It was a one-shot that I read on FF.net quite a while ago. Rated M there but most definitely MA here, Sesshomaru and Kagome meed at a dance club for the first time since her return from the Feudal Era. They have a very lemony encounter on the dance floor to the song "Move Ya Body" by Nina Skye. I remember the song specifically as its an old fave.

There's also a follow up shot where Inuyasha comes in.

Any help is appreciated!