Story: Change-Switch Fever

 

The day was quiet at first. Nana and Momo were lounging in their shared room at Rito's place, enjoying what they thought would be a relaxing afternoon. Nana was busy scrolling through her phone, her tail twitching idly, while Momo sipped tea, a faint smile on her lips as she pondered her latest plans for Rito.

The peace shattered as Nana’s communicator buzzed furiously, the screen lighting up with Lala’s face—or at least, a vaguely familiar version of it.

"Isn’t that Lala?" Momo asked, leaning closer with mild curiosity.

Nana answered the call, her tone annoyed. "Lala, what do you want? We’re busy—"

The video feed connected, and Nana’s words caught in her throat. Lala appeared on the screen, her usual bubbly energy noticeably off. Her features were sharper, her voice deeper, and her outfit, while still her standard Devilukean attire, looked loose and awkward on her taller frame. Her hair was pretty dishevelled as well.

"Hi, Nana! Hi, Momo!" Lala greeted cheerfully, waving as though nothing was amiss. Her tail flicked behind her, bumping into a table in what looked like the school’s science lab.

"Lala…?" Nana stared, her eyes narrowing. "Why do you look like a guy? And why is your voice so weird?!"

“Oh, this?” Lala said, gesturing to herself casually. “Funny story! Turns out, there’s this gender-flipping illness going around school. I think it started with Run catching a human flu, and something about her alien biology mutated it. It’s super contagious! Anyway, it got me, too! Isn’t it interesting?”

Momo leaned closer, intrigued. “Run’s flu mutated into a gender-flipping microbe?”

Lala nodded enthusiastically. “Yep! Mikado-sensei figured it out before she caught it, too. She said something about it rewiring DNA temporarily. It’s fascinating! But, uh, she also said it makes you really horny once it hits…”

As if on cue, Lala yawned, nearly dropping her communicator. "Mmmm, it's hard again~ Ooooh~"

“Wait, so this flu thing is just spreading around your school?” Nana asked, her tail bristling. “Why aren’t you doing something about it?”

“I was going to!” Lala said cheerfully. “But then I started getting really really horny, and I thought, ‘Oh, Nana and Momo will know what to do!’ So here we are!”

Nana groaned, running a hand down her face. Definitely suppressing part of this conversation. “Why does everything turn into a disaster with you?”

Momo, meanwhile, tapped her chin thoughtfully. “So the whole school is affected? Even Rito-sama?”

“Uh-huh!” Lala chirped. “Rito turned into a girl, too! He’s so pretty now!”

Momo’s eyes lit up. “Interesting…”

“Don’t even think about it,” Nana warned, glaring at her sister. “This isn’t one of your harem plots. We’re staying out of this mess!”

“Oh, I completely agree,” Momo said smoothly, already pulling out a portable containment device. “We’ll assist remotely. It’s only logical to quarantine the school and keep ourselves from getting infected. But we should help—after all, it’s Lala’s school, and this could strengthen some very important relationships.”

“You mean your dumb relationship plans,” Nana snapped. “Ugh, fine. Let’s go before this gets any worse.”

====

Later – Outside Sainan High School:

With the school now encased in a shimmering energy barrier, Nana and Momo stood a safe distance away, monitoring the chaos inside. Students wandered aimlessly, some experimenting with their new forms, others flopped dramatically on the floor from sheer exhaustion.

“Good thing we set this barrier up in time,” Nana muttered, crossing her arms. “This whole place looks like it’s falling apart.”

Momo smiled serenely as she observed the data on her handheld scanner. “Fascinating. The microbes are incredibly adaptive, yet they only target secondary sexual characteristics. It’s practically harmless—well, unless you count the psychological effects.”

“Harmless?!” Nana gestured toward the window, where Rito—now Ritoko—could be seen stumbling awkwardly, clutching at his oversized shirt to keep it from slipping. His long, flowing hair framed his red face as he looked around in a daze.

Momo’s smile widened. “Oh, Rito-sama is stunning like this. Don’t you think so, Nana?”

“No, I don’t!” Nana snapped. “I think we should wait this out and let Mikado or Lala fix it when they wake up!”

“Why wait?” Momo said lightly. “This is the perfect chance to observe how Rito-sama and his friends grow closer through this… unique experience. Adversity brings people together, after all.”

Nana threw up her hands in frustration. “You’re impossible! This is not some kind of bonding exercise!”

Inside, Ritoko tripped over a stray book and landed in a heap, mumbling something along the lines of, “Why is this happening to me?”

Lala, sitting on a nearby desk, looked down at Rito and licked 'her' lips, erection prominent under their clothes. Almost as though dragged along against their will, Lala put a hand upon Rito's girlish rump and poked at it with a prominent, throbbing erection.

"Ah~" Rito moaned, and thrust hips back up against Lala. "We really shouldn't~"

"But we're going to anyway!" Lala chirped, and Rito nodded in agreement. Clothes were tossed aside as the two of them coupled, Lala no longer giving a fuck about putting a stop to this mess because her sisters were taking care of it now. They'd take care of everything from the outside, under proper quarantine conditions!

Or so she hoped they would. Eventually. Once she'd eventually had enough sex to last a lifetime. Which probably wouldn't be anytime soon!