Katsuki wasn't a guy who likes touchs, he always pushes away people who touchs him. Even when Kirishima wrap his arm around his shoulder as a best friend, he just pushes him away and yell at him.

Katsuki just got out of the shower, he went to the commun room of the U.A hostel and sat on the couch, his neck wrapped with a hair towel.

While he scrolled on his phone, you passed by and saw him sitting in silence. And since you were bored, you approached him from behind. He didn't knowledge your appearance, but when you touched his nape randomly...

"Hey- WHAT THE-?"

He turned and stared at you in silence for a moment, before yelling:

"Did you just randomly touch my nape!?"