I am having a terrible week and some of my bookmarks were deleted. Found most of them again, but there are a few stories that my Google- and delicious-fu have failed me at.

1. A Benders AU where Dean was kidnapped and raised by the Benders. It was on ff.net and the writing style skipped back and forth from past to present. There were several chapters. No Wincest (at least as far as I read), but mentions of Dean being raped by his "brothers." I think the Benders called Dean "Gabriel." 
FOUND: This one is no halo, an' one wing in the fire by silver_ruffian

2. JA/JDM AU RPS, where Jensen is Jeff's kept boy. I thought it was by poisontaster , but that's a slave story. In this one, Jensen is a spoiled, live-in lover whom the security staff have nicknamed "Princess." Jared is his bodyguard and (platonic) friend. There are several stories in this verse. Jensen goes to college to study art in the later ones. 
FOUND: This one is the Kept 'verse.

3. Kinda filthy but very hot JA/JDM RPS, with Jensen as a bit of a slut who goes home with Jeff one night, sucks him off in his hallway, then preps himself and lets Jeff screw him, still in the front hall (I think). I also think there was at least one sequel where Jeff mentally chides himself for sleeping with a co-worker, then has his brain short out when he sees/fucks Jensen up against the Impala.
Found! These are "One Night" and "Rules Are Made To Be Broken" by sangembrasse, but the fics are f-locked.

Crossing my fingers for these. Thanks to castalie, sin_of_pride, and sayacat80 who found them all.