AN: I don't own MHA

This is stupid

"Ok, given everything we know. I think I knocked it down to three theories," a young boy with dual coloured hair started to explain, while slapping a tiny hand on the pinned poster paper. He had worked tirelessly to create it. Sure, it was lopsided, filled with spelling errors, wonky lines that go all over and crude drawings, but he still put a lot of effort into it. Days of careful gluing, web surfing, and trying to clean the paint stains off his carpet. Those stains are still kind of there. Don't tell his mother, and never move that awkwardly placed bin. It lives there now.

Like a teacher on their first day, Shoto pointed to one section tilted: theory 1. Below it was a drawing in crayon of two people. One was a woman outlined in green with a wide smile. She was made extra pretty with glitter and a painted flower crown. The other was a rough outline of a man with a frowny face. They were scoring some devil horns and tail. Both were sitting on what looked like swings while the rest of the background was a genetic green grass and blue sky. "They were childhood sweethearts. Rip away by different choices only to be brought back together by the thread of fate. Sparks ignite into a passionate moment ruling into two babies that don't look the same. Due to one of them being married they were forced apart again. Taking one baby each."

The begrudging student of this unwanted lecture was another young boy with explosive blonde hair. He was Katsuki and they were…a friend? Kind of. A very reluctant one. The boy glared at the other with the most unimpressed expression. "That is stupid," he spat. He doesn't know why or how he ended up here. He just knew this was stupid, and he rather be anywhere else. But he has no doubt the old hag will give him an earful. He had taken enough of her crap today, so he was stuck here. "First off, auntie never went to U.A, and she brag about how that guy was home schooled until U.A. How you didn't find that info in your 'in-depth' research is beyond me. That and auntie went to the same schools as my old hag. Billions of miles away from U.A. No way she could have even crossed paths with that guy. Also, you and this Izuku kid have different birthdays. Explain that sherlock!"

Katsuki had a point. Unless that flame meanie lied about their birthdays to hide the truth! Still, he has a couple more to throw out there. "Ok next one." His finger pointed to theory two. The crudely drawn man and woman were back again this time in a different setting. There was a night-time shy pained above them and a table between them. A couple of glasses were pasted on with stick crayoned arms. "A night out resulted in a night of accidental passion. They tried to resist each other and forget about their mistake, but they couldn't. They looked for each other again and again. Had one child as a result. And another soon after."

"Do you even know how pregnancy works?" The explosive boy hissed. His temper fuse was getting shorter the longer he felt he was losing brain cells. How did this princely brat come up with this nonsense? Then think it was possible. "You're stuck in there for like 9 months before coming out kicking and screaming. You are a few days apart from that broccoli head kid. No way that's even possible." He yelled as if everyone should know this stuff. It's like basic knowledge. "Also, auntie hates drinking. You know this."

Once again, they had a point. His mama never liked drinking or going out at night unless she has to for work. He doesn't like it when she's out late either. Often seeking out of bed and waiting outside their door to make sure she comes home. Usually, auntie Mitsuki finds him first, but he could sometimes convince her to stay with him. They'd end up on the couch watching late night dramas waiting for her. Even if he could never stay awake late enough to see his mother come home. He'll always be greeted by her tired smiling face. He wished he could grow up faster so he could help her. Then she'll never have to work at night again. And then they could cuddle and read stories before bed like they used to.

Still, he had one final theory. It was a long shot, but it was something. He slammed his tiny hand at the final section: theory 3. There was a picture of two babies in swaddles. One outline with green and had scribbles for hair. The other is red with a little bit of white. Mainly on one half of its head. There were arrows curving into opposite directions pointing to two awaiting hands. One was red and chunky. Almost monstrous design. The other was green with a slenderer from. "We've been swapped from birth! Either the doctors made a miss print somewhere or some malicious actions were in play." The child said with such conviction. His eyes glared at a cut-up image of the flame hero as he bit his lip angrily, "most likely from that fire jerk." He was so sure of himself on one thing. He wasn't sure how or why, but he knew somehow that man was to blame for everything.

