Okay, so I posted this to Sherlock Search, but have had no luck. Trying my hand here:
I have tried all variations of google searches and I have looked through many, many tags in various communities but this fic is eluding me. Basically, Moriarty calls John and coerces him to have sex with/rape various people that John does not know over the course of a month or longer. If John does not, the consequences are the death of the person he refuses to assault - I believe the first person is a man who is reported to have "committed suicide" after John refuses. As far as I remember, the noncon is not explicit and the fic deals primarily with John's behavior as someone who has been sexually assaulted(I think Mycroft had to bring this to Sherlock's attention but I may be mistaken).
Other things of note: I remember that Moriarty would call either weekly or regular enough that it almost seemed like John was in cahoots with him, but, again, I think Mycroft (but maybe Sherlock) realizes that the behavior is more in line with abuse. I also seem to remember a discussion in the comments about the complex nature of John being a victim in the fic as he is typically the aggressor in what Moriarty makes him do (EG he has John assault other people at the risk of the other person's life).
This may have been a comment fic or on the kink meme. Please help because I am losing my mind trying to find it.
Found! Fragments by softandwoollenhttp://softandwoollen.livejournal.com/1123.html?thread=3683