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2022-05-16
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The Chaos That Comes with Having a Younger Brother Who’s a Little Shit

Summary:

Aizawa Shouta was a mystery to his class, no student he has ever had has known much about him. So, when Hizashi bursts into his class while he’s in the middle of Homeroom screaming about his brother getting arrested for vandalism his class goes into shock, because there is way too much to unpack from that single sentence.

Midoriya Izuku is having way to much fun causing Chaos in Class 1A.
Aizawa Shouta is just done with his brother's shit.

Notes:

(See the end of the work for notes.)

Work Text:

Homeroom was going well, the students weren’t trying to kill each other (well some weren’t, Aizawa wasn’t so sure about Bakugou yet), Aizawa had his coffee, and he was relaxing as much as he could with the constant talking that came from his class. Homeroom was almost over, freedom from this hell of a class was so near, when Hizashi just had to burst into his class and ruin it all.

“Shouta!” Hizashi yells scaring the shit out of all of his class. He was panting and there was a slight shine of sweat on his forehead.

Aizawa simply open his eyes and glared at his overly loud husband. “What?” He snaps with no real venom.

“Your brother got arrested,” Hizashi pants. “And I think he might be getting sued!”

This idiot, he just had to say brother. Why could he had said something else? Now he was going to have to deal with the class’s stupid and non-stop questions. Aizawa pushes himself out of his sleeping bag with a sigh.

“Are you being serious?” Aizawa grunts.

“Yes,” Hizashi huffs. “I would never lie to you. He’s waiting for you in Nedzu’s office.”

“Okay,” Aizawa sighs. “Watch the Hellions.”

Aizawa says nothing more and leaves his classroom as quickly and calmly as possible, leaving his sleeping bag under his desk. He can feel the eyes of his class on him as he leaves.

The class was chaos as soon as he was gone.

 


 

Izuku was a smart kid, he knew this. He thought everything out before he did it. He planned things with careful and thorough precision. He sometimes took weeks to prepare things fully. He had back up plans, back up plans for back up plans, and back up plans for those back up plans. And it was rare that one of his plans failed completely.

Which is why it was a shock to him when he actually got caught while defacing Endeavors agency. He had been planning this stunt for nearly a week, had so many back up plans and ways to cause the most not very serious damage to the place. Hell! He even got help from Endeavors supposedly dead son and his other still alive sone (the one his half red and half white hair). He did not want this plan to fail at all.

And yet it did. And now he was getting sued. Well, his vigilante side was getting sued, not Izuku.

Fuck, Shouta was going to kill him. Mom was going to kill him. Dad would probably high five him. Nedzu would cackle as he watched it all play out. And Hizashi would scold him before laughing with him at the pictures he managed to get of Endeavors reaction.

But none of those last three people mattered, because the two most admittedly scary people in his life would either kill him or ground him until he was a million years old.

There were many times when Shouta found out what he did as a vigilante and scolded him hard enough to give him third degree burns. Then he would smack him across the back of the head. Only after all of this would he make sure Izuku wasn’t severely injured.

But none of that compared to his mom. Because she would just send him a sad disappointed look that he could never avoid. She would also sometimes cry, Izuku hated seeing his mom cry, it made him want cry.

So all of this is why, as he waited for the his two personal deaths to come and pick him up from Nedzu’s office (The Rat God had saved him from being burned alive by Endeavor in the man’s absolute rage), he debated whether or not it would be a good idea to just run and hide with dad. He eventually decided against that because with mom and Shou’s combined power they would find him in thirty minutes.

He needs to hide the gun and knives he stole while he still can. They can not find him with them.

So Izuku waited not at all calmly for his brother and mother to come collect him.

The door to Nedzu’s office opens. Izuku takes a deep breath and closes his eyes.

“What the hell did you do, Problem Child?” Shouta demands. Izuku can feel his eyes burning into the back of his skull.

“Ah! Glad you could come so quickly Aizawa kun!” Nedzu says cheerfully. “Have a seat. Would you like some tea?”

“No thank you,” Shouta says quickly.

Izuku turns to his brother, a shit eating grin hiding behind a nervous one. Because no matter how much he feared his brother when it came to things like these, he couldn’t stop the pride he felt whenever it came to ruining Endeavor’s career and destroying the man’s belongings.

“I defaced Endeavor’s Agency,” Izuku states, hoping his prided didn’t show. “He’s suing vigilante me.”

“That’s it?” Shouta asks. “I thought you had at least burned a building down, at most murdered someone.”

“I wouldn’t murder someone!” Izuku exclaims taking major offense that his brother would ever think he would.

Shouta raises an eyebrow and crosses his arms over his chest.

“I wouldn’t murder most people,” Izuku amends.

Shouta’s eyebrow raises even more.

“Fine! I want to murder most people but I have self-control?” Izuku tries for a final time.

“That’s close enough,” Shouta says.

“I don’t believe you would have gotten him to say any more than that,” Nedzu agrees.

