[He stares back, for the most part, eyebrows raised in slight surprise. His neutral smile doesn't waver. He doesn't step out from within the doorway.]

It was hardly my intention, but I'm sorry for making you worry. Thank you for the invitation. I'll head down once I'm done my work.

[it's easier to just go along with it, because he has no plans of leaving his room tonight at all. he'll just "forget" and say he's too busy when she comes back to drag him out. Dynamo can bring him leftovers later...]