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From ages zero to six, Izuku and Katsuki were inseparable. Izuku would beg his mothers to visit the Bakugo household whenever he could and they would only agree to go somewhere if the other was going and they never ever did anything without telling the other about it.
Yet, when the time for their quirks to cme in and Izuku's didn't, they stopped hanging out. Stopped begging their mums to see their best friend, stopped having sleepovers, stopped hanging out in the playground- just stopped.
However, it didn't stop the mums from meeting up. They were still best friends and they needed a social life outside of their children and their playdates.
So despite the boys not being friends anymore, Katsuki was always in the Midoriya household for their Saturday plans.
Every.
Single.
Saturday.
And it wasn't like they would just stay in the house- no, their mums would force them to go to all sorts of places and then go back home to have dinner and watch a movie.
It was a routine. Katsuki dreaded every single saturday
By the time they were eight, they stopped complaining about it to their mums and started going along with it. They knew by now there was no escaping the Saturday plans- no matter how much work they had- so an unspoken truce was called for that they would be civil with each other. (not that either boy would admit that they were friends)
They had come up with a certain method for how they were going to live their lives and it worked.
Friday they would do all their work, homework and anything else that needed doing. Then Saturday they would get up early and get ready for whatever adventure their mums forced upon them that week.
Sometimes, they just stayed home and ate out and watched movies that were far above their age group that their mums didn't mind them watching and they laughed and had fun together. Days like these were their favorite (not that anyone needed to know)
Much to their shock, by the time they were eleven their mums just stopped meeting up as often.
After years of complaining- they had just stopped and said they were too busy to meet up as often. Mitsuki had a fashion empire to build and Inko had case after case to finish.
Something in the boys told them that they didn't want to stop it. That they didn't want to stop meeting the other but now they would have no excuse.
It was Izuku who broke their spell of silence. He went to the Bakugo household one afternoon when he stammered his way through explaining that he needed help with math. His excuse was that kachan was the best in their class in math so Mitsuki let the boy in with a small smile. Without asking for any help, Izuku instinctively walked into Katsukis room and they started studying.
Katsuki would help with math while Izuku could help with English, thanks to his dad forcing it on him, he was fluent.
At some point, their study sessions had shifted into hanging out when Katsuki brought up the idea of seeing the new All Might movie. At that Izuku smiled and waved goodbye to auntie Mitsuki and dragged Katsuki to the closest cinema.
It was an unspoken rule that Saturdays were their days.
When they could act however they wanted and let down their guard. When they could laugh and joke like they used to.
When they were Kacchan and Zuku and not Bakugo and Deku anymore.
1.
When they got into UA, they congratulated each other tensley during the week but only Saturday did they open up about how nervous they were. How Izuku broke three of his limbs and how much it hurt went unstated but it was brought up how little control Izuku had with his quirk.
When Izuku revealed that his quirk wasn't his and actually All Might, Katsuki called him on Saturday just to make sure he was telling the truth.
That day, they went to the park they used to play in all the time. There, Izuku explained the whole story.
If Katsuki tensed when Izuku told him he was on a roof that day, nobody but the two of them needed to know.
They went home that day awkward and tense- different than their usual lightheartedness but the next saturday they were carefree and enjoyed their day off.
Nothing was going to stop them and their Saturday plans. Not even their classmates. So when they got into the dorms, they made no effort to hide it anymore.
Izuku was dressed in something other than his ‘t-shirt’ pajamas while he studied a little with todoroki. Even if Todoroki was explaining everything in ways that did not help Izuku at all, he enjoyed the others' company and the effort he went through to explain everything in English for Izuku.
“Nerd!” Katsuki called out. Everyone tensed as they got ready for another fight to break out between the two, “Where are my keys?”
Izuku took a second to think, “they're in my drawers i think!” he shouted and went back to work.
“Midoriya-kun?” Tsuyu called out, “Why are Bakugo’s keys in your room?”
“Because I needed to get something from his house!” Izuku chirped and went back to his work. “Todoroki do you mind explaining-”
“Why would you need something from his house though?” Mina asked
“Because I left it there last week?” Izuku asked as if it was obvious, “do you mind explaining this, todoroki?”
“Come on nerd,” Katsuki said and walked to the door, “let's get going.”
“One second Kacchan, i just need todorokis help for this one question.”
“It's English, isn't it?” he gruffed out in response
“W-well yes- but!”
“Just get over here. I'm not letting you make me late." Katsuki said, a smirk growing on his face as he put his shoes on. The nerd would owe him one next time.
