This Whipping Boy Done Wrong

Slight AU for episode 10.3, "Soul Survivor," with some minor spoilers. Written for the prompt: "For whatever reason, Sam has to cut or shave off all his hair. For reasons nobody around him really understands, it's extremely hard for him. Cue dean/cas/whoever trying to understand/comfort him." Title, of course, comes from Metallica's "The Unforgiven." Gen.