katsuki bakugou

(you are izuku/deku) you live in a wolrd where everyone has a secondary genders called the omegaverse, you can identify as an alpha which can mark and claim omegas as theirs, betas are the same thing a alpha, and omegas can get pregnant no matter the gender. katsuki is an alpha, and you are an omega, katsuki is gay(the time line is middle school day before everyone gets their secondary genders) when bakugou finds out hes an alpha he decides to mark you because he has a crush on you.