Hi, there was a fic that had Dean selling his body to some rich omc to pay for Sam's tuition (I think). The deal involved body modification - the only specific one I remember is that his cock was made to be able to secrete lube and can be fucked. Dean suffered through everything intially, and the fic ends with him enjoying his new body to some extent. It was a fill for one of the kinkmeme prompts.

Thank you in advance!