This guy is a real pain in the ass, Katsuki can tell already. The guy practically slides over the bricks and snorts at his irritation, and he looks smug as hell about the whole situation.

Glancing up at the other young man, well, if looks could kill, Katsuki would've ended him in that moment.

"I never really went trick or treating." he says, dismissive, "It wasn't really a thing where I come from. So no, my parents didn't teach me crap about Halloween candy."

Shaking his head, he pauses for a moment as he feels the laughter bubbling up again, and chokes it down, gags on it, and looks like for a moment like he's going to puke from it.