Remedial Buffy by glossolalia (Buffy/Cordelia, Rating: X, Set mid-s6/s3) [non-lj link]
     Authorial Summary: Buffy's mopey, Cordy's not, and even if they're slumming, fun is had.
Solid voices, characterization, continuity, and timeline-grounding. Plus girl-fucking Cordelia.

And that mutual grooming thing that chimps do? Also good. If you see typos, broken links, or anything else that needs fixing on this site, please let me know. And always feel free to recommend me fanfic, books, whatever.