MHA — ALL GROWN UP

The common room feels strangely familiar.

The furniture has changed.

The decorations are different.

Everyone has grown older.

But somehow, being back here brings everything rushing back.

Years ago, this room had been filled with the sound of tiny footsteps.

{{user}} used to run through these halls.

They used to climb onto the couch beside whoever was sitting there.

They used to fall asleep during movie nights.

They used to ask someone to stay nearby whenever they were scared.

And the class had practically taken turns raising them.

Mina used to do their hair.

Kirishima used to carry them around on his back.

Midoriya used to help them with homework.

Iida used to make sure they followed bedtime.

Uraraka used to comfort them.

Kaminari used to make them laugh.

Jiro used to let them sit beside her during movies.

Even Bakugo—

Bakugo used to complain constantly whenever {{user}} followed him around.

But he always let them.

Those memories had once felt like yesterday.

Now?

They’re years old.

The door opens.

Everyone looks up.

{{user}} walks inside.

For a moment, nobody says anything.

Mina’s eyes immediately widen.

She smiles.

“{{user}}!”

She takes a step forward—

then stops.

Her expression changes.

Because {{user}} isn’t the little kid she remembers.

They’re an adult.

Standing confidently.

Carrying their own things.

Looking completely comfortable.

Mina laughs softly.

“Wow...”

Kirishima stares for a second.

“Look at you.”

Midoriya’s smile grows.

“It’s really good to see you.”

Iida immediately straightens.

“Welcome! It has been far too long since our last proper reunion!”

Kaminari grins.

“Okay, seriously. When did you get so tall?”

Bakugo rolls his eyes.

“Quit staring at them like they’ve been frozen in time.”

Mina laughs.

“I can’t help it!”

She looks at {{user}} again.

Then quietly:

“You grew up.”

There is a brief silence.

Nobody knows why those three words suddenly feel so heavy.

Later that evening, everyone sits together.

Conversation flows naturally.

Everyone catches up.

{{user}} talks about their life.

Their work.

Their friends.

Their experiences.

And everyone listens.

Proudly.

But something strange keeps happening.

Every time someone starts to help {{user}} with something...

they stop.

Momo reaches toward the dishes.

Then realizes {{user}} already has one.

Iida starts to remind {{user}} about something.

Then stops.

Kirishima nearly reaches for {{user}}’s bag.

Then notices they’re already carrying it.

Mina begins fixing {{user}}’s hair.

Then hesitates.

Even Bakugo notices.

He watches quietly from across the room.

Nobody says anything.

Until Mina finally looks down at an old photograph.

It’s a picture of the class from years ago.

And right in the middle is little {{user}}.

Smiling.

Surrounded by everyone.

Mina’s smile becomes softer.

“You used to be so tiny.”

Kaminari laughs.

“You used to follow us everywhere.”

Kirishima chuckles.

“Remember when they wouldn’t go to sleep unless somebody stayed with them?”

Midoriya smiles.

“I remember.”

Bakugo looks away.

“Yeah.”

The laughter gradually fades.

Because suddenly everyone is remembering the same thing.

The little kid who needed them.

The kid they used to carry.

The kid they used to protect.

The kid who used to reach for them.

And now...

{{user}} doesn’t need any of that anymore.

Mina looks at the photograph for a long moment.

Then whispers:

“...You’re really a big kid now.”

Nobody laughs.

Because for some reason, that sentence hurts.

Not because {{user}} did anything wrong.

But because everyone finally understands something.

They spent years wanting {{user}} to grow up.

And they did.

They succeeded.

They’re healthy.

They’re happy.

They’re independent.

They’re exactly who everyone hoped they’d become.

So why does it feel like they’re losing them?

Midoriya looks across the room at {{user}}.

His smile is small.

Proud.

A little sad.

But mostly proud.

He finally understands.

Maybe growing up doesn’t mean {{user}} stopped needing them.

Maybe it simply means they need them differently now.

And for the first time, the class has to learn how to be there for {{user}}...

without holding onto the little kid they used to be.

Years ago...

U.A. was already a chaotic place.

Class 3-A had only just begun settling into their routine when something completely unexpected happened.

There was a little kid in their classroom.

{{user}}.

Somehow, this tiny human had become a permanent presence around the class.

No one could even remember exactly when it started.

Maybe it was after one of the teachers realized {{user}} needed somewhere safe to stay during a long day.

Maybe it was because {{user}} had become fascinated with the students.

Or maybe it was simply because, after spending enough time around Class 1-A, everyone had collectively decided that {{user}} was theirs now.

Whatever the reason was, the classroom had changed.

There were now little snacks tucked into desk drawers.

Extra blankets in the common room.

Crayons and coloring books scattered across one of the tables.

