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Or: That Time UA Regretted Letting Her Out of the Infirmary
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1. The Great Kitchen Fire (That Technically Wasn’t Her Fault)
It started with a simple craving: pancakes.
It ended with the fire alarm going off, Sato screaming, and Y/N standing on the kitchen counter fanning smoke with a cutting board.
“I said I knew what I was doing!” she yelled over the alarm.
“You poured orange juice in the pan instead of oil!” Sato cried.
“I was improvising! It’s called culinary jazz!”
The microwave exploded.
Present Mic kicked the door open in his pajamas. “WHO SUMMONED ME WITH CHAOS?”
“I DIDN’T EVEN GET TO FLIP ONE,” Y/N wailed.
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2. The Invisible Wall Incident
Hatsume had been testing a new tech that projected invisible energy barriers.
Y/N, naturally, ran into it face-first with the force of a charging rhino.
“OW. WHY IS THE AIR HARD?!”
“You walked into the new prototype,” Hatsume said cheerfully.
“You should’ve put up a sign!”
“It’s INVISIBLE.”
“I’m suing you for emotional damage and nose betrayal.”
The class watched her dramatically slide down the force field like a tragic soap opera character, leaving behind a forehead print on the invisible wall.
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3. That Time She Thought a Villain Was a Cosplayer
It was during a field trip.
Y/N wandered off. (Again.)
She came across a guy in a full villain outfit, mask and all, standing ominously in an alley.
“Ooh, your cosplay is AMAZING,” she said, circling him. “Is this original? Or based on some underground manga?”
The villain, confused, hesitated. “Uh… I’m robbing a store.”
“WOW, dedication to the bit!”
“I literally just set a building on fire.”
“You’re really selling it! I can’t even tell if you’re method acting or—WAIT, IS THAT A REAL KNIFE?!”
She came back five minutes later, singed and out of breath.
“Okay so plot twist, that was not a Comic Con side quest.”
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4. Her Deep, Emotional War With the UA Vending Machine
She was one yen short.
Just. One.
Y/N smacked the machine. Sweet. Nothing.
She begged. It ignored her.
She yelled, “I HAVE SUFFERED FOR THIS SNACK, GIVE ME MY SALTY JUSTICE!”
Bakugo walked by, slapped the machine once, and it coughed out not only her chips, but a second bonus bag.
“I loosened it for you,” Y/N muttered.
Bakugo didn’t even stop walking. “You’re pathetic.”
“I’M THE PEOPLE’S CHAMPION,” she shouted after him, holding both chip bags above her head like trophies.
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5. The Time She Tried to “Train” the Dorm’s Pet Turtle
Someone brought a turtle back to the dorms. Bad decision. Y/N decided it had “hero potential.”
She built it a cape out of a sock, taped on a cardboard mask, and named it “Shellshock.”
“Today, we conquer the common room,” she whispered to it dramatically.
She tried to make it do laps in the sink.
It turned around and pooped on her hand.
“This is betrayal,” she whispered, looking into its eyes.
Shellshock blinked. Unbothered. Unapologetic.
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6. Late Night Philosophy (A.K.A. Sleep-Deprived Chaos)
2:39 AM. She wandered into the lounge in fuzzy slippers, wrapped in a blanket, holding a spoon.
Not eating. Just holding it.
“Do you think All Might ever stubbed his toe in his buff form and cried in his skinny form so no one would know?” she asked Kaminari.
“...Go to sleep.”
“Do frogs know they’re frogs?”
“Y/N.”
“Do we all technically taste like chicken?”
“Y/N, PLEASE.”
Pairing: Bakugo Katsuki x (platonic) Chubby Little Sister OC
Tags: sibling vibes, soft moments, light bullying, Mitsuki being a mom, grumpy x sunshine
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“You’re seriously making me babysit her?”
Bakugo’s scowl could’ve cracked concrete. Arms crossed, eyes twitching in irritation, he stared down at the chubby little girl peeking out from behind his mom’s legs.
