“So… what’s the surprise?” Izuku asked Mina, his lovely girlfriend, having been dragged to her bedroom on the eve of his birthday. Somehow, based on her recent proclivities, it wouldn’t be coming in a box. Her idea of a surprise tended to be playing with herself and him, treating her body like a canvas, or perhaps more accurately like a lump of play to be moulded to her own whims.

“Just a second!” She said with her usual bubbly enthusiasm, digging through one of her drawers until she pulled out, to his surprise, a genuine honest-to-god wrapped birthday present. It even had a bow on it! He was half expecting her to have a bow on herself, with the way her schemes ended…



“Well, come on, open it up!” She said after he gaped in surprise a little too long, piercing him with the look of somebody who was overly eager to see his reaction. He hurried to undo the bow, unfolding the wrapping in his characteristic way rather than simply tearing it apart. Inside was a box, and inside that box was a rather familiar outfit.

He could recognise it just from its individual folded pieces. The white leotard, the gloves, the thigh-highs complete with little rabbit-themed feet at the end… The only thing that was missing was fake rabbit ears to go with it. This was a full Mirko cosplay, and a fairly high quality one by the look of it. Mina picked up the leotard, letting it unfold as she made sure he got a good look a tit.

“Did you know that Mirko’s costume has consistently polls at top three female hero costumes since her debut?” Mina informed him putting on the voice of some sort of quiz show host or TV presenter. “With a positive approval rating amongst ninety-three percent of men? Statistically speaking, you should like it too. Right?”



Mina got right up in his face, waiting for his answer.His face said it all, and she grinned, backing away with leotard in hand. He would absolutely be lying if he said it wasn’t in his top three female costumes, something he may have let slip while rattling off facts about her himself a while ago when he was talking about various other heroes. After Mina’s, of course.



“...you don’t want me to wear this, do you?” He said cautiously, Mina giggling.

“Not this time! Unless you really want to, it’s your birthday gift, after all. But you’ll have to wait your turn!” She said, starting to strip out of her uniform. She slid off her socks, let her skirt hit the floor, and was out of her blazer and blouse within a few seconds with trained speed. With a lewd smile on her face, she also unhooked her bra and slid her panties down until she was completely naked, her bright pink skin completely unveiled.

“I’m pretty sure that Mirko doesn’t wear these under her uniform.” She winked at him, holding up her panties before letting them drop to the ground. “I’ll be sure to ask her one day, once I’m on her level.”

Izuku watched eagerly as she put on the blue sports bra that accompanied the leotard, Mina pausing for a moment as it seemed a little loose on her. Then, she let out a gasp as her chest visibly inflated, her already generous chest pushing out the bra until it was so tight you could see her stiff nipples through it, easily gone up two or three cup sizes. She tenderly groped them, both for her own enjoyment and his.

Izuku sighed internally. Of course it wouldn’t be as simple as a normal cosplay. Not that he was complaining. And if her chest got bigger, then next was…

Next was the leotard, Mina able to zip it up herself. Used to wearing a skin-tight outfit, she did feel that it was a little breezy around the thighs, although she was used to being sleeveless.

“This is pretty comfy! Maybe I should change mine to match!” Mina said, pointing at the fuzzy collar, then looked like she had suddenly remembered something and pivoted on the spot, sticking out her ass just in time for it to start plumping up as well, Mina placing her hands over it, Izuku’s eyes nearly bulging out his his head as he observed how her ass cheeks pumped up multiple times, each one making her hands visibly smaller relative to their size until she had a massive, wobbling bubble butt that he was pretty sure was far bigger than the real Mirko’s had ever been. Again, he had no intention of complaining.

“There we go, nice and tight!” She said, lifting the material with one finger and letting it fall onto her big ass with a meaty smack. Her Mirko cosplay already half-done, he had to admit that for all her curves, she was missing arguably the most important part: the muscles. Her chest and butt wobbling slightly as she bent over to pick up the thigh highs, she made a show of sliding them onto and up her leg, letting them fall with a gentle slap against her skin as she finished pulling them up as high as they could go. Izuku noticed that the thigh gap ratio was identical to Mirko’s, meaning that this outfit was custom-tailored to her proportions, albeit giving her room to grow. And these seemed just a little loose as well…

His rapid theorycrafting was answered as he watched her usually soft, pillowy thighs suddenly start to harden, thickening considerably, but looking like they were carved out of rock as the excess body fat vanished, replaced with pure muscle. Mina lifted her leg, her flexible body allowing her to lift it almost up to her head as she did a near-full rotation to show off the muscle definition.

“I could get used to these!” She said, slapping the side of her thigh with one hand, producing a very different sound than the rest of her softer body. Perhaps that was why she felt the need to make her ass so big and jiggly, otherwise the muscles gained would have balanced it out.

She pulled on the gloves, and hit a body-building flex to show off as those two doubled in thickness, rapidly filling out with musculature until she was just as chiselled as her boyfriend. She hit a few more poses, less focused on being sexy and more of a showoff, although those two were inherently the one and the same. Isuzu was transfixed, enjoying himself just as much as she was.

“Okay, just one more thing! Whenever it feels like it…” Mina proclaimed, rubbing the sides of her head. “Come on, come on, where are they, the instructions said they should show up pretty soon…”



Mina’s prayers were answered, as no sooner had she finished grumbling did two long white rabbit ears shoot out, growing over and replacing her ears. She was a slightly odd sight, with white rabbit ears poking out of her frizzy pink hair, her yellow antennae still there as well. It seemed that she had no intention of completely replicating her appearance and doing away with her own pink skin, more invested in just the broad strokes of Mirko. It would also probably not go down well for somebody to be selling a full-on impersonation kit… Although that was probably a lucrative underground market. But the costume itself was highly accurate, save for the extremely visible camel toe that was ambiguous as to whether Mirko really did wear panties under her uniform, or if she went commando and this was merely an artistic decision from whoever made the outfit.

“And for the grand finale!” She turned around and pointed at an open patch above her butt, where a fluffy white tail promptly popped out. Izuku clapped as she turned and bowed at the conclusion of her show, only to be cut off by her hopping like a rabbit directly onto him, tackling him down onto the bed behind her.

“I bet even you couldn’t break out of this one!” She proclaimed, pinning him down by hooking her powerful legs under his own thighs.



“Not without using enough strength to hurt you. I might have to go a little overboard…” Izuku laughed. “Alright, now you can let go, this is starting to hurt a little…”



Izuku attempted to slide himself out, but she only pulled the pin tighter, next grabbing his arms and holding them in place. Her floppy rabbit ears brushed against his face, and he could see her face turning red through her pink skin.

“Hey, Izuku…” She said with a breathy voice, Izuku able to feel a certain wetness where she was pressing her crotch against him. “Do you know the other thing that rabbits are known for?”

She didn’t let him answer, kissing him deeply as she began to grind against him. This would be a birthday to remember for sure…