Izuku sighed but got up nonetheless, “sorry todoroki, maybe next week?”
“Of course Midoriya,” he responded and went to continue his own homework.
Izuku quickly went to the door, pulled on his blindingly bright shoes and followed Katsuki out while the others struggled to hold in laughter.
“What just happened?” Kaminari asked the rest of the class.
“Did we just see Bakugo and midori getting along?” Mina added
“I think,” Uraraka started, “I think we did.”
2.
The second time it happened, it was just as weird for the class as the first.
“Kacchan.” Izuku said rather seriously as he walked into the common room, “I need your help.”
“No.” Katsuki replied and continued to watch his show.
“But-”
“No.”
“Kachan-”
“‘Kachan’ nothing.” Katsuki grumbled.
“It's rather rude not to help another person!” Iida chided
“Mind your own business four eyes.” Katsuki glared
“I'll make mum's curry?” Izuku offered. His last card.
“Whenever I want?” Katsuki smirked.
Izuku nodded, “whenever you want.”
“Pass me the phone.” Katsuki said and got off the couch, “I want your next booked tv time as well.”
They noticed quite early on that while some people enjoyed horror, some enjoyed a more lighthearted show. And after the third day of fighting for the remote, which was much more dangerous when it was twenty hero students, and they were forced created a tv schedule so they could stop arguing
“Got it.” Izuku said with a big smile and gave Katsuki i his phone
Then the class watched as Katsuki opened Izuku's phone and scrolled through Izuku's contact list to call someone.
“Hi uncle,” Katsuki smiled, “Izuku isnt here but he told me you wanted to talk to him at some point.”
Izuku visibly sighed in relief as Katsuki left with his phone to continue the conversation and went to sit down where he was.
“So what are we watching?” Izuku asked only to be met with gaping faces from Katsukis friends.
The incident went unnoticed until Katsuki came back two hours later and threw Izuku's phone back at him.
“Move out the way.” Katsuki demanded and Izuku scooted a little so they sat next to each other.
“That was a little short.” Izuku sighed
“Short? It was two hours-” Kaminari complained
“Did he say anything?”
“You're in so much trouble when you call him back.” Katsuki laughed
“You were supposed to stop that-”
“No, I was meant to distract him. And I did.” Katsuki said
“Did he say anything else?” Izuku complained
“Just that you're not as cool as me and that he wants you to call more often.” Izuku rolled his eyes, “and All Might messaged, he wants to meet us later.”
“About?”
“Same old.” Katsuki replied
“You'd think he'd tell us about what. I'm sick of being at his beck and call.” Izuku complained and Katsuki nodded
“You have All Might's personal number?” Sero asked
“And you're complaining?” Kirishima finished
“The favoritism in this school sucks.” Mina mumbled
The rest of the class nodded in response.
“I want my curry,” Kastuki said and leaned in his seat so Izuku could hear him, “today.”
“Got it.” Izuku mumbled and Katsuki turned around and continued the work.
That day Izuku cooked for the whole class while Katsuki sat next to him as he cooked. If it was only to see what the recipe was, no one needed to know. (he still couldn't get it right by himself)
The next Friday, Izuku and Katsuki were planning something for them to do. It was so much easier when they were kids and their mums would tell them to get dressed and they just had to follow.
“Kachan,” Izuku started and looked at Katsuki, “why can't we just train?”
“Because we need a break from it.” Katsuki grumbled, “Did we already go to the beach this year?”
“No but uncle said he wanted us to do that together.” Izuku mumbled and looked a little sad, “what about the swimming pool?”
“So you can increase your endurance? Nice try.” Katsuki shut down and scrolled down his phone, “what did we do last week?”
“We went to the museum.” Izuku said
“What about going to a different District? I think we've done everything here.”
“What are you two doing?” momo asked as she walked down the stairs.
“We're trying to think of something to do tomorrow.” Izuku answered, “Do you have any ideas?”
Momo took a second to think, “why don't you go to Tokyo tower? Most people actually don't go unless they’re tourists.”
“We did that.” Katsuki grumbled
“What about hosu?” momo starts, “it's very pretty and it has a lot of things-”
“No!” Izuku blurted, “ah- sorry-”
“Don't mumble, damn nerd.”
“Sorry Midoriya, dont worry about it,” momo said and rubbed the back of her head. She forgot about his internship.
“What about the cinema?” Momo asked as more people entered the common room.
“What are we talking about?” Jirou asked
“Midoriya and Bakugo want to go somewhere, they just don't know where.” momo stated
“We already went to the cinema.” Izuku complained, “it was horrible.”