Shouta and Izuku stare at each other.

“So,” Izuku starts slightly nervously. “Are you upset with me?”

“No, Endeavor’s an asshole,” Shouta says. “Though, I’m disappointed that you got caught.”

“Yes, I do believe that you need more stealth training when it comes to quirks like Endeavors,” Nedzu muses.

“Me too!” Izuku exclaims. “I planned it so well, and I even had help. And yet I didn’t calculate the fact that Endeavor could come back from his meet and greet early. Very idiotic on my part.”

“Endeavor was the one that caught you?” Shouta asks, Izuku can see the worry building in the man’s eyes. “I thought it had been one of his sidekicks.”

“No,” Izuku says mournfully. “I wish though.”

“Are you hurt?” Shouta asks seriously. “I know that man practically hates vigilantes.”

“Not really…” Izuku begins before being cut off by Nedzu.

“Izuku kun has first and second degree burns on his arms and back,” Nedzu says in his usual, cheerful voice.

Shouta levels Izuku with a deadpan look. “Not really huh?” Shouta sighs. “You do know that it’s illogical for you to hide injuries. It could affect your future performance, and danger you and other people on the field.”

“Yeah, yeah,” Izuku huffs with a slight pout. “You tell me that all the time.”

“Because it’s true,” Shouta argues.

“But it’s not even that bad,” Izuku argues.

“While this is a very enjoyable conversation to watch,” Nedzu cuts in before Shouta could reply. “I do believe it would be best if Izuku kun visits Recovery Girl.”

Izuku’s face drops as he remembers the third person on his scary people list.

“Is—Is that really the best idea?” Izuku chuckles nervously.

“Yes, it is,” Shouta says. “Come one. You are either coming willingly or I’m dragging you through the school.”

“Fine,” Izuku groans. He’s up and, as slowly as he can, walking out of Nedzu’s office when an absolutely beautiful plan pops into his brilliant mind.

“When we see anyone, I want you to pretend I don’t exist,” Izuku says a glint in his eyes.

“What are you planning Problem Child?” Shouta asks.

“Nothing too bad,” Izuku smirks.

“Dear lords,” Shouta sighs. “Forgive me if I don’t believe you.”

“I’m just going to use the fact that we look similar to my advantage,” Izuku shrugs.

Shouta sighs for what had to be the 100th time that day. It felt like today would never end.

 


 

Mina was the first person to spot Izuku and Aizawa together.

She had been going to meet Bakugou, Sero, Kirishima, and Kaminari at lunch after having quickly changed her tampon when she spotted them. She had thought she was seeing things at first, but after blinking furiously for a few seconds, pinching herself a few times, and rubbing her eyes she was sure she wasn’t. That was definitely Aizawa Sensei and a mini Aizawa Sensei.

The only real difference between them were their eyes and their clothes, and mini Aizawa Sensei had freckles. Her Sensei’s eyes were black while the mini Aizawa’s were a bright emerald green.

Mina jumped out of her skin when she noticed that both of the Aizawa’s were staring back at her.

“Do you need something, Mina?” Aizawa questions blank faced as always.

“No!” Mina yelps. “I was just wondering who that kid is?” Mina points to mini Aizawa.

The kid’s head snaps to her, their eyes wide and shocked.

Aizawa’s eyes glance quickly around the hall. “What kid?” Aizawa asks.

“What do you mean?” Mina asks confused. She gestures semi wildly to mini Aizawa. “That kid.”

“You can see me?” mini Aizawa asks hopefully.

“Of course, I can,” Mina rolls her eyes.

“Who are you talking to?” Aizawa asks glancing around again.

“Them!” Mina Exclaims.

“Mina, I really do not have time for your pranks,” Aizawa sighs.

“But,” Mina says desperately.

“You have to listen to me,” mini Aizawa says quickly and desperately. He had a pleading look on his face as he continued. “That is not the real Aizawa—”

“What do you mean?” Mina asks.

“Don’t cut me off, please,” mini Aizawa pleads. “I really need you to listen. I’m the real Aizawa. That one’s a fake! He—He killed me and took my place!”

“But you don’t even look the exact same!” Mina says.

“Exactly!” Mini Aizawa says. “That’s how you can tell the difference! You have to tell your class! Please, I don’t want anyone else to get hurt.”

“I—okay!” Mina says. She foes to leave looking at Aizawa fearfully. “B—Bye Aizawa Sensei!” She squeaks out as she dashes off and around the corner.

“What the fuck have you done?” Aizawa demands horrified. “How did you convince her so easily?”

“Completed the first part of my master plan,” Izuku cackles.

“I already hate this plan,” Shouta states.

“The you’ll hate it even more once I’m finished,” Izuku smirks.

Shouta slumps and sighs, this was going to be a long day.

 


 

Kirishima Eijiro was the second victim to Izuku’s master plan. He had been exiting the library when he spotted Shouta and Izuku together.

