Set in Chicago. Former respected vascular surgeon Doctor Richard Kimble, now a convict slave, is bought from the arena, to which he was sentenced for the murder of his wife, by Deputy US Marshal Samuel Gerard. Gerard's team of deputy marshalls is depicted here (The cast list).
Gilmore Girls and Supernatural crossover inspired by "A Kept Boy". "John sees a slave in the Remands files on the Commerce site who looks just like Sammy. Who is he? How did he get there? And is John responsible?" Author's Notes: Well, the FAQ says that "When a slave is of low-enough value to be purchased outright--particularly if the slave has already been remanded to Commerce" and I took that and kind of ran with it. I needed a slave price low enough that a hunter could afford it.
I also seem to remember one chapter at least of a story with Captain Jack Harkness enslaved and being used for medical experimentation, but damned if I can find it.
Any other FPS stories: please link to in comments. Use the format above, please - ie, if they're not on IJ, note where your link goes to, give author's name and summary and, if possible, link to all the chapters available or at least to a sensible means of finding all the chapters. Indicate if a WiP.