A year or two ago I read a story on FFnet...the most I remember is that it had 'dream' somewhere's in the name.
It was a three part story...
The first part tells of Sesshoumaru and Kagome dreaming of each other yet not realizing it until Sesshoumaru takes Kagome to his castle. They mate and Kagome is changed into a youkai, Inuyasha is put under a spell by Kikyo and hurts Kagome, who in turns steals his sword to take it back to Sesshoumaru.

I can't remember much of the third part.

But the third part involved Kagome and Sesshoumaru fighting against Naraku and Kikyo again after they had been killed, Kouga possessed by Naraku..he tries to rape Kagome's daughter because they look alike. Shippou mates I believe the Bear youkai lady of the east...maybe south.

I know the story you are talking about.The name is on the tip of my tongue and it is going to make me batty. I will look too.

I'm not sure if this is it, but here:

dokuga.com/spark/story/4489/1