This one is fanfic, and a crossover at that:
Two Serpents Meet in a Bar (1207 words) by MToddWebster
Fandom: Star Trek: Deep Space Nine, Good Omens (TV)
Rating: General Audiences
Warnings: No Archive Warnings Apply
Relationships: Julian Bashir/Elim Garak, Aziraphale/Crowley (Good Omens), Ineffable Husbands – Relationship
Additional Tags: Crossover, Walk Into A Bar, Alternate Universe – Angels & Demons, Wine, Innuendo
Crowley and Garak meet in Quark’s bar. That’s it, that’s the story.