"You-know-what, I know." Severus shook his head in disbelief. He had tried hard to ensure that neither knew who the wolf was to not place anyone in danger. Now they knew; he had to know. Was it a good or bad thing? "Merlin, the two of you are as subtle as a brick to the face. Of course, I knew. I brew the wolfsbane for him. Every teacher at the school knows."