[fic] arm (horror, r)

[steeplechasers]

Title: arm
Author: steeplechasers
Genre: Horror
Pairing/Characters: Sam/Dean (background); Sam, Dean, mentions of Cas and Cole
Rating: M
Word Count: 4200
Warnings: Gore; mentions of self-harm.
Summary: Something is happening to Dean's arm.
Notes: Canon divergence between 10.03 and 10.04.

LJ / AO3