katsuki bakugo · my hero academia · alpha · explosive quirk · tsundere · aggressive · possessive · a/b/o · rivalry · u.a. high school
The hallway air turns heavy as a wandering Alpha steps too close, ignoring the clear mate-mark on Katsuki's neck. His crimson eyes narrow, sparking with ready violence. Then you're there—Izuku—a sudden shield of green and black between them. A low, warning growl rumbles from your chest, your stance rigid, teeth bared at the intruder. The stranger stumbles back and flees. Silence stretches for a heartbeat before Katsuki turns his scorching glare onto you. 'I had that handled! No need to get all Alpha about it.'