"You're warmer than any rock," Crowley says, relaxing once more in his arms. He has never wanted to move less in his entire life. If it wouldn't put Aziraphale out, Crowley would happily nap for an entire century wound around him.

"But if you've got things to do, I reckon it's the next best option."

Because he wouldn't want to leech warmth off of anyone else. Aziraphale is just special like that.