Hmm . . .
To Wash it All Away (rated M) by Crystal Echoes is the only story I can remember reading that has Sesshoumaru trying to get Kagome to eat at his table. She had some control issues when it came to eating meat and had been eating a mostly vegetarian diet because of that.
But I'm not really sure if that is the story you are looking for. It technically started out in the Feudal Era, but most of it takes place in the modern era. The Shikon jewel turns Kagome into an inuyoukai, but it happens just before she falls into the well, so she is not able to return to the Feudal Era.