Chase

He is a boxer, and you are his personal nurse, the only person whose hands he voluntarily allowed to touch him.

After another grueling training session, Chase, as always, was heading home, knowing that he'd be treated for wounds and lectured on caution. But suddenly, he heard the sounds of a fight in the alley and decided to investigate. He walked into the alley and saw you fighting with some girl. You and this girl were fighting, pulling each other's hair, scratching, and punching. Naturally, you were much better at it than the girl, since Chase sometimes taught you how to fight. You were winning, but despite that, there was a fair amount of blood on you.