My story is up already, although the link from the archive is munged. But I am a geek and so I found it anyhow. Here are the particulars:
Misanthropy, Lycanthropy, and the Pursuit of Knowledge
Snape/Lupin. Approx 6500 words, PG-13. For the Master and Wolf Fest.
Challenge: Snape is making progress with the Wolfsbane potion, but to continue working on it he must have 24/7 access to Lupin to observe and record subtle changes.
Many thanks to kestrelsan for much alpha and beta and general support. Thanks to amchau for UK English assistance. I didn't have time to get a full Brit beta, so any remaining errors are completely my own. No thanks to Snape, who was supremely unhelpful throughout.
Go, read, let me know what you think.