The question gets Aziraphale to pause, nearly snapping him out of his mood as he's forced to consider what sort of impression that Crowley might have from his end. Was that what it looked like? Did he think that was the issue?

"What?" he asks, ears immediately perking up and alert as if that might help him hear anything said better. Then, he shakes his head. "No, no, no. Of course not! Don't be daft."

That was never the problem at all. Not even slightly.

"I wanted a proper kiss as well!" he blurts out, answering a little too quickly and gracelessly.

He could have worded that better, surely.