[ABDL, Soiling, Dick Growth, Brain Drain]

Usagiyama Rumi, otherwise known as the Rabbit Hero Mirko, was not having a great night. And while there were many reasons for her night being awful, the one that stood out the most was the way that most of her fellow Pro Heroes seemed to have vanished over the course of the last few weeks.

What had happened, exactly? She didn't know. Nobody bothered telling her. Beyond that, it almost seemed as if the ones that had disappeared didn't seem familiar to anybody she asked. Whether it was somebody like the gigantic and impossible to miss Mount Lady, or the seductive Midnight. Nobody seemed to remember them.

"I swear, if this all turns out to be one giant prank and I'm not in on it, I'm going to kick the person straight to the moon." Mirko muttered as she leapt from building to building, trying to desperately find some sort of clue that would lead her to the culprit.

As she leapt onto the roof of an abandoned storehouse, her senses were assaulted, and she very nearly toppled over and stated gagging thanks to the awful stench. She had expected this kind of smell to come from a factory, the hell were they storing in here?

It had to be some sort of villainous activity. With any luck, she'd be able to interrogate the common crooks that they employed, and then try to piece together who might've taken away her friends. Worst case scenario, she just stopped a plot that was entirely unrelated to their disappearances.

"Alright, hands in the air, your plan's b-b-b-buhhh?"

When Mirko broke in through the roof to try and stop the smell and hopefully any crooks that might've been taking advantage of it, she was surprised to find the entire inside of the dark and damp looking safehouse covered from top to bottom in so much padding that it looked more like an enormous nursery than a place to store one's weapons. Not only that, but the smell became more potent as she descended towards the ground, to the point where even somebody like her could tell what exactly the source of it was.

Compressed. Human. Feces. Or, to put it bluntly, the smell was so powerful because it came from one big pile of shit. And the source of it was sitting right in front of her, which only served to make this enormous nursery make so much sense.

"Poopy!" A loud infantile voice cried out, and the sound of wet farts echoing out through the nursery almost threatened to crush down on the rabbit. As well as the sound of filth out of her weakened hole, only emphasized by the way that her enormous and person-sized diaper quickly started to crinkle as it was filled with another load of pure filth.

That sight was what ended up paralyzing Mirko. The sight of a hero as self-absorbed as Mount Lady, now laying on her back with drool running out of her mouth as she helplessly shat herself. The only way she recognized her was through her size as well, because her hair had been neatly trimmed to make her look like an adorable baby girl instead of a silly hero.

"What kind of crazy plan did I just stumble on?" Mirko muttered as she covered up her face and bounced away from that massive diaper, hoping to make as much distance between her and the stench as possible. Anything to keep herself from-

As she landed, the softness of the floor was far more than she expected, causing her to lose her footing and tumble backward. Rolling and rolling, her head spinning... Until she ended up bumping into somebody that looked almost as familiar as the gigantic baby.

"Ehehehe... Bunbun!" Another infantile voice echoed out, and as Mirko opened her eyes to identify who else had fallen prey to this strange predicament, she winced as she noticed a familiar looking mask on a short-haired woman's face. That, and the obnoxiously sweet fragrance that made it impossible to get a whiff of all the waste that had been packed into her diaper.

Midnight, one of the other heroes that Mirko knew, was sitting right there. In a beanbag chair-sized diaper pumped full of all of her waste. Had she ever gotten a change? It was hard to tell. One thing was certain though, whoever had done this to these two heroines... and whoever else they had gotten their hands on?

They were a sick freak. And she needed to get out of here before she ended up joining them.

"Oh my. Another Baby came here all of her own volition. How wonderful."

Mirko's ears twitched as she turned in the direction of the new soothing voice, her body already highly alert after everything she saw. She wasn't about to end up like the others. Not as long as she had a chance to fight back. "I'm not a Baby, and they won't stay this way as long as I beat you!"

The 'culprit', a red-haired woman dressed like a common office worker, smiled in the face of the bunny heroine's claim. "Adorable. You know, they were just like you. Trying to prove themselves as adults. But they understood after a while. After getting loved by their Mommy." She chuckled, taking a few steps towards the tanned heroine, not fearing the power in her body at all.

"Who are you even supposed to be? A villain? I've never seen somebody as twisted or as messed up as you. Seriously, what kind of villain wants to turn people into babies?!" Mirko shouted, though she didn't move to try and make some space between her and the woman. There was absolutely nothing that indicated that she couldn't just give the woman a good kick and be done with it. But she wanted to understand. So it'd be easier to apprehend her and keep people from ending up like Midnight and Mount Lady did.

The woman just continued smiling. "Well, you won't be remembering it any time soon. But you can just call me Mommy Makima. As long as a silly Baby like you, who doesn't realize what a bad girl she's been, keeps trying to stand up and act like you're older than you really are... I'll be there. To put you back where you really belong." Makima chimed, continuing to act as if she was practically invincible in the face of a proper heroine.

