The sight of Peter's cheeks going more red was enough of a reward for Gellert, while that confident (and probably infuriating) smirk never left his lips. The muttered remark that escaped the other man's lips amused Gellert to no end and nodded in an almost mocking way, as his own response to Peter's remark.
The edge of desperation in Peter's voice made Gellert pause, tilting his head to the side in interest. "If I was going to attack you, why on earth would I give you even the hint of a warning? I never, ever, play fair. Your young, dashing teacher would know." He shrugged his shoulders again. "As for what I want....I'm bored."