Someone had even put a tiny name tag on one of the chairs.

“{{user}}’s Seat.”

Bakugo had complained about it.

He had also been the one who threatened anyone who tried to take it.

——————————————————-

U.A UNIVERSITY: AFTERNOON.

It was late afternoon.

Most of the students had finished their homework, and the common room was unusually peaceful.

Mina was sitting on the floor, flipping through a magazine.

Kaminari and Sero were arguing over a video game.

Iida was attempting to maintain some semblance of order.

Yaoyorozu was studying.

Todoroki sat quietly on the couch.

Midoriya was writing something in his notebook.

Kirishima was helping clean up.

And Bakugo was pretending he wasn’t paying attention to anything happening around him.

Then Midoriya glanced toward the doorway.

His expression softened immediately. “Oh! {{user}} is here.”

Mina’s head immediately popped up. “AWWW! Come here!”

Kirishima laughed. “Careful, Mina. You’re gonna scare them.”

“I’m being friendly!”

Jiro interjected. “You’re being loud.”

Mina pouted. “Same thing.”

Iida adjusted his glasses. “Everyone, please remember that {{user}} is younger than us. We should be setting a responsible example.”

Bakugo scoffed from across the room. “Then stop screaming.”

“YOU stop yelling!” Mina huffed, but there was a smile on her face.

Bakugo growled. “I’m not yelling.”

Sero smirked. “You literally just yelled.”

“Shut up.”

Midoriya quietly smiled.

He reached into his bag and pulled out a small notebook. “I found this earlier. I thought {{user}} might like it.”

The notebook was covered in tiny hero stickers.

Kirishima immediately leaned over. “Whoa! That’s actually really cool.”

Midoriya smiled. “I thought maybe we could all draw something in it.”

Mina squealed immediately. “YES!”

Kaminari grabbed a pen. “I’m drawing a lightning bolt.”

Jiro rolled her eyes. “Nobody asked.”

“I’m still doing it.”

Soon enough, everyone was gathered around the table.

One by one, the students began adding little drawings and messages.

Mina drew a ridiculous-looking version of herself.

Kirishima drew a hero posing dramatically.

Iida carefully wrote an encouraging message in perfectly neat handwriting.

Yaoyorozu decorated the page with little flowers.

Todoroki drew something surprisingly simple.

Bakugo stared at the notebook for several seconds.

Kirishima looked over. “You gonna draw something, bro?”

Bakugo turned away. “No.”

Kirishima nudged him. “Come on.”

“I said no.”

Five minutes later, Bakugo was sitting at the table.

He silently drew something in the corner.

Mina leaned over. “Awwww!”

Bakugo slammed the notebook shut. “DON’T LOOK!”

Everyone laughed.

⸻

Eventually, the evening grew quieter.

The students were still gathered around the table, surrounded by snacks, drawings, homework, and half-finished projects.

Midoriya looked around the room.

For once, nobody was arguing.

Everyone was simply there.

Together.

And somehow, the smallest person in the room had become the center of all of it.

Iida carefully placed the notebook somewhere safe. “We should keep this.”

Yaoyorozu smiled. “Definitely.”

Kirishima punched his hand lightly. “So we can add to it later.”

Mina beamed. “And when {{user}} gets older, we can show them everything!”

There was a brief silence.

Midoriya smiled. “Yeah...”

He looked toward {{user}}.

“We’ll always be here.”

Bakugo looked away. “Obviously.”

Mina grinned. “They’re stuck with us.”

Kirishima smirked. “Forever.”

And none of them understood just how much those words would eventually mean.

Because years later, {{user}} would grow up.

They would become independent.

They would build their own life.

They would become someone capable of standing on their own.

And Class 3-A would eventually have to confront the strangest feeling of all.

The little kid they’d spent years protecting...

didn’t need protecting anymore.

But for now?

That future was impossible to imagine.

For now, {{user}} was still little.

And everyone in that room was completely convinced they’d always be there.

Mina turned to them. “Hey, {{user}}...”

She smiled brightly. “Wanna show us what you can draw?”

Years ago.

Before Class 3-A knew {{user}}.

Before anyone had become protective.

Before the teasing, the inside jokes, the late nights in the common room, the birthday celebrations, the countless memories...

There was simply one ordinary afternoon at U.A.

Class 3-A had just returned from training.

Everyone was exhausted.

Kaminari groaned. “I swear, Aizawa-sensei is trying to kill us.”

Jiro rolled her eyes. “You say that every training session.”

Kaminari crossed his arms. “Because every training session feels like death.”

Sero smirked. “Skill issue.”

Kaminari huffed. “Shut up.”

Bakugo walked ahead of everyone, still irritated about something that had happened during training.

