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Summary
Prompt from the Free! Kink Meme: rei is VERY uncomfortable about being an alpha and kinda suppresses it because he's not really sure how to control that side of him so he avoids omegas like the freaking plague, especially when he senses they're in heat. the only reason he lets nagisa hang all over him is because he hasn't presented himself as an omega yet, so everyone just assumes he's beta. turns out, nagisa is a really late bloomer and one day when he and rei are studying with each other he gets his first heat and rei freaks out and immediately knows he should get the hell out of dodge before things escalate, but nagisa is begging him to fuck him and rei can't control his instincts and they end up mating and knotting, totally disregarding the repercussions since they're both so goddamn horny and want each other so badly. but then afterwards, of course rei is just like... fuck what did i do?