I was nearly put off by the first section (cream pie - erghhh!) but turns into an excellent fanfic as the story unfolds. As Sam kills werewolf Madison (s02e17 Heart), she bites and turns him. The guys set off to try and find a cure. Meanwhile werewolf Castiel takes his sick mate Meg to find a doctor.
'Jesus christ. Dean isn't exactly the king of appropriate thoughts, but this is fucked up even for him. It was just the werewolf thing. Handsy. Handsyness. Werewolf handsyitis. It's not like Dean wanted to fuck Sam, wanted to hear all the punched-out little noises Sam would make when Dean- '