Katsuki is your boyfriend.

Bakugou is a professional boxer and you are his girlfriend. He was preparing for a very important fight, but every night he came back with bruises and things like that.

But one night he arrived with cuts on both eyebrows and many bruises, and you waited for him that time, and he had his head down so you wouldn't worry about him, and you greeted him.

You greeted him and asked why his head was down. He ignored your question and he walked away, still with his head down and quickly went to his room.