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English
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Published:
2025-12-14
Updated:
2026-01-10
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6,058
Chapters:
2/?
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23
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Puppies, Toys, and Teenage Boys

Summary:

When a Villain attack on U.A. results in 5 boys being mentally regressed, the school doesn't know what to do. But someone steps up to take care of them until they find a way to reverse it.

Aka Regressed Boys being taken care of and having fun.

Deeper explanation of the "only occasionally" tags at the bottom note of the prologue.

Notes:

Prologue Chapter! Introduction to my OC and the events leading up to the first chapter.

Chapter 1: Prologue

Notes:

(See the end of the chapter for notes.)

Chapter Text

The Smell of smoke and debris filled the atmosphere of Gym Gamma, as Class 1-A worked on Quirk Training. Bakugo was yelling as always, mostly at Midoriya, while Todoroki stood watching with a blank face. Kaminari was messing around with Kirishima instead of actually training like they were supposed to. While for the most part, everyone else was training normally.

On the sidelines stood a girl with long pink hair. It was very light and pastel, to the point that, from afar, you might think it was white. Her hair was fluffy, with curtain bangs, pulled into a simple braid that fell over her shoulder. She was pretty tall, standing around the same height as Todoroki. A first-aid kit sat next to her, among other supplies. Water bottles, sports bars and drinks, soft towels to wipe away sweat, a portable handheld fan, and more.

Hisa Aishugo, commonly known as Trixie for unknown reasons, is a general studies student. She didn’t have a dream of being a hero, but wanted a good education. So she attends U.A. What she really wants is to be a mother. Not as a job, she’s just always wanted to. When it comes to her career, she wants to work in a field that serves people. A nurse, a daycare worker, at a retirement home, maybe. She just has a natural protective instinct, which is why Class 1-A loves her.

Her origins were confusing. Not necessarily in a bad way, but it revealed how she came to have this personality. She was born in Shibuya, Tokyo, to her biological parents. Who she never got to meet.

Trixie grew up with two parents of multiple cultures. Her mother originated from Costa Rica and immigrated to the United States as a teen, while her father came from Morocco, moving to Australia for college. They both worked as humanitarian aid workers around the world, where they met.

They were stationed in Japan for a few years as part of their work, providing aid to cities devastated by a vicious villain attack. After learning that there was an infant girl whose parents hadn't survived, they decided to foster her and eventually adopt her. That baby was Trixie.

She experienced traditions from many cultures, travelling the world with her parents to provide aid. In those places, she learned so much about others and their cultures. Because of this, she was accepting, understanding, kind-hearted, and full of love.

She was accepted into U.A. instantly, given how intelligent she is, though she seemed almost bored there. So she tested out of multiple classes and was given numerous free periods. In her free time, she began volunteering in the infirmary with Recovery Girl and was assigned as an on-site training aide. Kids started to get attached to her, seeking her out for even the smallest scratch, just to get a cute band-aid, and reassurance. When the hero course students moved into the dorms, she’d stay late at school because they’d want her to stay with them. She’d cook and clean for them occasionally, have multiple kids huddled around her for movie nights, and mediate game nights.

These kids really trusted her, and she loved that she could provide a safe space for them. Even Bakugo would listen to her and never yell at her. She’s definitely much different from his actual mom.

Currently, she watches like a proud mom as all the kids train, some even looking over to her for approval every so often. But soon, that’d all change.

The sound of an explosion rings out, followed by debris and smoke falling everywhere. The villain attack alarm goes off as a group of villains storms in through the hole in the wall they created. It wasn’t the league of villains, luckily, but these villains didn’t look any more normal. As Kids run to protect one another or prepare to fight, they realize the villains aren’t trying to hurt them; they're simply trying to cause complete chaos. Apparently, that was their gig. To just bother people and make their lives harder.

What a bunch of idiots.