“No one wants to hear your sob story.” Katsuki rolled his eyes, “what about the ice cream place?”
“Last month.” Izuku said, “and All Might put me on a new diet plan.”
“All might give you a diet plan.” Kaminari gaped.
“Damn old man.”
“Why don't you two go to a different district?” Kirishima asked
“Maybe.” Katsuki responded
Suddenly, Izuku sat up and looked at Katsuki, “why don't we go home? Come on, it will be so fun.”
“Out of all the ideas we gave you,” Kaminari said, “you find going home fun?”
“Let him live! It's manly to want to see your parents!” Kirishima said
“We haven't gone in a while.” Katsuki mumbled
“And I miss auntie!” Izuku smiled, “we have to go.”
“Fine, go call auntie and tell her.” Katsuki grumbled and got up, “Are we sleeping over?”
“Of course.” Izuku rolled his eyes and started scrolling to his mum's number.
“Mine or yours?”
“Mine.” Izuku responded
“Should we include dad?”
Izuku thought for a second, “no he's gone to milan.”
Katsuki nodded, “I'll go to aizawa and get the permission slip.”
When the duo left, Jirou was the first to come to her senses.
“Did those two just plan a two day trip?”
“And admit that they've been to other places together?” Kaminari responds
“ And call their parents auntie and uncle?” Jirou continues
“Wait-” Kirishima starts, “how are they going to get a permission slip for tomorrow. You need at least a week.”
Suddenly both boys walked in and seemed to exchange a look together. A secret conversation between the two of them.
Then Izuku handed his phone to Katsuki, who opened it and began calling someone, and Katsuki handed Izuku the permission slip, who double checked the correct details on the sheet and went back to Aizawa's room.
Both boys had a look of determination on their faces.
“Did you guys see that?” Jirou mumbled
“I don't think bakubro got the permission slip.”
“I'm still shocked Bakugo knows Midoriya's password.” Kaminari mumbled
“And that he even lets Baku leave with it.” Mina replied, “I wouldn't be able to live knowing someone had access to my phone.”
The rest of the group nodded as the two came back, big grins on their faces.
“Aizawa said we can go and I have already filled in for next week.” Izuku said
“Cool, where are we going?” Katsuki asked as if he gave Izuku back his phone
“Aizawa recommended it, some mall we haven't gone to yet.” Izuku said
“Nice. he knows the best places,” Katsuki answered, “mum cleared her schedule and auntie said she’ll try to give her case to an associate. I even called All Might and he said you can eat ice cream.”
“Nice!” Izuku cheered, “tomorrow at nine?”
“Yep.” Katsuki nodded
“Do you think it's too late to invite him?” Izuku asked, “maybe next week though?”
“Yeah.” Katsuki replied
“I hate this school.” Mina grumbled.
“I bet they can convince nezu to do things.” Kirishima grumbled
“Oh! Thanks for reminding me of Kirishima-kun!" Izuku said and quickly got his phone out and began texting someone.
“You forgot again?” Katsuki asked and looked over Izuku's messages
“Well-” Izuku blushed, “nezu doesn't mind anyways, it's fine.”
“Whatever lets you sleep at night.”
Izuku blanched, “you don't actually think he gets annoyed? Do you?”
Katsuki just shrugged, “he's a man of many mysteries, i have no idea what he thinks.”
“He won't mind- it's only been,” Izuku began counting on his fingers
“Seven times.” Katsuki filled in, a smirk growing on his face.
“Seven.” Izuku whispered.
“But you know,” Kastuki shrugged, “he probably won't mind.”
“Of course he's best buddies with the principal.” Jirou mumbled
“Who's next? A supervillain?" Kaminari asked.
Suddenly Izuku blanched and looked down.
Kastuki stopped smiling and looked at Izuku.
“Deku-” Katsuki started, “you better not actually be friends with a supervillain.”
“I was just joking Midoriya-” Kaminari started.
“It's not like we're friends, ” Izuku started, “not really- we just talk and play games together.”
“Midoriya-kun, I believe this is something you need to go and report.” momo added
“We’re not really friends though-” Izuku starts
“How often do you talk?”
A silence fills the room.
“Who is it?” Kirishima tried
Another silence fills the room.
Katsuki took a second to look at Izuku and then sighed. “It's dusty isn't it?”
“What- no. I wouldn't be friends with someone who- who tried to attack us. That's. That's preposterous. Why would you even suggest something like that?”
silence filled the room again.
