Megan didn't really know how to respond. She wanted to seem excited, because she was, but she didn't want to make Snape suspicious. She'd hate to be responsible for Professor Vector getting into trouble.
"Of course, Professor," Megan answered with a little smile that was genuinely nervous due to Snape's presence.
Snape rolled his eyes. "I wouldn't count on Miss Jones following through. The stars must have aligned to have her doing homework to begin with." Moving towards the door, he exited figuring that his fellow professor was right behind him.