If chaos was what they wanted, they definitely had good quirks for that. One glitterbombs a group of kids. Another can turn anything they touch into a fire hydrant. Literally, what use does that quirk have besides just being bothersome? The gym is filled with nothing but, what can only be described as, tomfoolery. At this point, you’ve gotta hope their group name is The Tom Fools.

Amidst the mix of glitter, fire hydrants, and other stupid quirk, comes a big gust of opaque pink smoke. Caught up in that smoke were Bakugo, Midoriya, Todoroki, Kirishima, and Kaminari. Nobody could’ve guessed what that smoke did.

It’s about time that All Might shows up. He bursts through the door, which was apparently enough to scare off the group of boneheaded villains, who instantly start filing out of the hole they created in the wall.

Once the coast is clear, Trixie springs into action to help anyone who was hurt. As the smoke finally starts to clear, it reveals the boys to be unconscious. Trixie is on her feet in seconds, rushing to their side.

Todoroki is the first to stir, blinking softly before looking around. He sits up, looking at Trixie, not stoically this time, though. His eyes were wider, his lips parted just slightly. He almost looks like an empty-minded baby. Which they were about to find out was close to the truth.

“Todoroki!” Trixie quickly comes closer, “Are you hurt? Does anything feel wrong?”

Todoroki shakes his head, one hand coming up to rub his eye.

“Sleepy,” He mumbles, before latching onto her, snuggling into her chest.

The shock of Todoroki just randomly hugging her doesn’t last long, before she gets a shock from another boy.

Bakugo awakens next and is very clearly angry. Not at the villain's attack. At Todoroki.

“Get off her!” He yells, sounding more like a whine, “You’re Hogging her!”

Just like that, another boy is clinging onto her. If she hoped the other boys wouldn’t be acting like this, too, she’s going to be severely disappointed. One after another, the boys wake up. Midoriya is the next, sitting up, seeing both Bakugo and Todoroki clinging to her and joining in.

“Trixie!” He cheers, squeezing himself in.

This wakes up Kirishima, who is just as happy to jump into the group hug. He doesn’t say anything, but is very entranced by her hair, grabbing and pulling at it like a toy.

“Okay, Guys, what's going— AH!” She’s cut off by someone jumping on her back.

“Trixie! Can we go get ice cream?” Kaminari asks cheerfully as he crushes her.

This was a god awful thing to ask. All four of the other boys start excitedly agreeing until so many people are talking that the only words she can make out are “Ice Cream”.

“Aizawa! There's something seriously wrong!” She yells over the babbling boys, looking around the room for him.

Her eyes lock on him, trying to sneak away. Oh yeah, great. Leave the overgrown toddlers to her. Isn’t this more so his job?

“Aizawa!” She shouts, making him turn around like a deer in headlights.

But her shouting also seemed to set off the boys. Some starting to cry, others curling up into her. As if things couldn’t get any more chaotic, now five teenagers are crying to her because she raised her voice.

———————————————————————

“So what do we do?” Mina asks.

The boys are currently fighting over the building blocks Momo had made for them. Kirishima and Kaminari are trying to build the tallest tower. Bakugo was complaining that they were hoarding all the blocks, which somehow equated to him taking Midoriya’s blocks instead. This causes Midoriya to get upset, throwing a fit and accidentally knocking over Todoroki’s humble (small) tower.

“They’re going to destroy this place,” Jirou sighs, rubbing her temples.

“They seriously can’t find a way to turn them back without the villain who caused it?” Sero asks with his hands over his ears to block out Midoriya’s crying.

“Guys, please, I promise there are enough blocks for all of you. You just have to share,” Trixie tries mediating.

The others watch sympathetically. Trixie is the only one the boys have even remotely listened to. Remotely is the keyword, because she gets a wooden building block chucked at her face by Bakugo, which is the trigger. Kirishima starts screaming, literally screaming at Bakugo for hurting her. As his best friend, Kaminari jumps in, yelling at Bakugo as well. Todoroki, the poor, socially oblivious boy, sees the other two screaming and decides to join in. Midoriya is crying because everyone’s screaming. This all ties back to Bakugo, now screaming as everyone screams at him.

