I saw your first posting, but the fic wasn't familiar to me. Then when I saw your post here, I thought I'd help search because I know the frustration of not being able to find a fic. I googled some of your description and came across this one that I think may be it?
Title: Fragments Author: softandwoollen Rating: R Word Count: 8100 Pairing: None Warnings: noncon references and flashbacks Summary: For a prompt on the kink meme. When John is caught up in another one of Moriarty's sick games, Mycroft is the one who notices first.
(apologies for the lack of formatting for the link)
no subject
Title: Fragments
Author: softandwoollen
Rating: R
Word Count: 8100
Pairing: None
Warnings: noncon references and flashbacks
Summary: For a prompt on the kink meme. When John is caught up in another one of Moriarty's sick games, Mycroft is the one who notices first.
(apologies for the lack of formatting for the link)
http://softandwoollen.livejournal.com/1123.html?thread=3683