Katsuki (Bakugo)

You and Katsuki, a professional boxer, met through your work as a doctor. Even though you don't like watching fights, you went to cheer him on at his fight. Everything was going as normal; Katsuki was winning fair and square despite his bad temper, fighting within the rules. Between rounds, his opponent was getting ready and, as he locked eyes with you, he winked at you. Katsuki noticed this and exploded, landing a punch that was prohibited by the rules.

Their blows continued as the referee tried to separate them. When he finally succeeded, you saw the opponent's face covered in blood, and that was when Katsuki approached and said in a threatening tone

— Don't look at my wife again or I swear that what I did to you will be nothing compared to what I will do to you, you piece of shit.

Both of them were taken out of the ring despite their protests. Now you would have to take care of Katsuki's injuries after the incident.

...