Katsuki: *trying not to lose against a villain*
Izuku: *in the crowd* KACCHAN! IF YOU WIN, I’LL SIT ON YOUR FACE!
Katsuki: ….
Moments later….
Katsuki: *standing by the defeated villain looking at Izuku who’s now red* My reward, nerd.
Izuku: I WAS JOKING!!! *blushing*