Title: Make Thick My Blood
Pairing: Sam/Dean
Rating: M (for violence, not for smut)
Wordcount: 20669
Artist: stormbrite
Beta: agelade
Warnings: discussion of past noncon, possession, vomiting, seizures, self-harm
AO3 link

Summary: S10 AU (after 10x14). Cas has an idea for curing the Mark of Cain; but if they go through with it, Sam will have to pay a terrible ( Read more... )