It started like any other quiet afternoon in the Aizawa household: Aizawa had left for a faculty meeting at U.A., trusting his two boys not to burn the house down while he was gone.
“I’ll only be gone for a few hours,” he’d said, with the tiniest hint of doubt in his voice. “Try not to kill each other.”
As soon as the door closed, Souto spun around to face Shinso with a wide, toothy grin.
“You heard him,” Souto said, dramatically cracking his knuckles. “We’re unsupervised. Wanna fight?”
Shinso groaned, sinking deeper into the couch. “No, Souto, I don’t want to—”
Too late. Souto launched himself at Shinso with the enthusiasm of a caffeinated squirrel.
“Take that, villain!” Souto shouted, smacking Shinso with a throw pillow.
“I’m not a villain!” Shinso shot back, catching the pillow mid-swing and yanking it out of Souto’s hands.
“Fine!” Souto darted across the room, grabbing a broom from the corner. “En garde!”
“Oh, come on—”
Shinso barely had time to dodge as Souto lunged at him with the broomstick. It wasn’t that he couldn’t overpower the kid—he could, easily—but Souto had a knack for being unexpectedly slippery.
The next few minutes were a blur of pillows, broomsticks, and overturned furniture as Souto cackled like a maniac and Shinso tried to contain the chaos.
“I swear, if you break something—”
“I’m not gonna break anything!” Souto insisted, mid-swing.
And then it happened.
Shinso dodged a particularly aggressive broom thrust, but Souto came next. His tiny, sharp fangs sinking Shinso’s shoulder— enough to draw blood.
Souto froze, eyes wide as he realized what he’d done. Shinso, on the other hand, was far less calm.
“Did you just bite me?!” he yelled, clutching his shoulder.
“It was an accident!” Souto cried, dropping the broom. “I didn’t mean to—okay, maybe I meant to a little, but not that hard!”
“That’s not helping!” Shinso snapped, glaring at the tiny vampire who now looked genuinely panicked.
Souto fidgeted, clearly torn between apologizing and defending himself. “Y-You’re fine! It’s just a little blood. You’ve got, like, gallons of it in there, right?”
Shinso gave him a flat look.
For a few moments, they both stood there, unsure of what to do. Souto shifted from foot to foot, clearly uncomfortable.
“Okay, okay,” Souto said, finally breaking the silence. “We just... we just need to patch you up before Dad gets home.”
Shinso raised an eyebrow. “You think he’s not going to notice a bite mark on my shoulder?”
“Well, maybe you can wear a sweater?” Souto offered weakly.
“In this heat?” Shinso deadpanned. “Yeah, that won’t look suspicious at all.”
“Alright, fine, new plan!” Souto said, dragging Shinso toward the bathroom. “We’ll clean it up, slap a bandage on it, and tell him you, uh... fell! On a... really sharp rock!”
Shinso sighed as Souto fumbled through the first aid kit. “You are the worst liar.”
“Do you want my help or not?” Souto shot back, holding up a cartoon bandage with little stars on it.
Shinso rolled his eyes. “This is ridiculous.”
---
By the time Aizawa got home, the living room looked like a tornado had blown through it. The couch cushions were scattered everywhere, the broom was propped up awkwardly in a corner, and Souto and Shinso were sitting on the couch, looking suspiciously innocent.
“Boys,” Aizawa said, surveying the mess. “What happened?”
“Nothing!” Souto said quickly. “Everything’s fine! Totally normal day! Right, Shinso?”
“Uh-huh,” Shinso said, glaring at Souto out of the corner of his eye.
Aizawa’s eyes narrowed. “Why are you wearing a hoodie?”
Shinso froze. Souto started sweating.
“It’s, uh... cold?” Shinso offered weakly.
Aizawa stared at him, clearly unimpressed. “Take it off.”
Reluctantly, Shinso pulled off the hoodie, revealing the neatly bandaged bite mark on his shoulder.
Aizawa’s eyes widened slightly. “What. Happened.”
“It was an accident!” Souto blurted out. “We were just playing, and then I kinda... maybe... bit him?”
Aizawa pinched the bridge of his nose. “I leave for two hours–”
“I said it was an accident!” Souto said, throwing up his hands.
Shinso smirked, despite the situation. “Told you he’d notice.”
“You’re not helping,” Souto muttered.
---
After a long lecture about responsibility and self-control, Souto was sent to his room to think about his actions. Shinso got a more sympathetic conversation, along with a reminder to set better boundaries during their “playtime sessions.”
As Aizawa finally flopped onto the couch with a tired sigh, he heard a muffled shout from Souto’s room.
“For the record, I won that fight!”
“No you didn't!” Shinso yelled back from his own room.
Aizawa groaned, leaning back against the cushions.
...
Thank you.
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BNHA | A Bite-Sized Problem
Fanfiction.ᐟ Comic relief / Slice of life. Eraserhead, pro hero and notorious insomniac, adopts an 8-year-old vampire delinquent with an attitude problem? Chaos, that's what. Souto, a loud, abrasive troublemaker with a biting temper (literally), finds himself...