"Yeah, right!" Mirko shouted, as she sprung to action. She had heard enough. All it would take was one good kick, and-

As quickly as she tried to jump, she fell right down. And there was a very good reason for it too, because the rest of her body felt just as heavy... No, as numb as her legs. What had happened? Why couldn't she try to hit the woman in front of her? Was she... Was she able to manipulate her body or something? Just through a simple thought?

"Good girl, Baby Midnight." Mommy Makima giggled, and the truth hit the bunny like a freight train. It wasn't because Mommy had done anything. No, it was because of the sweet scent that came from Midnight. It had made her muscles pass out, leaving her beyond vulnerable to anything that the villain wanted to do to her.

Mirko tried to make her body wake up, but all she could do was look up at the redheaded woman who pulled a rabbit-patterned diaper out, as well as a cute carrot-shaped pacifier. "G-Get away..."

Mommy Makima didn't listen. Why would she listen to a silly little Baby? No, she had much more important things to do. Like carefully sweeping the paralyzed Baby's legs into the air so she could fit the adorable diaper under her bottom, and then spread those very same legs apart so getting the wings weaved through the gap between her thighs wasn't an issue. Finally, she squeezed her newest Baby's legs back together as they squished against the crinkly and embarrassing garment between her thighs, while she snapped the wings shut and left her nice and cuddly and padded until she needed brand new clothes.

The diaper around Mirko's waist was more than humiliating. Not just because it was childishly decorated with adorable rabbits, but because those rabbits were explicitly feminine and had the same sort of colors as her. As if the villain knew that she'd show up and make a fool of herself. Just who was she, if she could plan all of this..?

"How utterly adorable." Mommy Makima chimed, as she grabbed ahold of her sweet little Baby Bunny's cheeks and slowly forced her lips apart by pressing down on both of her cheeks a bit. And she instead of giving her a kiss, she instead let a single droplet of her saliva very carefully drip from her tongue, stretching as far as it could before detaching and landing on Mirko's tongue. Only then did she force her to suck on her adorable pacifier...

Mirko didn't understand. Even as she instinctively started to suckle on the pacifier, she didn't understand what the woman was planning. Why did she drool into her mouth? Why did she do all of this? And more importantly, why did she feel so hhHOOOOOTTT-

The Baby Bunny barely even registered the sound of her crotch crinkling as she was busy getting overwhelmed by the sheer sensation of a fire being lit inside her body. It was like an inferno of pure pleasure had started, and she was getting swept up inside it. She wanted to cum, she wanted to cum, she wanted to cum!

"Ah, there we go. That's why I only use a droplet of my saliva on Babies like you." Mommy Makima softly giggled as she rubbed the tanned bunny's cheek, all while reaching down towards her diaper. Slowly but surely circling a rather obvious bulge that had grown in the front. "I tried giving Mount Baby a kiss, but she just ended up losing everything. Now she doesn't even register that I'm there. Just pooping the day away. Changing her diapers turns into a real chore, you know?"

Mirko wasn't processing anything that poured into her ear. She was too busy humping into her Mommy's hand because she felt it brushing up against her very hot and very throbbing newly grown cock. She didn't understand why she had it, she just understood that she wanted to make lots and lots of cummies with it. And quick too, because otherwise she'd blow!

Mommy Makima smiled. This happened every time she captured one of these heroes. Male or female. A simple droplet of her Saliva would make them a slave to her controlling Quirk. Turning their body against them by making them grow impossibly horny? A simple feat. And one that was nothing short of wonderful to watch.

Of course she'd help her struggling little horny Baby Bun. A simple stroke was all it would take to drive her mad with pleasure, and the rest would come naturally...

Mirko felt those soft fingers grazing up against her dicklet, and her eyes immediately rolled into the back of her head. It felt so good that she didn't even realize that she had climaxed right then and there, the sound of her diaper soaking up the cute cummies basically inaudible to her mind.

It wasn't the only orgasm either. Once she started cumming, it just didn't stop. And since her balls were painfully tiny compared to her thigh-sized cock, it was no wonder that it turned more and more of her mind into cum to compensate. Her life as a heroine, everything she had learned, all of her friends, her skills as an adult, her expectations and her pride. One after the other, all of these things were being turned into cute sticky cummies that were being slurped up by her diaper, never to be returned to her.

And once she had little left to give, the hyper horny bunny, whose diaper had already grown to the same size as Midnight's from how much she came, grunted and panted and stamped her feet against the incredibly squishy pampy as she tried to do something a bit stinkier.

"Hhhaaaaaaah!" The brain drained Baby Bun cried out as her cheeks parted in the back, and her first shit as a Baby poured out from between her cheeks. It was almost as runny as the cum that poured out of her cock, quickly staining the back of her adorable diaper a thick and stinky brown as it was soaked up just like her cummies.

All while Mommy Makima watched and giggled. She had control of yet another Hero. An adorable Baby Bun to add to her collection. She'd go nicely with Midnight, since her huge cumloads would definitely help disable somebody else should she need it.

For now... She was content to just watch Mirko shit herself stupid. Who knows, maybe the silly Baby would earn herself a change once she had shit herself enough.