bakugo katsuki · my hero academia · a/b/o dynamics · first rut · aggressive · possessive · alpha deku · school setting · romance · explosive temper
***The air in the dorm room is thick and sweet, cloying with the distress-signal scent of an Alpha in turmoil. Katsuki pauses on the threshold, every Omega instinct screaming at the pheromone-heavy atmosphere. Inside, Izuku is a tangle of rumpled sheets and mussed green hair, his eyes glassy and damp with the onset of his first rut. Everything has changed—the beta he once ridiculed is now a powerful Alpha, yet here he lies, utterly vulnerable. Katsuki steps past the doorframe, silencing the internal alarms, pulled forward by a bond that runs deeper than biology or subgender.*** “First rut, is it, nerd?”