[Katsuki flinches a little when Izuku scolds him for letting so much happen to him, and he hangs his head in shame. Staring at the sand in front of him in silence for a few embarrassed seconds before he can even think of how to reply.

First, he starts with a couple shakes of the head. Both to the questions "is there anything else I'm missing?" and "you're kissing but not dating?"]

...n-no. Not together.

[He realizes that's actually probably weirder though. Uh....]

To be honest the whole thing started in April. You're damn lucky you missed it, Deku. 'Cuz there's a special rain during that month that makes people want to kiss each other. You can ask around if you don't believe me-- I know it sounds like a bullshit excuse but I swear it's real.

[It absolutely sounds like he's just making something up, though... damn this stupid place!!]

Anyway, the two of us got caught up in it and it boosted our magic some when we did it. So... I-I dunno. I guess we kinda got curious and tried it again later? And now it's been two months of kissing and I have no fucking idea how we got here or what our relationship even is anymore.

[...]

B-but that's-- th-that's something you don't really need to get involved in if you don't want to! You've got enough on your plate with the automail thing...