Hmmm, I read below that The Prize is what prompted your request in the first place, and that was what had immediately sprung to mind. I'll try to search my mind (and my memories ;) ) for others that might fit the bill. Do you want any Jim as a captive fics? Or specifically as a slave only?
I think the best one is The Prize (http://foresmutters.org//FSPtextfiles/prize.txt). I also like Beside the Wells (http://www.ksarchive.com/viewstory.php?sid=448&warning=1). The first has some non-con because Jim belongs to someone else before Spock, but it is easily skippable if you have trouble with that.
Okay, I think this fits your request. Again, I haven't read it in a long time, so I hope I'm remembering it correctly. The Pleasure Slaves (http://www.ksarchive.com/viewstory.php?sid=571) by Fiona James.
no subject
Date: 2010-03-24 04:15 pm (UTC)no subject
Date: 2010-03-24 05:51 pm (UTC)no subject
Date: 2010-03-24 06:32 pm (UTC)no subject
Date: 2010-03-24 07:19 pm (UTC)no subject
Date: 2010-03-24 04:16 pm (UTC)no subject
Date: 2010-03-24 06:17 pm (UTC)no subject
Date: 2010-03-24 07:04 pm (UTC)no subject
Date: 2010-03-24 09:18 pm (UTC)no subject
Date: 2010-03-24 07:47 pm (UTC)http://cjs-own.dreamwidth.org/9565.html
no subject
Date: 2010-03-25 12:27 pm (UTC)no subject
Date: 2010-03-25 07:17 pm (UTC)The Sun Will Rise by Vampire_mdc
its the one your looking for i think