"Snape, Roger, Nott...," Sirius starting rambling off and if there was an unusual pause before Snape's name then it was because Sirius knew Lily would throw a book at his head for calling him something else!

Sirius flipped open the book and hummed. "Would you believe me if I said I already completed it?" Except for the History of Magic essay that he was pushing off until the very last second. Writing it put him to sleep as easily as Binn's lectures did!