Crowley may protest. And Aziraphale will expect him to. And they will continue that cycle until it changes into something else, as things tend to do. It's just the natural flow.

"Oh, of course. Wouldn't want to come up short." Even without either of them looking, the angel still pulls a mock serious frown, which lasts for a whole two seconds before he's smiling again. "How does it go, again?"