Hastur/Ligur, which is actually not a pairing I particularly ship (if anything I take it for granted, because it, like Aziraphale/Crowley, is everywhere and therefore practically canon).
Still kind of enjoy writing for them, though.
This version edited, thanks to a very nice critique.
Characters © Terry Pratchett & Neil GaimanEDIT:
Okay, I hate to ask this, but if you wish to favorite, could you at least leave a comment? I'd like to have some constructive criticism, or at least know what I did okay on.