Katsuki gets really emotional whenever he thinks of holding hands with Izuku, because he regrets deeply not taking his hand that day when they were kids.
They're not dating yet, but Katsuki is in love with him and, as usual, doesn't know what to do with all the feelings he has for Izuku.
So
Katsuki *hurts his finger*: F*ck!
Izuku: Let me kiss it better, Kacchan!
Katsuki: Wtf, are we five again or what?
Izuku: It's okay if you don't want to–
Katsuki: Tch! Fine!
(A couple of hours later)
Katsuki: SHITTY HAIR, I NEED YOU TO PUNCH ME IN THE MOUTH!
Kirishima: What?
