanami and Mashiro?" Ichika caught the flaw.
Kaede's logic explained Rinon, but not the others. Kaede wasn't ready to admit she had a "cuck" interest (even a fake one), so she quickly changed the subject.
"Mashiro is so pure and cute, even I love her. Why wouldn't he? So I don't care. Oh? Why are your legs squeezed so tight?"
"Eh?"
Before Ichika could react, Kaede's hand slid down the silky fabric of her pajamas and dove between her thighs. She expertly pressed down on Ichika's most sensitive, vulnerable spot. A sharp, lewd gasp escaped Ichika's lips.
"A-ahhh~~~!"
"Hehe... I didn't expect you to get so wet just from listening to them, Ichika."