Looking for a specific fic

[eirendel]

Pretty sure this is wincest. What I remember is Sam has been taken by a group of bad guys - witches, I think - and Dean finds him with Ruby's help. Dean inturrupts the ritual and ends up bonding Sam to him. Sam is pretty out of it at the start from what the bad guys had done to him, seeing strange colored lights.

Any ideas?

FOUND: link in comments