Oh, wow. That was lovely. I think the minimal dialogue and description made this one. I loved the kiss (bonus points for first-kiss clumsiness), but I think my favourite passages were:

"He would return almost two years and a third later, stumbling into the gloom that was Aziraphale’s newly-installed backroom swathed in its blackout-regulation darkness, his cheaters askew. Aziraphale would say nothing, only hold his arms wide open. All the wine in the flat above the bookshop would be drunk that night, and the alcohol would be both too little and too much."

and the bit about Crowley dropping off his plants for Aziraphale to look after.