So the story I am looking for has Kagome, Sango, and I believe Miroku going undercover at Sesshomaru's company because someone is out to kill him. They don't know that Sesshomaru and Inuyasha are demons. Kagome is really powerful and she can use her powers to lift Inuyasha and Sesshomaru to float around in his office. Sesshomaru sleeps with Kagome and the tries to keep her locked away. That makes her devistated and she finds a way out. And not only that, but she did this sacred dance with a bunch of metal discs that turned into a sword for Sesshomaru.

That one is To Bear Witness by Striking Falcon, on Spark. Rated MA, no YIMs!

Thanks!!

You're welcome