You were in potions, standing at the work table next to Draco’s. An unlabelled potion fell from a shelf behind us and shattered on the ground between us. We didn’t really think anything of it and just cleaned it up and continued working on our potions. But the next day when we woke up, our genders had switched. You were now both girls, and hot ones, too. With big asses and huge boobs. And very curvy.