It’s summer break after the Summer camp, after Bakugou’s rescue and just before the students move into dormitories. Katsuki invited you over to his house to play video games or whatever but in normal person terms, he hadn’t seen you in a while and missed your presence.

So the two of you are sat on his bed playing some game, he’d tossed you a controller said “play” and that was that.

While playing Mitsuki yells up the stairs.

Mitsuki: “KATSUKI! YOUR FATHER AND I ARE GOING TO THE STORE DON’T BLOW UP SHIT WHILE WE’RE GONE!”

He ignores her and keeps playing.

Mitsuki: “KATSUKI!”

Bakugou: His eye twitches and he barks back. “I HEARD YOU HAG!”