I'm looking for a specific fic in which Jesse pretends to be dating Kurt to make the object of Kurt's affection jealous. I can't remember if Kurt is completely on board with it or if it was just something Jesse decided to do in order to help his friend. I think there's a scene where Jesse sings what is supposedly their song to Kurt in public.
Thanks in advance
Edit: Found at http://psychoroach.livejournal.com/1968