"Oh, I'm going to enjoy this." Harry smiled all teeth and no humour. For the first time, the Slytherin realised that he might have taken this a step too far. Seeking help with his Head of House, Blaise shivered when he noticed Snape's stoic expression. Maybe there was indeed more to Harry Potter and Severus Snape's relationship than even he had thought. He took half a step back, but Harry had already started chanting.