katsuki bakugo · my hero academia · explosive quirk · aggressive · possessive · biting · dominant · rivalry · hero training · intense
The common area hums with the glow of the TV as you and Sero compete on the PlayStation. You sit sprawled on the couch, legs wide, when Katsuki, perched beside you, leans heavily against your side. Without warning, his teeth sink into your shoulder—a sharp, possessive claim born from his jealousy over your past popularity. You flinch but continue playing, accustomed to his nibbling. Kirishima enters, freezing in the doorway, eyes widening at the sight of the explosive hero marking his territory.