I made a load of recommendations on similar lines in a reddit thread a few weeks back here (& there are lots of other great recs in that thread too) . The recs in the reddit thread were all written pre-2024, here are some written after that:
Paired by @sunrisesinthesuburbs and @firelikestars: Post s1 - Crowley & Aziraphale go for dinner in Italy. Beautifully written.
Strange Things Done by @sk3tchid: Aziraphale and Crowley go on a journey across the frozen Yokun Territory not long after the holy water argument
All Of The Above by @copperplatebeech: Heaven has asked Aziraphale to complete a questionnaire to re-certify as an angel, and Crowley helps - both of them drink extraordinary amounts of alcohol
Not Quite Like in the Romance Novels by @whocaresaboutdecent: Aziraphale knows he loves Crowley but isn't sure if he wants to kiss him
and all i do is kiss you, through the bars of a rhyme (iâd do the stars with you anytime) by @chlorine-and-daisies: Crowley stream of consciousness. Love the characterisation, manages to be both angsty and funny
Confiteor by @adverbian: Aziraphale feels guilty and Crowley helps him. The kind of conversation I wish they'd been able to have in s3
till forever falls by @carry-the-sky: one of my favourite post s2 fics - Aziraphale and Crowley stand together just before the apocalypse is about to start.
Lamb by peonyscones: another great post s2 fic, Heaven captures Crowley and offers him as a sacrifice to start the second coming.
Falling through the hours by @incendiaryof: very angsty post s2 fic, Aziraphale is written out of the book of life (no happy ending here)
Between Stations by @pickle-a-in: Aziraphale & Crowley meet in a train station. Aziraphale is a passenger assistant and he is attempting (!) to help Crowley to his train
my sun, my moon, and all my stars by badwolfgirlicouldkissyou: Aziraphale and Crowley meet on a rainy day in the bookshop, and Aziraphale commissions Crowley to paint a mural
Burn Your Fire For No Witness by wyrmy: Set in the 1920s. Crowley is an artist, Aziraphale is an aristocrat who has PTSD after WW1.