She'd heard they'd rearranged the wording a little, made it DAaD instead of DADA. She couldn't be held responsible for giggling a little to herself in time to come when she realizes that made him the professor of DAD.

The only answer he gets to his question is the return of her bright grin as she steps into the classroom, though she only makes it about halfway in when she spins slowly, taking it all in.

One of her eyebrows is raised when she catches his eyes again, before she goes to find what might have been her usual seat, and sets herself down on the desktop itself. Finally she looks at him again, like she's reassessing something. Comes to a decision.

"This suits you."