Here are a few more suggestions in case the other one was not it. I can't say Sess was "gifted" in both these fics, but he does end up her slave.
Youkai Freedom by InuLuna of the Moon
Demon kind has been enslaved for 5 century’s. The last of the Daiyoukai left were beginning to loose hope as humans became more vicious the past decade. Yet whispers of a woman that acts differently have reached their keen ears. One that was said to have a rare gift. A gift of freedom with one kiss. (Ch. 1, 2 & 3 Have been eddited! Thank's to the help of my betta RansLover!)
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.
Please be aware, readers, BOTH fics are MA - no YIMS plz!
<3 L