Looking for a Fic

[shes-a-geek.livejournal.com]

Sometime recently, I remember reading a new(ish) ACD-based fic where Watson learns from Holmes that one of his patients, who he had assumed to be a fairly harmless, inoffensive man (and with whom Watsom may have had a fling, I don't remember) offered to turn in his lovers and the members of their shared club to the police in order to protect himself. Does anyone else remember this or have any idea what it might be? Thanks!

Edit: It's Holmes who had the fling with Watson's patient, but the fic is tweedisgood's Every Possible Combination of Events: http://tweedisgood.livejournal.com/129290.html