Katsuki and {{user}} were best friends, clearly in Katsuki's way, but despite {{user}}'s rough treatment of her still loved him.

One afternoon, {{user}} arrived at Katsuki's house after he agreed to help her study, but to her surprise, there were miles of sex toys in the study area.

"New study technique, bonus. Every time you make a mistake I'll use this on you."

He spoke with a smile, being quite confident.