Nyamo sighed deeply, slowly closing the locker in the school locker room. Yukari groaned, laying on the bench behind her, flopping her legs around boredly. "Come oooon! I wanna swim already!" Yukari whined, looking rather silly, throwing a temper tantrum while dressed in a rather skimpy bikini.
Nyamo looked over her shoulder, raising an eyebrow as she watched the wriggling woman. "Alright, first off, we technically shouldn't be here. Not only is it after hours, it's actually night time. I'm not even sure how you convinced me to even let you do this..." Nyamo said, undoing her bra and stripping off her underwear, standing nude as she took out her school assigned swimsuit, starting to slip it up her shapely legs.
"But it sounds so awesome! No dumb kids bothering us and crowding up the pool, free access to the diving board any time, nice cool air~! Plus, I don't have to worry about the principal getting all up in my business about dressing how I want!" Yukari said, sounding proud as she quickly bound up, doing a rather sexy pose, bending over to stick her bottom out, which squeezing her breasts between her arms, giving a mocking lustful look over to Nyamo.
Nyamo sighed in exasperation, adjusting the straps of her swim suit. "And that's the second thing! Even if it's after hours, can't you at least TRY to follow school rules? You have a swim suit here already, and it provides much better support for swimming!" She exclaimed, starting to put her clothes away in her locker, sitting down on the floor, starting to stretch. She could hear Yukari groan again, before grabbing her towel and heading to the door. "Man, stop whining and complaining! You sound like such a baby!" Yukari said, sticking her tongue out at the woman, currently sitting on the floor, her legs splayed out before her as she stretched.
Both of them froze, as something very odd happened. Yukari's jaw slowly fell open, as Nyamo's head quickly looked down. Between her legs, a small puddle was starting to form around her, growing rapidly. Nyamo's face became bright red, as she quickly jumped to her feet, putting her hands on her crotch and crossing her legs, in an attempt to impede the flow. It was no use, though, as she continued to leak down her legs quite freely.
Yukari choked back a chuckle, as she quickly ran back over to Nyamo. "Weeeell, things are getting interesting~!" Yukari said, rather excitedly as she gave Nyamo's bottom a slap, a wet sound resonating throughout the locker room.
"S-stop it! I'm just... stressed!" Nyamo whined, trying to step away from Yukari. Yukari didn't let her out of her grasp, though, grabbing her under the arms, heaving as she lifted her up in the air. "No no! If Nyamo is gonna be a whiny baby who wets herself, then you need something to protect that~!" Yukari teased, laying her down on the bench.
Despite the fact that Nyamo knew she could get up by herself, for some reason, she stayed laying down on the bench, watching as Yukari went over to her friend's locker, opening it up. "Hm... This should work as a diaper!" Yukari said, pulling out Nyamo's shirt. She walked over, sitting down between Yukari's legs, "First, off with this!"
Nyamo tried to fight, but for some reason, her constitution seemed to be fading from her. She could only bat at Nyamo's invading hands weakly, as she grabbed her bathing suit and pulling it down. It wasn't long before Nyamo was laying there, nude, her swimming suit thrown wistfully away. "Now then, your diaper~!" Yukari said, almost too happily, as she took the T-shirt, starting to fold it to make it more fitting, before placing it underneath her, pulling it in between her legs.
Yukari hummed to herself as she started to pull the diaper up, tying it to the side to make it a more proper diaper. Nyamo couldn't bear to look, instead leaning her had back to look at the ceiling. "This is so humiliating..." she said to herself softly, as she felt the shirt being tugged at, for some reason not really able to fight what was happening to her...
She soon looked down, though, when she felt something off. Peeking down, she noticed her shirt, which was a respectable button down green top, was now... Whiter... And thicker... And had more tapes than it had before, which was zero... Somehow, Yukari was now taping up an actual diaper to her waist, and didn't seem to be acting differently at all about it. "Wha-?" Nyamo said, as Yukari finished, clapping her hands together in finality. "There! Done rather professionally, if I do say so myself!" Yukari said smugly, pulling Nyamo up to a sitting position, a lot of crinkling being heard as she sat on the thick diaper.
To say Nyamo was confused was putting it lightly. First she wet herself, then her shirt turned into a diaper, and for some reason, despite knowing that it was very wrong, she found herself fighting it very little. "Why am I in a diaper?" Nyamo asked slowly, looking up at Yukari, who was now pulling her up to her feet.
"Because you wet yourself! But don't worry, most high school girls wet themselves during end of term exams~! It's why I suggested we go for a swim tonight!" Yukari said, stopping in front of a mirror near the bathroom.
Nyamo's eyes widened as she looked at herself, noticing that something was definitely off. First off, she was wearing a diaper and nothing else, despite being obviously too old for them... But her chest seemed... Less impressive. Her thighs were thinner, her face less mature. She looked like... A teenager, like Yukari had just said... That was wrong, but she found herself nodding, agreeing with what Yukari said. "Yeah... I've been studying a lot for... My classes..." Nyamo said, in a slight daze, her eyes locked with herself as Yukari clapped her back. "Yup! Now then, let me go get your swimsuit and we can go!" Yukari said, walking away from her.
Nyamo simply stood there, staring at herself. She wanted to walk away, to yell at Yukari for making her look so dumb, but she stayed rooted to the spot. All she could do was watch herself, as her already less impressive chest became even smaller, soon matching the size of her belly, which had ballooned out. She frowned a bit, only accentuating her now chubby face, crossing her arms. She shifted uncomfortably on her now tiny feel, looking around uncomfortably at the now bigger room.
When Yukari walked back, there was a little girl standing there, probably no older than 2 or 3 years old, staring at herself in the mirror. "Come on Nyamo-chan! Time to get you dressed!" Yukari said, taking her hand. Nyamo followed obediently, walking along with her, still frowning.
Yukari lifted her up, standing her on the bench, holding up a small pink one piece, a skirt attached to the waist. "What's wrong sweetie?" Yukari asked, seeing her frowning face as she pulled the swimsuit up her chubby legs. Nyamo wanted to say that something was wrong, but she felt herself speaking a different concern than was actually on her mind. "I's neva swam before... I's scared Mommy..." she said, putting a finger to her mouth as she looked at Yukari.
Yukari giggled, pulling the swimsuit up her, guiding her arms through the holes. "Well, don't worry! I'm an excellent swimmer! Just wear these and hold on to Mommy, and you will be all right!" Yukari said, slipping some water wings up her arms. For some reason, the water wings made her feel at ease, and before long, she was smiling, hugging Yukari as she lifted her up, heading to the door. "Just make sure to keep it down... We're not supposed to be here this late!" Yukari said, with a devilish smile as she patted Nyamo's bottom, who giggled as they headed to the pool.
"Okay Mommy~!" Nyamo said, happily, excited to be swimming for the first time with her mother Nyamo. Not even the soggy diaper could stop her from being happy to finally be getting into the pool! "Wet's go swimmin'!" she said excitedly, clapping her hands happily, not a care in the world. Why should she though? As long as she was safely in Nyamo-mama's arms, nothing bad could happen~!