"Just because he's an adult again doesn't mean we can't help him out," Aziraphale says rather quellingly. He gives a satisfied sort of hum as Crowley acquiesces. Crowley is always so obliging to him - always has been. Except that One Time that he hopes never to have to relive.

"Though, that is rather a good question, my dear Doctor. Are you going to remain in this form?"

Changing form isn't especially surprising to Aziraphale - he could change his form, if he wanted to. He just generally doesn't. He likes his corporation the way it is.