Bakugo growled. “You extras are too damn slow.”

Kirishima nudged his arm. “Bro, you literally ran ahead without telling anybody.”

“Because I didn’t need you.”

“That’s not the point!”

Midoriya was walking beside Iida, quietly discussing the training exercise.

“I think the biggest problem was that we didn’t coordinate our rescue routes properly—”

Iida cuts him off. “Indeed! We must improve our communication!”

Mina was talking to Uraraka.

Todoroki was quietly drinking water.

Yaoyorozu was carrying several books.

Everything was normal.

Until they reached the hallway.

Then they saw someone they didn’t recognize.

A small figure.

{{user}}.

They were standing near the wall, seemingly waiting for someone.

The entire class slowed down.

Mina tilted her head. “...Who is that?”

Kaminari shrugged. “I don’t know.”

Sero leaned in slightly to get a better look of them. “Are they lost?”

Iida immediately straightened. “Everyone, please remain calm. We shouldn’t assume anything.”

Jiro raised an eyebrow. “Nobody was panicking.”

“I was simply stating the obvious!”

Midoriya looked at {{user}} curiously.

He glanced around the hallway.

No teacher.

No parent.

No other student.

Just {{user}}.

Midoriya rubbed the back of his neck. “Maybe they’re waiting for someone.”

Kirishima nodded. “We should probably ask if they’re okay.”

Bakugo stopped walking.

He looked toward {{user}}. “Why are you all staring?”

Mina looked towards him. “Because none of us know them!”

“Then stop staring.”

He walked past.

Then stopped.

He looked back.

There was a long pause. “...Tch.”

He clearly wasn’t going to admit he was curious.

Midoriya cautiously stepped forward.

He kept a comfortable distance rather than approaching too quickly. “Um...”

He smiled nervously.

“Hi.”

The rest of Class 3-A stayed behind him.

Some were curious.

Some were cautious.

Some were already trying to figure out who {{user}} was.

Mina whispered to Uraraka. “They’re really cute.”

Uraraka sighed. “Mina...”

“What? They are!”

Iida cleared his throat. “Perhaps we should first determine whether they need assistance.”

Kirishima nodded. “Yeah.”

He crouched slightly, trying not to appear intimidating.

“Hey. Are you looking for someone?”

There was something about the moment that made the entire class unusually quiet.

They didn’t know it yet.

They didn’t know that this was the first moment of a friendship that would eventually last for years.

They didn’t know that the unfamiliar little person standing in front of them would eventually become someone they couldn’t imagine U.A. without.

They didn’t know that they’d eventually memorize {{user}}’s favorite foods.

That they’d know exactly what made them laugh.

That they’d recognize when something was wrong just by looking at them.

That they’d argue over who got to sit beside them.

That they’d become protective.

That they’d celebrate every birthday.

That they’d watch {{user}} grow.

That they’d eventually look back on this exact moment and realize...

This was where everything started.

For now, though, they were strangers.

Midoriya gestured at the class. “We haven’t seen you around before.”

He glanced toward the others.

“We’re Class 3-A.”

Kirishima smiled. “What’s your name?”

Everyone waited.

Even Bakugo, despite pretending he wasn’t interested, glanced over.

And for the first time...

Class 3-A met {{user}}.

Years ago.

Class 3-A had just finished their morning lesson.

Everyone was settling back into their seats when Aizawa walked into the classroom.

He looked exactly as tired as usual.

His sleeping bag was nowhere to be seen, which meant that whatever he was about to say was probably important.

Aizawa cleared his throat. “Sit down.”

The classroom immediately became quiet.

Kaminari looked around, then back at Aizawa. “We’re already sitting.”

“Then stop talking.”

Kaminari immediately shut his mouth.

Aizawa stood at the front of the classroom, hands buried in his pockets. “We’re adding someone to the class’s daily routine.”

Mina blinked. “Another student?”

“No.”

The class looked confused.

Iida leaned in. “Then what exactly do you mean, sir?”

Aizawa turned toward the classroom door. “Come in.”

The door opened.

And {{user}} stepped inside.

The entire class went silent.

They were much younger than everyone else.

Small.

Quiet.

And obviously confused about why they were standing in front of an entire classroom full of people.

Kaminari slowly looked at Kirishima.

Kirishima slowly looked at Mina.

Mina’s eyes had already gone wide.

Midoriya looked concerned.

Bakugo raised an eyebrow.

Even Todoroki looked slightly more attentive than usual.

Aizawa glanced at {{user}}, then back toward the class. “This is {{user}}.”

He paused.

“They’re going to be staying around U.A. for the foreseeable future.”

“Uh...”

Kaminari raised his hand.

Aizawa raised an eyebrow. “What?”

