Based on that^ video with changes.
"Kacchan" the greenette calls to the blonde who's focused on his phone.
"Mm" he grunts in acknowledgement
"Pay attention to me" Deku whines
"I am, I just answered you"
"Get off your phone"
"No I'm doing something"
"Like what?!"
"Arguing with Mina"
"And why is that"
"She wants me to wear the girls uniform"
"Oh makes sense but still I wanna cuddle"
"You can cuddle me"
"But I want you to pay attention to me" the emerald-eyed boy whines as he throws himself at his blonde boyfriend.
"Do that again and you'll be sleeping alone" the blonde huffs turning off his phone.
The greenette wraps his arms around Katsuki."Kacchan don't be like that" he muttered kissing Katsuki's neck.
"Whatever"
The next day in school
"YOU WORE IT" Mina squeals
"Duh" Katsuki commented walking in the class with such confidence.
"YOU LOOK SO GOOD" Mina squeals jumping up and down.
The emerald-eyed greenette glares at a certain boy who's looking a little to much.
"Katsuki sit the fuck down" Midoriya growls
"HAH What is your problem?!"
The boy glares at the confused blonde. He gets up out of his seat, walks towards the blonde and he stands in front of him."Deku what are you doing" he questions.
"Eyes up here Todoroki-kun" he growls
"Deku chill out. He's just looking like the rest of them" Bakugou adds
"Shut the fuck up" he says quietly dragging the blonde out of the classroom.
Deku slings the blonde over his shoulder."Deku put me down"
"No"
He takes the blonde to his room and slams the door, throwing the blonde on the bed.
"Don't ever do that again"
"Why are you so mad, he was just looking it's not like he can touch"
"You're still mine"
"Shut up you big baby"
"I'm serious Kacchan" He says grabbing onto the blonde.
"Aww does the baby want milkie" Katsuki teases
"Kacchan"
"What you're the one being a big baby, throwing a fit then clinging onto me"
Hopefully that wasn't bad and you enjoyed it.