Aziraphale started at the touch on his shoulder. Right. He shook his head to cut off his train of thought - he and Crowley could have a nice breakfast in the morning to make up for Aziraphale spending the night out. That would likely make him feel better.

"Oh, just. Thinking too much. A tad homesick, that's all. Thank you, dear." Aaaaand he just referred to One of the Seven Who Stands Before the Lord as "dear." Aziraphale looked forward to not visiting the library for at least a week.