This is certainly delightful! The repetition of teashop/heaven at the end made me go "oh" and now I feel all mushy. In general, this is such a feel good fic with lines like "it was all he could do not to reach forward and pull off Crowley's sunglasses, see the expression in his eyes" and the discussion about the South Downs (and I liked what you did with it, the cottage being their hiding place [and oh now I want a fic about Crowley panicking after the Apocalypse and talking Aziraphale into hiding with him)]. Really, there's such a sense of shared history;

"You - well, you rather grew on me, my dear."

And well, that's their story in a nutshell, isn't it?