Until uraraka came down the stairs. “Why are you silent?”
“NO REASON!” Izuku shouted and he threw a look to everyone else in the room.
Kaminari was the first to get better, “we just found out that Midoriya and Bakugo hang out with All Might outside of school.”
“Oh. that's so cool.” uraraka said and they all awkwardly laughed as she went and sat down on the couch.
4.
The next time the duo confused someone, it wasn't in the dorms and instead in one of their classes
Hizashi had walked into the class, hoping to get some marking over and done while he gave them a small assignment to do.
They were supposed to write an essay about something they were both passionate about but in english. It wasn't something too hard but most students would find it hard to do within one period and present mic would have the next three lessons free to do his work.
He already knew that certain people would pair up and that it would be fairly loud but what he did not expect was that Bakugo and Midoriya would pair up together and for them to work together calmly.
He couldn't even work for longer than fifteen minutes before checking on them only to find them silently working together while Midoriya corrected some of Bakugos paragraphs. After marking some of Midoriya's tests, it was pretty easy to understand that he was fluent in English and didn't need much help.
And he wasn't fluent in the way Todoroki and Yaoyorozu were, where they can hold basic conversations. Midoriya was able to talk about anything and everything.
It seemed like the universe was laughing at him because before the class even finished, the duo went up to him and handed him an essay on quirk discrimination.
Quirk discrimination.
They didn't even cover social injustice as a theme yet. How would they know what the words meant if Midoriya wasn't fluent?
“Are you two done?” Hizashi asked and looked up at them.
“Yeah,” Bakugo replied gruffly and walked back to his seat which was still facing Midoriyas.
“I'll get to this right now!” Hizashi smiled and saw Midoriya get back to his table and start talking to Bakugo calmly.
Why were they acting friendly?
Even more to his surprise, Hizashi saw Bakugo draw on Midoriya's hand as they were talking.
Hizashi sighed and looked at their essay. He was absolutely right. Midoriya was fluent in English because not only did they talk about things they never mentioned in class, he was referencing research papers that were written in English and used words that even in Japanese would have been hard to understand.
Good god.
He already knew this would actually take a while to mark.
He spared another glance at the duo who were now laughing as Izuku seemed to reenact something.
A smile grew on his face as went back to his own work.
The dorms were oddly silent. It wasn't unusual for them to be quiet sometimes, but it was silent.
It scared Shota.
His hell class has never ever been this quiet and he already knew who was the cause.
He looked around the dorms, trying to find out where the two students were before remembering that today was a saturday.
The day that the two first came into his room asking for a permission slip, he sighed and told them they needed at least three days ahead of time. He would not sign them off a day ahead.
But then they explained their little ritual and- ok Shota knew this was going to sound stupid- Bakugo started crying a little, saying that these Saturdays were the best ways for them to both cope with the horrors they faced and they just needed to do it, no matter what.
Shota knew it was bullshit, he did. However, his kids had all gone through horrible things that no one their age needed to go through. So if he was a little soft on them, who cares.
That weekend they were off with All Might so Shota didn’t necessarily need to worry but he had a feeling. a feeling that took ten years of hero work to gain.
he sighed as he heard the door open behind him and in followed Bakugo, Midoriya and All Might
“You boys go straight to your rooms.” All Might ordered, much to Shota's shock. What was he doing?
“but-“ Midoriya started
“but nothing Izuku. go to your room now.” he held strong. What did he do to get All Might mad? wasn’t he his protégé or something?
“damn old man.” Bakugo whispered then tensed immediately
“three days.” All Might added and the boys both seemed taken aback
“But Toshinori-“ Izuku knew his civilian name? just what was happening? “i cant i have things to do- and”
“and nothing. you two will go to your rooms and think about what you’ve done. I will hear nothing about it.” All Might commanded
they exchanged looks between each other, which no one but All Might seemed to understand
“go before i increase jt.” he threatened “do i make myself clear?”
“yes toshinori.” both boys said in unison then grumbled their way to their rooms. Shota was certain that they were going to go to one of their rooms- probably Bakugo so they don't need to see All Might’s face everywhere- but he won’t snitch on them
he sighed, “what did the two do?”
“They got into a villain fight.” All Might responded
these kids. he told them to go to this district because he knew it had the lowest crime rate
“How did they get into a villain fight?” aizawa asked
“We were shopping and while I was paying, they left to check out a different store and saw a villain.”
