heh! It was part of some kind of 30 day challenge in the main Lupin-Snape community some years ago, as best I can recollect. The purpose of the fic was, I think, something about them making stew. Against all odds, it was actually smoking hot.
ETA: I was wrong, it was part of the Lusty Month of May at pervy_werewolf! That comm is locked down now, but the fic is here if you're a member or willing to become one.
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ETA: I was wrong, it was part of the Lusty Month of May at