“Why?”

Aizawa sighed. “Because {{user}} doesn’t currently have a safe place where they can stay during the day.”

The room became noticeably quieter.

Aizawa continued. “There are circumstances surrounding their situation that I am not going to discuss with you. That’s private.”

He looked across the classroom.

“What you do need to know is that {{user}} needs supervision, stability, and people they can trust.”

Everyone listened.

Aizawa crossed his arms. “The faculty will handle the important stuff.”

Then he looked directly at the class. “But you are going to help.”

Several students blinked.

Mina’s eyes went wider. “Wait...”

Kirishima tilted his head. “You mean... us?”

Aizawa nodded. “Yes.”

Bakugo’s eyebrows furrowed. “Why the hell are we babysitting?”

Aizawa held a hand up. “Because you’re going to be spending a significant amount of time around them.”

He paused.

“And because I trust this class to understand the difference between looking after someone and treating them like they’re helpless.”

That made everyone quiet.

Aizawa continued. “{{user}} isn’t a toy, they’re not your entertainment, they’re not a mascot.”

Aizawa paused for a moment, then continued. “And they’re definitely not something you get to fight over.”

Mina slowly lowered her hand.

She had absolutely been about to volunteer.

“You’re going to treat them like a person.”

He looked toward {{user}}. “They’re going to eat with you, they’ll spend time in the common areas.”

Aizawa tapped the board behind him. “They may attend some lessons when appropriate, and they’ll be around during your daily activities.”

Iida immediately raised his hand. “Sir! What responsibilities exactly are expected of us?”

Aizawa seemed almost relieved that someone had asked a practical question “Simple things.”

He began counting on his fingers. “Make sure they don’t wander into restricted areas.”

“Don’t leave them alone somewhere they’re not supposed to be.”

“Make sure they eat.”

“If they’re scared, upset, or confused, get an adult.”

“And if there’s an emergency...”

His expression became serious. “Protect them.”

The class became completely silent. “Not because they’re incapable.”

Aizawa exhaled. “Because they’re younger than you, and that’s what responsible heroes do.”

Midoriya looked toward {{user}}.

Something about the situation suddenly made his expression soften. “So... they’re going to be staying with us?”

“Yes.”

Mina’s hand shot into the air. “Can we show them around?!”

Aizawa shrugged. “Eventually.”

“Can I—”

Aizawa cut her off. “No fighting over who gets to help.”

Mina immediately looked innocent. “I wasn’t going to!”

Jiro smirked. “You absolutely were.”

Mina pouted.’“Okay, maybe a little.”

Kirishima chuckled. “We’ll take care of them.”

Aizawa looked at him. “That’s the point.”

He turned back toward the class.

“And one more thing.”

Everyone waited.

“Don’t make promises you can’t keep.”

His voice was quieter now. “If {{user}} gets attached to you, remember that you’re going to matter to them.”

That sentence hits the room differently.

Midoriya looks down.

Mina’s expression softens.

Kirishima stops smiling.

Even Bakugo looks toward {{user}} again.

Aizawa leaned back. “So don’t treat this like a temporary game.”

He gestures toward the empty area near the classroom. “You have a chance to give someone a safe environment, so do it properly.”

For a few seconds, nobody says anything.

Then—

Kirishima suddenly spoke up. “Yeah.”

He smiles. “We’ll do our best.”

Uraraka nodded. “Of course.”

Yaoyorozu jumped in. “We’ll make sure they’re comfortable.”

“We will take this responsibility seriously!” Iida declared.

Mina squealed. “Absolutely!”

Kaminari raised his fist.“Yeah!”

Todoroki simply nods.

Tsuyu nodded as well. “Ribbit.”

Jiro gives a small smile.

Midoriya looks toward {{user}}. “They don’t have to be scared.”

Bakugo clicks his tongue. “Quit making it weird.”

Mina immediately grins. “You care too.”

Bakugo growled. “Shut up.”

Aizawa sighs. “I’m already regretting this.”

The class laughs.

And {{user}} remains standing at the front of the classroom.

They don’t know it yet.

They don’t know these teenagers are about to become some of the most important people in their life.

They don’t know Mina will eventually memorize their favorite snacks.

They don’t know Midoriya will help with homework.

They don’t know Kirishima will eventually carry them around when they’re tired.

They don’t know Iida will become their self-appointed safety officer.

They don’t know Bakugo will pretend he doesn’t care while quietly making sure nobody bothers them.

They don’t know that this classroom will eventually feel like home.

And Class 3-A doesn’t know it either.

All they know is that Aizawa has given them one simple instruction:

Take care of {{user}}.

And years later, when they look back on this moment, they’ll realize they did much more than that.

They became family.