“What? You just got here, we just got rid of everyone,” Michael says, his hand going to Lee's arm as though she's about to bolt and a point of contact will somehow stop her.
He does, in fact, have Important Work Things to do, but they can wait. His day is a lot more flexible now that he is the opposite of excited about going home. ‘Stay late, goof off in the meantime’ sounds like a winning plan. (And by ‘goof off,’ he means ‘maybe kiss Lee a little bit,’ because she looks extra pretty today and he can't get over the lunch thing. Peggy closed the door on them herself which basically means she gave him permission.)