Katsuki stared up at the boy with an expression that could only be described as: 'you're fucking with me, right?' but he knew the boy wasn't. He could see it in their eyes that they were dead serious. And then thinks he'd nod obediently and believe him. That made him even angrier. His fuse was at its end, and he exploded: "You've been watching way too many of my old hag's fucking dramas!"

There was quiet between the two boys. They stared at each other intensely. It wasn't long until Shoto smirked smugly, and the Katsuki realised he made a mistake. Quickly, he covered his mouth, but it was too late.

"Pay up," Shoto said sickly sweet while holding up a large jar. There was a rough piece of paper taped to the side named: Katsuki's swear jar. It was already half full of loose coins.

Pouting, Katsuki crossed his arms with a huff and turn away from the Jar. Damn his old hag. He knew the witch only gave him a hefty allowance because of that damn jar. Every time he says a bad word, he'd be forced to give some of it up to fill the jar. All of the earnings would then go to the stupid prince to use for whatever his self-righteous ass wanted. It's not his fault he had a potty mouth. The hag should look at the mirror. There she'll find the culprit. She should have a swear jar or her own. It would fill up just as fast.

"Don't make me tell auntie Mitsuki," Shoto warned while shaking the jar.

Katsuki hated that rattling sound. It was like a taunt. Well, it was a taunt but unlike most taunts, he can't punch back without getting an earful from the old hag. Then get grounded. That innocent prince act didn't help either. Growling, he fished out a coin from his pocket and dropped it in the slit.

Keeping his innocent smile, Shoto happily shook the jar. The rattling of the coins was truly a happy tone. "A couple more and I can buy mama that pretty vase for the flowers."

"You and your fucking flowers," Katsuki hissed under his breath, hoping he wasn't heard. Unfortunately, he was since the jar shook in front of his face again. There goes another bit of his allowance.

"Thank you for paying for them, Katsuki," Shoto sang far too sweetly for the other's liking.

The throbbing in his head grew ten times stronger. It's a wonder it didn't explode with his growing blood pressure. Angrily, Katsuki fished the rest of his dwindling allowance and stole the jar. He opened his mouth without regrets: "Why are you so fucking hung up on this away? Auntie Inko calls you, her son. Why question it? And who cares who your dad is? Whether it's the flame asshole or not. And isn't your dad's name Hisashi or whatever? So there goes more fucking holes, you dumb prince." There go two coins. "You never use to care about this shit before." And another. "It could all be a coincidence. White hair runs in your family. And green isn't that rare either. Your conspiracy theories are fucking as hell dumb." Luckily, he was able to sacrifice one last coin for his rant the shoved the jar back to the other boy. He had enough of this bullshit.

It didn't use to be like this either. Katsuki may be a kid, but he wasn't stupid enough not to notice how weird the duel-coloured haired boy was acting recently. Auntie Inko too. Neither of them cared much about heroes. Or talk about the old man that left them since it became a taboo topic for the two families. Then they recently got hung up about that number two hero. Always flipped to the news channel if he was on. Checking news updates about him and that adopted kid of his. Auntie Inko wouldn't shut up about them. Then there was Shoto who came up with wild theories that sounded like plots from overdramatic dramas. He doesn't know why they were so focused on the guy. All Might was so much cooler.

For a moment Shoto's smile dropped. Tightly, he held the jar to his chest and avoided the other boy's sharp eyes. He'd never understand. "It's just…" he thought back to a conversation he had over a couple of weeks ago. He didn't hear all of it, but he did hear something that shook his heart.

'That's your son. Don't you want them back?'

"I've been thinking about it a lot recently." Unconsciously, he griped his red hair so tight some stands ripped out. He hated his red hair. It made him feel even more disconnected from his mother. Then there's that other boy. No matter how you look at it, they looked more like her son than he did. Meanwhile, he looked a lot like... The thought made him anxious, although he wasn't sure why. There just had to be a connection somewhere. Some twist that he was her son all along. Otherwise…

What right did he have to be called her son?

AN: admittedly this was an extra that just happened. I was working on a different event. I blame the Shoto conspiracy meme. Also note Shoto would be around 4-5 at this point.

Guest – well it's the start of them being regular pen pals. It's still going to be awhile until the official cross of paths. Mainly since they live such different lives in different areas. But that will change one day I just have a few more things to set up for that to happen.