Randomly, All might enters the dorms, presumably to see the state of his students. But he was also, for some odd reason, in his large form, which he no longer transforms into after retiring.

These boys couldn’t make up their minds about what emotion they were feeling; they'd forgotten they were just crying, and now were fanboying over all might.

“OH MY GOD IT’S ALL MIGHT!” Midoriya shrieks, the first up off the floor.

All Might worked there. He taught these kids. He mentored Midoriya for months. But it’s like they’ve never met him before, because all five boys are now crowded around All Might, hugging him, shouting over each other, tugging at his sleeves.

Except they’ve learned by now that peace lasts only seconds. Because someone has to open their big mouth. Their big, pointy-toothed mouth.

“Yeah, you’re no crimson riot, though” Kirishima drops like a bombshell.

The room goes completely silent, most people frozen in fear. It takes mere seconds before Midoriya and Bakugo are screaming and trying to attack Kirishima.

Trixie is already so tired, she actually takes the time that all might is trying to keep them in line and flops to the floor with a deep sigh.

“Still want kids, Trixie?” Sero’s voice comes from above her.

She doesn’t need to look up to know he has the most shit eating grin possible on his face. If she weren’t completely drained, she’d knock that smirk off his face.

“Not five at a time, that’s for sure,” She muffles into the carpet.

———————————————————————

It’s been about a week since the “Teenage boys become toddlers” Incident. There are no leads in the case to find the original quirk user, and everyone was tired. The boys have been better at regulating their emotions. As in, they aren’t crying or screaming at every little thing, probably due to adjusting to their new mind and emotions. But things still weren't perfect.

Over time, they discovered that each boy had one random developmental factor reversed, too. It was different for each of them, and it took a while to figure out what was happening.

Kirishima’s Motor skills had regressed, as they discovered when they tried sending the boys to school anyway, only to find his handwriting was horrendous; they didn’t even think what he wrote was words. He couldn’t hold his pencil correctly and opted to doodle instead since he got bored, but even those weren’t very clear.

Denki, poor boy, forgot how to read. They learn this when he couldn’t read his assignment. Couldn’t even sound it out.

Shoto regressed in his sleep development. He didn’t often sleep through the night, but fell asleep multiple times during the day.

At first, they didn’t think Bakugo had any regression in developmental factors and thought he was just being his usual self. He was often mean to the others, wouldn’t share or play with them, wouldn’t listen to the rules, and stuck by Trixie more often than not. Though they later found that these were regressions in social/emotional development.

Izuku was the worst. Not in his behavior. Not because it was confusing. But because it upsets him the most. Izuku was naturally emotional, and that emotion only deepened in his regressed state. So when he started having accidents, due to ignoring his need, not realizing his need, or not having enough time, He’d cry for what felt like forever. Trixie would clean him up, get him changed, and comfort him afterwards, but he was always so distraught. He’s actually the one they’ve already made progress with, as they wanted to stop all the crying.

After about 3 weeks of struggles, no leads, and a lot of tears and fighting, they decided a more serious solution would have to be put into place, especially since Endeavour wasn’t all too happy about his son now falling behind on hero training due to this incident.

———————————————————————

“So he’s seriously trying to sue the school?” Uraraka whispers at the table where they’re watching Trixie supervise the boys.

“Not just the school. The Hero Public Safety Commission as well,” Momo corrects.

“The HPSC? What do they have to do with it?” Sero Questions.

“I don’t know, he’s gone off the rocker at. At this point, I wouldn’t be surprised if he tries to sue the government,” Mina rolls her eyes.

“Knowing him, he’d find a way to blame All Might and Sue him also,” Jirou scoffs with a smirk.

“Don’t give him ideas!” Sero exclaims, making the room laugh.

———————————————————————

“They’re just giving in!?” Trixie yells at Nezu.