Mitsuki rolled her eyes. “She’s your sister, Katsuki. And I have errands. You can either watch her or listen to me scream for an hour. Pick.”
He groaned like he was being sentenced to death. “She cries all the damn time.”
“I do not!” she squeaked, voice breaking halfway through. Her round cheeks were already turning pink, her hands clutching the hem of her too-big t-shirt. “You’re just mean!”
“And you’re a crybaby,” Bakugo snapped, already turning toward the living room. “C’mon, Baby Bear. Let’s get this over with.”
She blinked. “Baby… bear?”
“Yeah. Round, soft, and whiny. Don’t get snot on the couch.”
---
At first, she avoided him—tiptoeing around, too scared to even ask to change the channel. Bakugo ignored her just as much, only occasionally tossing a jab like:
“Stop stomping, you sound like a baby Godzilla.”
“Why are you always eating something?”
“Don’t look at me like that, I’m not gonna cry with you.”
But Mitsuki kept forcing them together.
Board games. Movie nights. Grocery trips. He even got roped into walking her home from school once.
And slowly—very slowly—things shifted.
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She started sitting closer.
He stopped rolling his eyes when she talked.
She’d bring him little snacks she made (badly).
He’d ruffle her hair when she got nervous.
And when she got picked on at school for her weight?
Bakugo showed up the next day, leaned on the classroom doorframe, and said loud enough for everyone to hear:
“You mess with my sister again, I’ll turn your desks into kindling. Got it?”
She didn’t cry that day.
But she did tell him he looked cool.
And for the first time, he only called her “Baby Bear” once that whole day.
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Summary: Reader’s stubbornness kicks back in, and the adults are not having it
The hospital room was too white.
The walls. The sheets. The buzzing light. It all made your skin crawl. Even worse was the IV line in your arm—a clear tube taped down to your skin like some parasite, slowly dripping fluids into your veins like you were a broken plant.
You glared at it like it had personally insulted you.
You had been stable for two days. That’s what they said. “Stable,” whatever that meant. You still felt like garbage. You couldn’t walk more than five feet without your knees giving out. But that was beside the point.
The point was the IV.
Disgusting. Cold. Invasive. You hated how it felt inside your arm, like an itch you couldn’t scratch. Every few hours a nurse would come by and adjust the bag, and you had to just sit there like a helpless child. It made your skin crawl. You weren’t even scared of needles, not really—it was the being plugged in part that made your chest tight.
And honestly?
You were done.
You looked toward the door. No nurses. No heroes. The hallway was quiet. Probably lunchtime.
You glanced down at your arm.
“This is a terrible idea,” you muttered under your breath.
Then you yanked the IV out.
It came free with a squelch and a tiny spurt of blood, and you slapped your hand over it with a hiss. “Ow, ow, ow—grossgrossgross—”
A few drops of saline hit the sheets as the IV line swung freely like a limp vine. You shoved it aside like it was cursed, pressing a tissue to your bleeding arm.
You felt instantly better.
But the second you relaxed, the door opened.
“…What the hell are you doing?” Aizawa’s voice cut through the air like a whip.
You flinched.
“I was—uh,” you started, hiding the bloody tissue behind your back. “Nothing?”
He strode over in three long steps, eyes scanning the scene. The IV was dangling. The bandage was slipping. Your arm was still dripping faintly.
“You pulled it out?!” he barked.
You winced. “It felt gross, okay?! I’m not a science experiment—!”
“You’re a hospital patient,” Aizawa snapped, grabbing a clean cloth and pressing it to your arm. “This is here to keep you alive. You don’t get to decide to sabotage your care because it’s ‘gross.’”
“I didn’t sabotage anything!” you protested. “I’m just—ugh—it’s my body, let me have some say!”
“You lost that say when you let your body fall apart,” he shot back.
You went quiet.
Aizawa immediately regretted his words. His eyes softened, and his voice dropped. “…I didn’t mean it like that.”
But the silence between you stretched like a cracked window.
“I just…” you said after a while, voice small. “It made me feel like I wasn’t even in control anymore. Like everyone’s poking me and watching me and I’m not even—me anymore.”
