Fic Serach: Slavery AU with freedom fighter John given to Sherlock to break? (BBC verse) FOUND!

[kaligrrrl.livejournal.com]

Hi! I'm looking for an AU series--a WIP when I last read it--in which John was a freedom fighter in a society that kept slaves, with collars as a prominent symbol. Mycroft gives John to Sherlock to break through a new special collar that has physiological effects on the person wearing it, including sexual ones. It was long and plotty with a burgeoning D/s romance. Details I can remember: John was in the US at the begining, where his cell was captured and possibly a non-con encounter between John and Mycroft?

Ring any bells? I'm desperate to read it! Thanks!

edit: found, thanks!!!!