Nezu sit calmly at his desk, Aizawa standing beside him, tired as usual. The commission had provided an update that didn’t seem to please Trixie.

“Aishugo-san, we understand—”

“You don’t understand anything!” She interrupts him, “You can’t just send these boys to a random house with some random caregiver just because Endeavor got his testicles in a twist!”

“Please never say that again.” Aizawa shudders at her last sentence.

“Aishugo—” Nezu tries again.

“I’m not finished. For one, it's Trixie! For two, I don’t care if endeavour calls the fucking emperor, I’m not letting those boys get put in the hands of a stranger because U.A. doesn’t want to handle them and the commission doesn’t have time for a lawsuit!”

“Trixie, the offer the commission has given is very generous, and U.A. is pitching in as well. They’ve offered a house, no bills, funding for anything they would need, and someone who will take care of them until they can be turned back,” He explains, for firm.

‘It’s extra trauma! It’s not a generous deal; it's giving up on them!” She stands.

“I know you’re worried about them, but there’s only so much we can do,” Aizawa intervenes.

“Only so much we can do?” her voice drops lower, crossing the room towards him, “Yeah, there is only so much you can do. But you’re not fucking doing it! You’re settling for the bare minimum because you’re already over it. Well, Guess what!? I’ve been the one dealing with them! I’ve been the one making sure they’re all okay! You’re the one who tried to sneak off the second it happened. You don’t get to decide who takes care of them when you haven’t done shit this whole time!”.

By the time she’s done yelling, she was in his face. Mere inches away. Nobody ever dared to yell at Aizawa, let alone cuss him out. Trixie wasn’t even one to cuss usually, so her actions were entirely out of nowhere. Anger rises in the man, ready to discipline Trixie for talking to a teacher that way. But Trixie was fearless. Nothing would stop her from protecting these boys.

“I don’t care if you’re older than me, or if you’re a teacher,” She pretty much reads his mind, “I won’t sit here and be silenced just because you were born before me. I won’t let you blindly decide for these boys for some cash the commission is throwing at you to keep everyone quiet. So fine. If they want to give them a fancy house and toys, I’ll let them. But they aren’t putting them with a stranger. If we're doing this, I’m going to be the one taking care of them.”

The anger that boiled in Aizawa was smacked out of him by the truth in her words. She cared more than anyone and had long since earned their trust. He wasn’t thinking about what was best for his students; his morals had distorted because he was so tired and gave in to pressure. Exhaustion meets determination when his dark eyes look into hers. Trixie. The only student in his entire career to yell at him, get in his face, and cuss him out, all with no fear—the first to disrespect him and get away with it. Because she was right, he wasn’t thinking about them or what they needed.

“You’re right,” the older sighs, “A stranger will only make them more distressed. We’ll submit a request to put your education on hiatus, along with the others. I’ll call the commission myself to let them know you’ll be taking care of them and make sure you have any needed information,”.

Both Nezu and Trixie are shocked at just how easy he caved, but Trixie wasn’t going to question it. A protest comes from Nezu, but Trixie stops it before it can come to fruition.

“Thank you, Sensei. Trust me when I say I’ll make sure they’ll be safe and happy,” She bows to him.

Before he can comment, her back is turned to him, already on a mission to prepare. The sound of footsteps echoes down the hall—the footsteps of someone with a purer heart and more determination than most heroes. It’s a mystery why there was ever doubt in his mind that she wouldn’t be a perfect fit. All he can hope is that those boys don’t give her too much trouble.

Notes:

Quick Explanation for the "Only Occasionally" tags. (Diapers and Non-Sexual Spanking)

The use of pull-ups and associated things will be mentioned in Izuku's storyline, but won't be a primary focus of any chapters. If it is, there will be a warning before the chapter. If it makes you uncomfortable, I understand, but it is mentioned only occasionally.

As for non-sexual spanking, it will be used in discipline scenes VERY FEW times, and will be used for development and not for gross reasons. However, if that might upset you, any chapter that includes it will also include a warning at the beginning.