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The first time she had done this, Kaede had been so nervous she felt like her heart was about to give out with how fast it was racing. She had been terrified of getting caught, maybe even being expelled from the school she’d worked so hard to get into, ruining her entire future over a ridiculous impulse.
But that fear had brought with it a delightful thrill of excitement that had made her knees feel weak, had her clit throbbing in time with her erratic heartbeat. She had locked herself in one of the stalls of the school bathrooms, checking beforehand to make sure no one else was around so she could calm herself, though the simultaneous disappointment that she didn’t have a witness didn’t go unnoted. Sitting down on the closed lid of the toilet, she slipped a hand into her underwear, easing her aching need. It was a little awkward doing it in such an unfamiliar position, but she thought about where she was, about the possibility of someone walking in at any moment, hearing the slick wet sounds and telltale heavy breathing of her pleasuring herself and knowing exactly what she was doing, and she had come so hard and so fast it had even taken her by surprise.
It was so utterly exhilarating that she knew she wouldn’t just be able to leave it at that.
The first time someone walked in on her, it was when she was already well into the act of what had become a regular ritual by that point, losing herself to the pleasure squeezing and tightening at her body when she heard the creak of the heavy door. She paused, trying to listen for any more sounds over her own heavy breaths. Footsteps crept slowly towards her, and she couldn’t stand it any longer, going back to the fast motions, rubbing her clit in circles and she didn’t know where the sudden rush of confidence had come from but she moaned, half out of genuine pleasure and half just to make sure that whoever it was could have no doubt about what they were hearing. The footsteps stopped abruptly, and now she knew they had to have realised what was going on.
She could feel herself rushing towards her climax, thinking about the person, the girl just beyond the thin door in front of her. There was a reason she’d chosen the bathrooms to do this, after all, beyond the obvious fact that it was at least a little more private than most places around the school. Kaede wasn’t oblivious to the way she attracted attention from boys - and it could be fun sometimes, to hike her skirt up just a little when she saw them staring, to tease the shy boy who hung around her a little too often with flirtatious remarks - but it couldn’t even come close to how amazing it felt to think about a girl seeing her that way.
It was a little disappointing that she couldn’t see the intruder’s reaction, as she sped up her movements, gasping and moaning softly with every breath. Maybe the mystery girl was just uncomfortable, maybe a little embarrassed, but maybe, just maybe, she might be enjoying it as much as Kaede was, getting turned on by it, her pussy throbbing with arousal and getting increasingly wet as she listened to Kaede through the door.
Just imagining it sent her over the edge, coming with a moan so loud that even the people out in the hall might have been able to hear it. She gathered herself together, cleaning off her sticky fingers, unlocking the door and hearing rapid footsteps racing towards the exit, seeing a flash of golden-blonde hair that was all too familiar.
Oh. This was perfect.
Miu never said anything to her about it, and Kaede never brought it up either - but she couldn’t help but notice the change in the inventor’s behaviour around her. She had always been easily flustered for all her vulgarity, and Kaede found it downright adorable how she would blush and stutter if she ever made a provocative remark of her own in return. Since that brief encounter in the bathroom, it had only gotten more exaggerated - Kaede would sneak a glance over at her in the classroom, catching her staring and seeing her turn away, using her hands to hide the pink flush creeping up her cheeks.
She knew, and Kaede was surprised at how little shame she felt at that fact, how much she revelled in it.
She went back to the bathroom at the same time each day, and every time without fail, she would hear the creak of the door just a minute later. It was the same act every time - Miu never spoke, never did anything besides wait outside the door, listening to Kaede as she debased herself with increasingly lewd moans. Her fantasies grew more intense now she had a face to attach to them, a tangible person who kept coming back here intentionally to listen to the sounds of her touching herself, who was undoubtedly enjoying it.
Kaede let her mind run wild thinking about the girl behind the door, about all the things they could do together - about touching her, licking her, pleasuring her, seeing her face burn red-hot with a delightful mix of embarrassment and arousal, seeing her mouth fall open in a moan as Kaede used her hands and tongue to bring her to orgasm.
As much as she loved doing this, it wasn’t enough. She needed to keep going further, pushing the limits of her depravity.
Her nervous anticipation came back all over again when she excused herself from class to go to the bathroom with a slightly different plan in mind. She set herself up quickly once she got there, wanting to catch Miu by surprise and knowing she didn’t have much time to do so. She took off her underwear completely, flipped her skirt up around her waist and sat with her feet at the edge of the toilet lid, legs spread, her bare arousal on display as she pushed a finger inside herself, letting her head fall back and relaxing into it
The door to the stall was left wide open.
It was the same as always, the door opening, the slow, hesitant footsteps, until she caught a glimpse of her voyeur’s face, saw her expression turn to one of horror as she stumbled back against the sinks, hand clamped over her open mouth.
“H-ahh- wh-what?” She stuttered out the strangled noise, flushing a darker red than Kaede had ever seen on her before, gripping onto the edge of the sink countertop as if her life depended on it. It filled Kaede with a sense of smug satisfaction, determination solidifying as she flicked the fingers inside her, teasing her clit with her other hand, moaning in the exaggerated manner she’d become accustomed to.
“Mmm- I thought- since you like listening to me so much- hah- that you might want to watch too.”
She saw the way Miu’s eyes flitted over her, gaze coming to rest between her thighs where her hands were working hard to get herself off, the space between them filling with the obscene wet sounds of it. She had never felt so utterly exposed - not just her body on display, but the full extent of how filthy she really was, her state of intense arousal evident as she curled her fingers into just the right spot inside herself, unable to stop the cry that spilled out of her.
“P-Pervert. I ne-never knew the piano freak was such a sl-slut.” It almost made Kaede laugh, just how cute it was that she was still trying to keep up her abrasive, over-confident act, even as it was obvious how watching Kaede was affecting her. Miu never looked away, just staring in hungry fascination as she squeezed her thighs together, as if trying to satisfy her own arousal. It was so much, so good that Kaede could feel her orgasm fast approaching, and when her legs started to shake, almost losing her balance in the precarious position she was in, she could have sworn she saw a shudder rake through Miu’s body.
She didn’t even have to fantasise as she rubbed harder at her clit, bringing herself closer, getting off to the sight of Miu in front of her, embarrassed and visibly aroused and she wanted so badly to let Miu see her come, show her how much the situation was affecting her too. It was a quiet moan from Miu that finally did it, barely audible over all the other sounds in the room, but it might as well have been deafeningly loud for how it made Kaede’s blood surge towards her throbbing clit, coming so hard she was left trembling all over. She fought to catch her breath, the foggy haze of the afterglow clouding her mind, and through blurring vision she barely noticed Miu entering the stall with her until she was close enough to touch, locking them both inside.
“Oh? What’s this about?” Kaede couldn’t help but tease her, even as her pulse raced, mind going wild with the possibilities. Miu was pointedly avoiding eye contact, but her fingers were fiddling with the hem of her school skirt, thighs still pressed together tightly.
“Sh-shut up. You’re the idiot who g-got me all worked up, so… so just t-touch me already!”
Kaede couldn’t help the stupid grin on her face. She stood up on still shaky legs, backing Miu up against the door, lifting her skirt to slip careful fingers under the fabric of her underwear. She felt more than heard the sharp gasp, and almost moaned again herself when she realised just how wet it was as she ghosted her touch over Miu’s lips, her swollen clit.
“And you called me a pervert.”