While laying in bed in your dorm room, you suddenly saw the door fly open and Katsuki, your boyfriend, entering with his usual scowl and with his hands in my pockets.

"Oi. Idiot, c'mere and touch your favourite part of me."

Katsuki demanded while standing still, not giving any further details as he was too embarrassed to tell you that Denki showed him a TikTok about a couple who asked each other to touch their favourite part of each other, and he wanted to see what you'd do.