This sounds similar to
From Servant to Master
By Smortz
When Sesshomaru is dropped into a parallel universe ruled by women, and one miko in particular, he has one goal. He must get back and prevent the same thing from happening in his world. Unfortunately, the only way to achieve such freedom is to play along as Kagome's personal pet.
Rated: MA (No YIMS!)
However, Kagome doesn't end up his slave, but rather, he tries to save her from herself by going back to his "reality", saving her and making her his mate. Story is not yet complete. Great story; one of my favs. Hope it's the one! Cheers!