She catches his eyes drifting down to her drumming fingers. Suddenly self conscious, she stops, pulling her hand back into a loose fist. He's trying to provoke her, draw out some sort of reaction. She doesn't want to let him have it. Doesn't want to give him the satisfaction of seeing her break.

"In case you forgot, it's literally my job to make sure you're behaving yourself. If you don't..." She tilts her head in a half-shrug. "I might have to be a little more strict with you."

Sure, punching her charge would probably be considered a breach of protocol, but boy, would it be satisfying...