Draco vaguely thought back to some of the mornings right after he had mastered the Patronus. There had been several mornings where they had both conjured their patronuses and he had teased Granger endlessly about her tiny otter when his dragon would chase it around the room. It had never occurred to him that it could change forms. He had heard about this, in theory of course. Granger had told him about his cousin and the werewolf, but that had been a special case. The man was a werewolf after all.