Aizawa let out a slow breath. “Okay. Okay. I get it.”
You blinked. “You do?”
“I do,” he nodded. “But that doesn’t change the fact that this is still serious. You need those fluids.”
“…What if I drink more instead?” you offered weakly. “Like, a million electrolytes. And juice. And water. I’ll turn into a human Capri Sun.”
Aizawa gave you the driest look known to man.
“I’m being reasonable,” you added.
“You ripped a needle out of your arm.”
“...Emotionally reasonable, then.”
Before he could reply, the door burst open.
Midnight stormed in, Recovery Girl behind her.
“What happened? The monitor started freaking out—oh my god, what did you do?!” Midnight gasped.
“She pulled out her IV,” Aizawa said, tone flat.
Recovery Girl looked like she might combust on the spot. “You what?!”
“It felt gross!” you shouted, holding your arm like a wounded kitten.
Midnight clutched her head. “You’ve been in this hospital for two days and already started acting like an escaped gremlin.”
You huffed. “I wasn’t escaping. I was... asserting autonomy.”
Aizawa held up the bloody cloth. “With blood loss.”
Recovery Girl marched over and sat you up straighter with surprising strength. “If you do that again, I will have someone sit on you. Understood?”
“...Kinky,” you mumbled.
“What was that?”
“Nothing.”
“Mmhm.”
Midnight crossed her arms. “Do you hate the needle part or the ‘hooked up to something’ part?”
“…Both,” you admitted. “But mostly the hooked up part. It’s like I’m a USB stick.”
Recovery Girl pinched the bridge of her nose. “Fine. We’ll switch you to oral hydration and supplements if your blood pressure stabilizes over the next 12 hours. One more dip and you’re getting a double IV.”
You shivered. “Fine. Deal. Oral hydration or death.”
Midnight raised an eyebrow. “Dramatic much?”
“You’re literally talking to someone who steam-bleeds and passed out running down a hallway,” you said, deadpan. “Dramatic is my brand.”
Aizawa exhaled. “I’m too tired for this.”
“I’m tired, you’re just tired of me,” you teased.
He didn’t even crack a smile.
Midnight walked over and ruffled your hair. “Let’s just try to keep the holes in your arm where they belong, yeah?”
You nodded. “No promises.”
“Reader.”
“Okay, okay—I’ll be good. Kind of. Mostly. I’ll aim for like... 70%.”
Midnight looked at Aizawa. “That’s the best we’re gonna get.”
Aizawa just rubbed his temples again.
Class 1a
Bakugo
"The disaster talk"
They watched the video
The truth bomb
Family Dinner (aka the acacolypse)
The Janitor’s Closet incident
Explosive Delivery
Explosions of the heart
Thin Walls- no restraint
Red Marks red faces
No Time Like a Bad time
Explosive Love: Part 2 – Babysitter Bakugo
Kirishima
Red Riot meet your Sidekick
Explosive Love (Literally)
Deku
In his arms
Explosive Love: Part 3 – Baby's Day Out (with Deku & Todoroki
Sero
Explosive Love: Part 5 – Sero & Denki: Bros vs Baby Bom
Denki
💛 Static hearts
Explosive Love: Part 5 – Sero & Denki: Bros vs Baby Bom
Shoto
Explosive Love: Part 3 – Baby's Day Out (with Deku & Todoroki
More to come!
Girls
Uraraka
Jirou
Momo
Tsuui
Mina
Explosive Love: Part 4 – Mina’s Turn (And She’s Ready for War)
Hagakure
More to come!
Pro heroes
Boys
Present mic
Aizawa
“Head Trauma? Never Heard of Her”
Hawks
Just a Flesh Wound bro
"First Flight"
“Hero Duty Never Sleeps”
More to come!
Girls
Midnight
“Head Trauma? Never Heard of Her”
Mirko
Mt. Lady
Just a Flesh Wound bro
More to come!
Villains
Boys
Shigaraki
Dabi
Twice
Overhaul
Girls
Toga
Magne
Lady nagant