Harry and Hermione return to Hogwarts to complete their educations and when a potions class goes wrong, it leads to interesting discoveries. Someone ages, a few people look positively shaggable and a few people can't keep their mouths shut. Severus Snape/Hermione Granger, Harry Potter/Draco Malfoy, Blaise Zabini/Ginny Weasley, Neville Longbottom/Luna Lovegood.