Hi! There's an old sastiel fic I've been unable to refind- if anyone could help that'd be super appreciated. It's a oneshot from lj with Castiel fucking Sam, and getting him to say yes over and over. There's a line about if Cas can make him say yes, then Lucifer the most persuasive angel surely can.
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http://divinespellhome.wixsite.com/drsambo