The smile is more genuine when Mike says that. It means more than he probably realizes that he would go through the trouble, but then again, Mike was a writer, a sucker for a narrative, enjoying double meanings and riddles and smart approaches to small things like that. It makes Will relax a little bit more.

He laughs a little bit, dredging up what he'd learned from his boss about flower arranging for the job. "Sincerity, friendship, energy, desire? I think you did good. And...yeah I like the colors too." He knows that Mike is probably really frustrated by how freaked out he gets by physical contact if they're not careful, so even the slight indication that Mike might still want him is encouraging. Unless it was on accident, in which case they could totally twist the meaning as they saw fit.

"So...see you Saturday?"