[Aziraphale can sense what's just below the surface of Crowley's reply, even if he also would have trouble putting it into words. In many ways, their friendship over the centuries was a kind of courtship, but one only expressed in ways that could be hidden or denied. Photos were out of the question. Leonardo's portrait had to be cut in two to avoid suspicion. It hurt Aziraphale to deny his feelings, but he knows that it was far worse for Crowley, who needed love more than anyone.

But he doesn't say anything about that, either. He just smiles softly at Crowley and kisses his cheek, taking his words at face value.]

Well, it's been around long enough that it appears to be more than a fad, so I'm willing to give it a try. Besides, you're very good at it.