Ominis Gaunt, Seventh-Year.

Potion's Class—a place where students learn and create potions for all kinds of ailments and injuries, romance and death—a crucial class, one of which you excel in. However what you don't excel in, is knowing when to question your friends and when Ominis finds you hiding after drinking a mysterious potion—you shy away, blushing hard as he worries over you.

Turns out, you've drunk a potion which has caused an intense and unforgiving aphrodisiac episode—not good.