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Sam always starts in a different spot. He’s done this a dozen times before, but it’s been a while because he doesn’t want the same thing coming around too often. Dean might get used to it. The thirteenth spot is just behind Dean’s left knee.
Dean’s suspended vertically about a foot off the floor, spread eagled and held in place only by Sam’s power- today chains would get in the way. Sam mouths Dean’s neck, resists the urge to bite that would mar the skin. He wants this one to be flawless when he hangs it on his office wall.