Okay, In this story, Kagome is a grim reaper and has agreed to help Sesshomaru after discovering that they have a mutual enemy. Tensaiga allows Sesshomaru the ability to summon Kagome as the Grim reaper. Over time, they fall in love and he tries to find a way to restore her to life so they can be together. Also Rin and Kohaku are together in this story and Rin is fairly old at this point.

Okay, this story is only been completed for a few months, but I can't for the life of me remember the author or the name, and it was really famous and awesome, and gah, I should know the name, but it escapes me. Serious tip of the tongue moment. Can someone please help me!!

The only story that comes to my mind is "Death's New Mistress" by Quiet Whisper, but it's incomplete. I hope it's what you're looking for.

Here's the link :

www.dokuga.com/fanfiction/story/3143/1

Rated MA

Oh, I thought it was complete, must have gotten it confused with In Death, Trust me as you didn't in life, That story is complete and they come out around the same time so I must have thought they had both been completed, silly me thanks so much!! Karma for you!!

You're very welcome! It's one of my personal favorites as well