“Aizawa Sensei!” Kirishima calls out jogging over to his teacher.

“Yes, Kirishima,” Aizawa says.

“Who is the kid with you?” Kirishima asks. “Mina came running into lunch talking about how you’re a murderer and that, that kid was the ghost of your victim.”

Aizawa stares at Kirishima. “There’s nobody with me.”

Izuku stares at Kirishim with a blank, dead, face. “I’m the pope who died in the desert while walking his fish in the snow.”

“Wh-what?” Kirishima says completely baffled.

“I died tomorrow on the May eve of 1982,” Izuku continues still deadpanned.

“I—Huh?” Kirishim says.

“Beware of the twiddle sticks that eat snow globes under your dog next yesterday,” Izuku says. He jumps into a vent on the wall and as he’s leaving, he says, “Praise Bingus.”

“Kirishima?” Aizawa calls.

“Huh?” Kirishima’s head snaps to look at his sensei. “What?”

“I asked why you weren’t in class,” Aizawa says.

“Oh,” Kirishima mumbles. “I was just, uh, going there.”

 


 

Todoroki was Izuku’s next victim.

Izuku runs frantically up to Todoroki, the half and half boy watches him curiously as he does. Izuku grabs the other boy’s shoulders roughly and makes him look him in the eyes.

“I’m Aizawa Shouta’s future secret love child!” Izuku shouts quickly.

“What do you mean future?” Todoroki asks.

“I’m from the future,” Izuku says seriously.

“Really?” Todoroki asks with slight amazement.

“Yes,” Izuku says still very serious. “I need you to warn my father not to drink that cup of coffee! Please! The fate of our win in the Great Second Galactic War depends on it!”

“Okay…” Todoroki says slowly. “Which coffee?”

“You’ll know,” Izuku says before jumping backwards into a vent.

Todoroki stares silently at the vent for a while, not really sure what to do. His decision was made for him when he spots Aizawa walking by him tiredly with a cup of coffee in hand. Todoroki’s eyes widen and he slaps the cup out of his sensei’s hands without a second thought.

“What is wrong with you?” Aizawa demands staring down at the poor cup of coffee now on the floor with a horrified expression. “That was a perfectly good cup of coffee.”

“Your future secret love child asked me to not let you drink the cup of coffee,” Todoroki states. “I’m not sure if that was the cup of coffee though.”

Aizawa sighs. “I’m going to get another cup of coffee.”

“But sensei!” Todoroki exclaims. “The fate of the win of the Great Second Galactic War depends on you not drinking the cup of coffee.”

“I don’t give a fuck,” Aizawa glares. “Let us all die.”

“Sensei!” Todoroki says shocked as he chases after the tired man.

Deep in the vents Izuku is laughing his ass off as he watches his brother run from one of his students.

 


 

By the time Izuku was done with 1A he had Mina believing Shouta was a fake Aizawa and a murderer and he himself was the real Aizawa’s ghost. Kirishima didn’t really know what to think of him, just that he was a Pope that walked his fish in a snowy desert and died while doing it, and he worshiped something named Bingus. Todoroki was convinced Izuku was Shouta’s secret love child from the future, and was still slapping cups of coffee out of his teacher’s hand.

Kaminari thought he was a cyborg sent to destroy UA from the inside and infest everyone with nano tech and take over the world. Tsu thought he was a fellow frog person; they were planning the frog apocalypse together. Sero thought he was a runaway prince from Russia who ran away with the dream to become a hero and king of all rats.

Uraraka thought he was a banshee that only she could see (he literally only screamed after telling everyone around him to just ignore him and pretend he wasn’t there). Iida was convinced he was a statue that could tell the future to any who payed him ten bucks. Momo thought he was 3H, that was all he knew he could get her to believe. Aoyama thought he was supreme god of glitter and anything French.

And Mineta just knew him as the person who could and would kick him in the balls every time, he even looked at a girl the wrong way. Izuku honestly had so much fun with that. He’s never been able to kick someone so many times in the balls before.

Izuku didn’t get have anymore time that day to mess with the rest of the class, sadly. He did get to mess with Kaachan thought, mainly just spilling a lot of secrets to the bakusquad about him. That was so fun.

All in all, it was a great day. He was sad when he learned that he was going to have to officially introduce himself to 1A the next day. But at leas he got to have his fun before having to face his mom at dinner. Hopefully Shouta would help him with that. He probably won’t but a boy can always hope.

Notes:

Ah, my first fanfic for the mha fandom. Glad I finally got around to it. This was very fun to write. I love crack fics very much and I’m glad I can add to the tag.

Shouta doesn’t give any shits about what Izuku does to Endeavor, only that his brother got caught. Izuku can and will use this to his advantage in the future. Now Izuku is a cryptid to 1A, they all fear him. Except Aoyama who worships him, but that just makes the rest of the class fear him more.

Aizawa sigh count: six. But those were only the one that you saw. He sighed many more times than that.

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