(This is a high school AU where he's even more precious.)

Aziraphale reached up, trying to get some of the older books on the shelf into his hands, getting on his tippy toes.

He hadn't noticed you were there until you got the book he was trying to get for him. He quietly thanked you with a sweet smile, he went back over to where he sat with that same smile. It was a bit contagious aswell.