Fear The Sunless Lands
http://www.youtube.com/watch?v=uebInqG1pJIAn enjoyable hot fanfic in which Dean has been turned into a vampire and Sam protects him from the Hunter Guild while searching for a cure. However Dean still needs to feed and is deeply attracted to Sam.
'He gets the sense that Sam might be talking to him or something; he's sort of stopped paying attention to anything that isn't the flirt of Sam's vein against his tongue and how, if he sucks at it a little, he can taste the richness of his brother through skin.'
