The Passenger by roxymissrose. Explicit, Sam/Dean, 68k words. Summary: This is a post-plague curtain fic. Dean Winchester, an MoL errand boy and a bit of a rogue, meets Sam, a hot-tempered and mouthy skinwalker—and illegal slave. Of course, Dean can't let that stand, so cue the rescue, over the mountains and away. They find themselves trapped in a cabin over the long, long season of climate-changed winter. One handsome hunter, one angry 'walker. However will they survive?
https://archiveofourown.org/works/25123861
Just devoured this fic inside of one night. AMAZING. It ticked so many of my boxes, specifically slave!Sam with that fascinating engaging personality dichotomy between vicious and vulnerable, then Sam and animal transformation - I was so thrilled to find out what his skinwalker beast turned out to be. This was a brilliant fic, and also excellent world-building. Also added to my animal transformations reclist and my multifandom monster fuckers reclist.

Freak Camp: A Monster by Any Other Name series by Brosedshield, LaviniaLavender, whereupon (AO3). Rated NC-17, Dean/Sam (unrelated AU), 655k. Summary: Our story takes several steps away from canon. Dean Winchester is an only child. Mary died November 2nd, 1983, but neither in a fire nor on the ceiling. Five-year-old Sam is deported to a concentration camp for monsters. But the core remains the same. This is a love story.
ao3.org/series/5884
Listed in my top favorite SPN fics ever. This slavery fic breaks you (Part 2) and then builds you back up piece by piece (Part Three). It 's a 655k epic that 's been going for about 10 years by the authors. It earns every word. It 's an incredible story of abuse, recovery, rehabilitation, independence and eventually love/romance. I 've reread Part Three several times. Chapter 25 is one of my favorite Christmas stories . An end of an era with this fic matches Supernatural 's own announcement that season 15 will be its last I 'm not crying you 're crying. This fic is included in my rape recovery reclist

The Winning Scenario by brimstonegold and virtualpersonal (AO3). Rated R, Dean/Sam (unrelated AU), 216k words. Summary: Disguised as a merchant during an information gathering mission on a gaming and pleasure station, Captain Dean hits the jackpot. Surprised to learn his winnings include a night with a pleasure slave, he is ready to reject the slave's services until he learns that the slave is human. There is no way he will leave one of his kind behind, no way. The pleasure slave, Sam, has his own secrets. Cylon torture and conditioning to make him a suitable commodity for the slave trade has left him with half memories, nightmares and psychological problems. If he knew Dean was a colonial warrior, there is no way he would leave with Dean and no way he would go anywhere near Dean's destination, the Battlestar Galactica.
ao3.org/works/3296645
my thoughts: So this is a crossover with Battlestar Galactica but honestly you don 't need to know anything about that show to roll with the scifi in this story. It 's a fantastic opening premise and a great read! This fic can be found in my Winchesters... IN SPACE! and movie fusions reclists.

Prime series by Meus_Venator (AO3). Rated NC-17, Dean/Sam (unrelated AU), 91k. Summary: In a cruel and capricious society where slavery is the norm, first born children or Primes become masters, all younger siblings become slaves or Secs at the age of sixteen. Second born son, Sam Winchester, has evaded his fate and helped others do the same while attending college and living as a Ghost, but his luck has just run out.
ao3.org/series/14309
my thoughts: Prime is chock full of explicit torture for both Sam & Dean and less comfort than I crave but there are so many compelling moments in this fic that 're seared into my brain because they were written so well. There 's just enough comfort and hope to pull me through: in the car, buying Sam new clothes, taking Sam to the hospital, and later a traumatized!Dean scene in a limo that I might 've shed tears over.

It was on Sale by HazelDomain (AO3). Rated NC-17, Dean/Sam, Dean/Sam/Cas, Sam/Cas (unrelated AU), 131k words. Summary: Dean's been hunting solo ever since his dad died, and he knows damn well he's running on borrowed time. The simple solution was to buy a slave, someone who could watch his back and help with the heavy lifting. The man he finds is young, healthy, obedient, and inexplicably cheap. And that's just the beginning. Dean figured he'd deal with the catch when he found it, but he's a little busy with screaming ghosts, crazy doctors, lying housewives, geeky witches, sociopathic plutocrats, mind melds, celebratory pie, surprise blowjobs, and oh yeah, a surly angel.
ao3.org/works/6037312
This story was intense and compelling. In particular I remember the sense of equality and trust built up and developed between Sam and Dean over time and during cases was super satisfying. Also the just ending rocked my world! This fic is included in my rape recovery reclist too

Moon-kissed by fogsrollingin (AO3). Rated R, unrelated Sam/Dean, 27k words. Summary: Leviathans led a successful global assault on humanity twenty years ago. The resistance is made up of surviving humans and Luna-borne creatures such as weres. Dean, a Marrow Pack werewolf, runs missions to take down leviathan strongholds and rescue those imprisoned and enslaved there. On this particular mission, Dean is shocked to discover one of the young slaves is a werecat, a species so rare that most weres thought them extinct.
ao3.org/works/19159384
my thoughts on me: I wrote this! I 'm really proud of it. I edited it a bit so there 's a genfic version of it too: ao3.org/works/20381716. This fic is included in my animal transformations reclist 👍