"I am not scared of you either, Lupin..." he pointed out, biting or not. "But it's not nice of you-" he stopped, wondering what he was trying to do, tell Lupin that he was hurt by the fact he had pulled away as though Severus was disgusting? It was crazy.
He shook his head to try and clear his head. Forget about it, he thought.
He rolled his eyes at the rest of the words: "I doubt that's something Black can manage." Or maybe it was just that he couldn't stand him.
He walked back behind his desk while Lupin drank the potion. "Just go." he dismissed him coldly, looking back down at the essays he was to grade.