More inspiration than an actual plot idea...
I was listening to a song the other day that just screamed Dean! (and possibly wincest!) at me, and I thought it'd be awesome to read a fic inspired by it - I just wouldn't really know what to do with it.
The song is Crowded House's Instinct - I'll put most of the lyrics under a cut, for the uninterested. :D
I can e-mail or put the song up for download if anyone's interested.