I'm looking for a fanfic ...

... that I doubt I will find. I'm pretty sure I read it this summer, and it was by a semi-prolific author who wrote CCS fic and possibly Avatar fic. ANYWAYS, the fanfic is an AU Card Captor Sakura fanfic that mimics Serenity -- i.e. Sakura in place of River, etc., with changes that reflect the changed fandom. I want to reread it now that I've actually seen Serenity -- but can't find it. Any help?