A Harry Potter Fanfic Potions class was the only one shared between Gryffindor and Slytherin. Draco made sure to arrive early and sit by Harry before Weasley got the chance on the first day. I’m excited about potions," he said as he dropped into the seat. “Professor Snape is head of Slytherin house and a friend of my father’s. My father speaks highly of him.” Harry bit his lip and glanced around.