I remembered an old fic I had read but never saved and I want it back!  It has Sam and Dean on a case in Louisiana and after finding a bunch of bodies turned to stone, they figure out that they're after a Gorgon (like Medusa) and it was a big deal because it was ancient magic and shit.  I remember that a guy was flirting with Dean and Sam was all pouty sitting in the front of one of those fan boats and Sam and Dean defeated the monster by blindfolding Sam and having Dean try to kill it with a mirror so it would turn to stone.  I'm pretty certain it was wincest, but I could be wrong.  Does this ring a bell or three? 


ETA:  Was found very quickly; it's  The Dark Mirror by  ellipsisblack