In my opinion, VirtualPersonal (LJ (http://virtualpersonal.livejournal.com/253875.html), AO3 (http://archiveofourown.org/users/virtualpersonal/pseuds/virtualpersonal/works?fandom_id=27)) has done some great crossovers in fandoms I'm not even particularly a fan of. Most of them feature both BAMF! Sam and hurt!Sam.

* The Winning Scenario (http://archiveofourown.org/works/3296645): (Old-school Battlestar Gallactica) 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.

* Dragon Spell (http://archiveofourown.org/works/3181757): (Dragon Riders of Pern) Snooping around in his father's storage locker, Sam touches something he shouldn't and gets sucked into a world where dragonriders must protect their world from a continuous threat of threadfall. Dean follows and finds Sam has lost his memories. Until they get out of this mess, they have to ‘make like the natives.’

* Entangled Fangs (http://virtualpersonal.livejournal.com/223067.html): (Twilight) Sam Winchester, a werewolf who takes his duties very seriously has a big problem. The human he imprinted on a long time ago has returned to town and is the vampire, Dean Cullen. Can he keep the hard headed, newly made vampire safe from his brothers - his werewolf pack?

* Craving (http://archiveofourown.org/works/3702277): (Twilight) Sam Winchester is sent to the rainy, cold, small town of Forks and is prepared to be bored to death until he meets and is fascinated by Dean Cullen. The hunter in Sam knows something is “off” with the Cullen boy but he can’t make himself care. Dean is equally enthralled by Sam but is leery because there is a good chance he will end Sam’s life. There are a thousand reasons why the hunter and the vampire should never get together, but who is listening?

* Possession (http://virtualpersonal.livejournal.com/175603.html): (Twilight) For years, Sam Cullen has been held and tortured, death denied to him because he's a vampire. When Dean Winchester saves him and Sam gets a whiff of Dean's intoxicating scent, a new sort of torture ensues. This is ridiculously

Edited 2015-05-11 05:55 am (UTC)

oooo thanks! I've read (and LOVED) the first two but hadn't seen the other three. Thank you so much!!

Warning, Possession is like, more than 3/4 UST and dirty talk and angst and boys freaking out... but it's still awesome.

I believe that kind of warning is more properly called an "enticement." ;)