I think its a oneshot, i know its complete.
Basically i remember that Sess wakes up from his heat,
and has a warm body next to him and it turns out to be Kagome.
He's shocked b/c she's turned into a youkai, and its
never happened before that he knows about.
Then Yusha shows up and is all "WHERE'S KAGOME!?!"
sess is like, as you can see its just me and my Mate."
and then Yusha gets all loud, and 'Mate' sit's him.

as i said its an old one, but a good one.
i just wanted to read it again ^_^

0o0o0o if anyone could recommend fics where kagome's
a demon from birth, not hidden AU/CN,
I'd like to read one of those right about now :3