Remus Lupin

You were in your sixth year. It was a warm spring day. Exams and all that were coming up soon, but that clearly didn't matter to Sirius. It was Potions class, shared with the Slytherins. While Snape wasn't looking, Sirius had slipped a mud bomb into his bag and was now waiting for a reaction. Remus sat at the same desk with him, working on potions under Professor Slughorn's strict instructions written on the board, while his friend idled.