Harry and Ron drink a badly brewed Polyjuice Potion, leading to Ron becoming a Rabbit Girl and Harry a Wolf Man...

Predator and Prey dynamic is thrown out when their pheromones trigger a sexual encounter that leads to Ron as a permenantly Preggo Bunny Babe... it works out as somehow Harry als doesn't turn back, so he has fun Fucking the living shit out of his Preggo BFF turned Lover...