“ok. I'll take the necessary discipline.” Shota said and sighed. these boys were going to give him a headache
“thank you Shota,” All might smiled, “i knew i could count on you”
Shota nodded and saw the hero off before going to Bakugo room. He was right. midpriya was laying on Bakugo bed kicking his feet and Bakugo was on his chair fervently nodding
they were whispering to each other about All Might
“All Might told me what happened,” Shota paused and the two tensed “who won?”
the boys smiled “we did.”
“obviously.” Bakugo added
“Ok, tell me exactly what happened” Shota said and walked into the boys rooms as they passionately re-enacted their afternoon.
Their respective acting skills were both horrible and amazing, truly an experience that Shota could and would never forget. It would be imprinted in his mind forever, he couldn't easily forget that face of his students making a scarily accurate All Might face.
at some points they would add what they thought of All Might when he acted in a certain way and Shota couldn’t help but agree
they took the logical steps
and they beat him
they did nothing wrong in Shota’s eyes so if he didn’t follow the punishment All Might gave them. no one needed to know
+1
The next weekend, the common room was filled with the students sitting on the couches and floor, trying to understand why they were there.
The reason?
todoroki shoto
“I know you guys might be wondering what we’re doing here.” Todoroki started and everyone nodded. “we’re here because i’ve cracked the code on the Bakugo and Midoriya mystery”
he started and pulled out a board out of nowhere “momo can you create me a pointer finger?”
“Of course! what colors do you want?” she asked
shoto thought for a second “orange and green.”
she nodded and pulled out an orange and green finger pointer
“Thank you,” he said and flipped the board. It looked like a maniac did it. He had photos of the two and a red string connecting them together and. Was that their student records?
“So here,” shoto said and pointed at a photo of them fighting on the first day, “we see them fighting and they establish that they don't like each other. Of course to the naked eye, it seems like just that but to the expert eye.” shoto paused for a second for dramatic effect, “we can tell they were arguing about something because right after that Midoriya wanted to say something to Bakugo.”
“So what?” Mina asked
“Ok. so here,” shoto said and points of a whole empty paper with just the words “kachan” and “deku” on it. “We see that they're familiar with each other. They call each other nicknames that seem familiar enough. Close enough that Midoriya made it his hero name.”
“That was weird.” Kirishima nodded, “but where are you getting at Todobro?”
“I'm getting there,” shoto said, “and here, we can see their student records and look at who Bakugo has listed as his emergency contact. Inko Midoriya. AND Midoriya has Mitsuki Bakugo saved.”
“It's highly inappropriate to have their student records stolen!” Iida chided
“Now. this part may seem highly unbelievable, however.” shoto started and just then, the two boys walked in laughing between each other.
Then immediately stopped and looked at each other, “whats going on here?”
“Nobody but Todoroki knows.” uraraka explained
“It's something about you two though.” tsu said
“Perfect, you two are finally here.” shoto said and smiled, “now after months of trying, i have secured dna samples from both of them.”
“Todoroki!” Momo shouted, “you can't just do that!”
“Let's see what the nerd is getting at.” Bakugo said and walked towards Todoroki board, “this is really detailed.”
“He even has red strings.” Izuku murmured, “and our student files.”
“Nezu.” They both replied at the same time.
“Where were you going anyway todoroki?” Izuku asked him
“After testing your dna, there was a 27% match.” shoto said and the two looked at each other in shock. “Meaning, you two are related!”
“Wait what.” they said and looked and prodded at each other, looking for any signs of similarities.
“There's more.” Todoroki smiled, “I got a piece of All Might’s dna- dont ask how- and he had a 50 match with you two.”
“What does that mean?” Kaminari asked in a grave tone
“It means they are both half brothers and All Might be their dad.” shoto said with a small smile.
The two looked at each other and then realization struck Izuku.
“Kachan-” Izuku started, “I know what's up.”
“Well then enlighten me you damn nerd. How the hell am I related to you and All Might?”
“Your mum could have cheated-” Todoroki brought up.
“DON'T TALK ABOUT MY MOTHER LIKE THAT YOU DAMN STOP STAR CANDY CANE!” Katuski bellowed
“It's.” Izuku started, “it's actually really cool.”
“How?” katuski demanded
“I can't tell you out in the open.” Izuku replied and gave him a pointed look
“Oh. So when you? And when I? And then?” Katsuki asked and was met with fervent nodding, and started laughing “that damn old man.”
“You shouldn't talk about your father like that!” Iida chided
“HE'S NOT MY FATHER!” Katsuki shouted
“It's not what the test showed.” Kirishima joked
“No wonder you guys are favored by all the teachers.” Jirou pieced together