I have two that might work for you....
There all general...

Heart's Desire - involves a witch placing a spell on Dean that causes him to over protect Sam... it gets so bad he holds Sam basically against his will- drugging him.

http://www.fanfiction.net/s/3999778/1/Hearts_Desire
Sequel... once again Sam is held against his will
http://www.fanfiction.net/s/5273822/1/Kiras_Revenge

Sounds of Silence- Dean kidnaps Sam to help him...
http://www.fanfiction.net/s/3890703/1/The_Sounds_of_Silence

Thank you, goes to read!

You're welcome- happy reading! :)

Awesome, thanks!

An awesome (and hot) read!

"That Stockholm Thing"
http://dijisun.livejournal.com/3181.html
J2 AU. Jared kidnaps Jensen. Definately on the darker side of things, but not too bad.

One of my favourites, ut I am definately going to read it again!

Rule 26 (http://fleshflutter.livejournal.com/tag/rule%2026) (WIP) by fleshflutter
A mash-up of Star Wars, Flash Gordon and a few other sci-fi stalwarts.
In which there is a galaxy-spanning evil empire, a mission to kidnap a henchman of the aforementioned evil empire, and Jared is a resistance fighter on the aforementioned kidnapping mission.

Sounds very interesting, thanks very much :)

This one rocks!
x

http://breea1.livejournal.com/9203.html

It's more accidental kidnapping. Jared finds a drugged Jensen in his car, and later in his bedroom. It's really awesome and funny and still serious - and might not be what you were looking for, but there is quite some kidnapping going on ;-)

It's very dark, have so much warnings. But I loved it a lot. It's friend only, but you may ask, I think :)
Title: Lost & Kept: A Confession
http://blynnk.livejournal.com/51633.html
Author: Blynnk Characters: Jensen/Jared/Misha/Christian
Rating: NC-17
Word Count: 3700
Summary: The unsupervised, privileged existence and boredom of three brothers leads them to do the unthinkable.
Warnings: kidnapping, slavery, non-con, bdsm, implied incest, dark themes, kept!Jensen

And you always have Winchester Identity
http://community.livejournal.com/zuben_fic/?skip=40&tag=winchester%20identity

I definitely second "The Winchester Identity"! That one is amazing!

I also wanted to point you in the direction of one of the upcoming BigBang stories (and after searching through the the summaries and posting schedules posts I can even give you the title, summary and post date lol):

Disaster. (This is a Good One.) by aisalynn
Jared, a college drop-out, unlucky in love and a self-professed "loser" finds himself at the end of his rope. His long-time boyfriend, Misha, has ditched him at the last moment, right before the family Christmas dinner Jared'd planned to bring him to, and thanks to an untimely phone call from his mother, Jared's family thinks Misha is still coming. A series of uncomfortable moments later--including awkward phone calls to his exes, a terrible trip to the mall with is best friend where they were escorted out by security, and a run in with a schizophrenic who thought Jared was trying to take him into a government lab--and Jared has Jensen--an angry, former lawyer who's dedicated his life to charity work--handcuffed in his car, blackmailed and forced into pretending to be Jared's boyfriend. As the holiday stretches on and the charade he's involved in becomes less and less a lie, Jared is only sure of one thing: he should stop listening to Chad.

posting date is July 14th...

haha, omg, this sounds seriously awesome, can't wait.