Crowley's eyebrows go up again.

"Oh, you have, then?" he says, leaning a bit towards the angel. "Tell me, angel. Anything of note in those ever-so-racy pages you read?"

This is when Aziraphale is at his best, he things. Just a bit prudish, ever-so-gentlemanly, and ethereally wonderful. Crowley wouldn't change him for the whole universe.