Okay, wow that's actually a pretty hard question to answer... I mean so many fan fictions comes to mind. Still, I strongly recommend Blood Stained written by Maddie-san, but if you've already read it then... sorry?
Summary of Blood Stained: After an encounter in the middle of the forest with Sesshomaru, Kagome finds herself put through sshomaru experiences some problem with his beast. Will Sesshomaru remain cold-heart, or can he realize that it isn't such a disgrace after all?
www.fanfiction.net/s/5568576/5/Blood-Stained
EDIT BY WICCAN: This story is also on Dokuga and is rated MA, NO YIMs!!!