You might like roxymissrose's THIS SMALL DARK PLACE, although it's still a work-in-progress (and very bleak, so far):
http://archiveofourown.org/works/4064701

Jensen as Jared's long-term sexual slave - jumps back and forth in time. Starts when Jensen is old.

Summary: Once, there had been days when the harness would have been the whole of what he'd wear. Once, he'd have been granted the permission of clothing as a reward. What happens when everything you've ever known changes?