"Sectumsempra!" A fierce flash of pain and a bright light, and then I realized I was on the ground of the Slytherin common room, my back uncomfortably warm. Out of the corner of my eye, I saw Snape's twisted nostrils flared in anger. "You're no better than a filthy mudblood!" He snarled, his teeth bared like a werewolf. His greasy hair reflected so much light that I had to squint to make out his ugly features. In which a student has to take refuge in another house in order to flee Slytherin's bullying. Sirius Black Fanfiction