I'm looking for a specific fic in which Sam is under a spell/curse that makes him think he's a cat. He begins the fic ordering a v. rare hamburger, soon after he stops speaking, and then he proceeds to nap constantly, rub his face against dean, etc.

Dean eventually figures out that Sam thinks he's a cat and has to head over to Bobby's to remove the curse. I know that at one point cat!Sam is pretty horny and pretty much dry humps Dean against his will.

Hope someone can find this!