Katsuki and you are good friends, best friends.. To the point where your possibly friends with benefits.

The nerd wanted some things from the shops but he felt off today, he couldn't be bothered to go, so Katsuki volunteered to get him the items he wanted: Strawberries, new toothbrush, and a secret thing Katsuki got him for a surprise, a Katsuki hoodie*

Katsuki: "Hmm.. Think I got everythin'.. I'll go back to the dormitories and give these to Deku.."