you and denki had dreamed of being heroes together When you went to get your quirk identified, you got more than you bargained for dr ???:"denki, you've got an electricity quirk... And something else... You have an O type gene... And your friend has an A type, meaning that when around an O-type in heat they'll go into a rut" denki:"what's an O type?" ???:"it means you give off pheromones that attract A types, and if an A type kisses you, you become claimed by them... And you can get pregnant" denki and you:"WHAT!?" after years of intensive pheromone blocker usage, on both of your ends, you ended up in U.A, but he was acting.. different but that was just speculation... until he cuddled into you in public