Help, please.  It's a fairly recent story.  Dean and Sam have split up, Dean is hunting alone, while Sam is back in school.  He's dating a guy, a very political and active member of the gay college community.  Dean comes to visit, seriously injured, and hates the guy on sight.  He even starts to clean his machete right in front of the guy to scare him off.  Eventually, Wincest occurs.

Does this sound familiar to anyone?  If so, please let me know.  Thanks! 

ETA- FIc and link in comments.  Thank you, Nebula!