Pyromania (http://tigriswolf.livejournal.com/81388.html) and
Pyromaniac (http://tigriswolf.livejournal.com/223718.html) by tigriswolf
The first time Dean controlled fire he was thirty-three, way too old to develop a power. And fire? Not cool. Not cool at all.

Things that Go Bump in the Night (http://sn-crossovers.livejournal.com/788692.html) by wizefics
Summary: Thirty-five minutes. That's all Dean needed for this job. As long as everything went according to plan, of course. Dean/Remy Lebeau

Proving Otherwise (http://archiveofourown.org/works/42651) by scy
Not everyone is what they seem, and some of that is hard to explain.

Big Damn Heroes (http://eldee-fic.livejournal.com/33365.html) by eldee_fic

Wolverines, Wendigos and Winchesters (http://www.fanfiction.net/s/5155714/1/Wolverines_Wendigos_and_bWinchesters_b) by SciFiNutTX
SN pre-series / post X-Men Origins: Wolverine - Dean meets Wolverine during a solo hunt, which leads to friendship and a new job.

http://hunters-retreat.livejournal.com/244811.html?style=mine SPN/X-men/Leverage, Dean/Elliot/Logan

http://slashfest.livejournal.com/155017.html#cutid1 Dean/Gambit

http://eldee-fic.livejournal.com/33365.html Dean,Gambit

Honestly never read this because I'm not into X-Men but I am aware of it being there. Hope it helps. http://samdean.archive.nu/series.php?seriesid=227