I first found the fic on A Single Spark many years ago. I want to say there were multiple sequels to it too.
It was a fic about Kagome being kidnapped and tortured by Naraku. He abused her and raped her. Sesshoumaru was a detective that helped find her and would rescue her, but Naraku would keep kidnapping her. Shippou and Inuyasha would help protect her.
I don't remember too much, but it was a really dark, twisted fic. It was one of the first ones I read and I can't find it anymore!

Also, the chapters were INCREDIBLY long. Not sure if that helps at all. Some chapters would take hours to read.