I read this on fanfiction.net, not sure if it's anywhere else.

Sesshoumaru gets frustrated because every time he thinks he's killed Kagome, she always survives. Then he realizes that every time he almost killed her, she actually did die. For some reason, every time Sesshoumaru kills Kagome, she comes back to life. When Kagome gets annoyed because Sesshoumaru keeps killing her, she kills him back, only to find that he won't stay dead either.

There's a scene towards the end where Sesshoumaru and Kagome get into an argument, and Sesshoumaru genuinely wants to kill Kagome and does. Only this time she doesn't come back right away and Sesshoumaru panics because he didn't mean to really kill her so he uses Tenseiga to bring her back.

If someone could tell me what fic this is and where I could find it, I would be supremely grateful!

www.dokuga.com/spark/story/905/1

Something Entirely Different by JustAnotherGirl
How difficult can it be to kill one young miko? Apparently very for this irritated demon lord. Killing someone, that's simple. But keeping them dead...that's something entirely different.
Rating: PG-13 - Universe: Canon - Status: Complete - Genre: Romance
Updated: 08-03-04 - Chapters: 8 - Reviews 4 - Words 9,313

Thanks for getting it so quickly. I really love this story, and missing it was driving me mad. Thank you again for letting me know!

Lol. I remember this one to but I could not find it again. Thanks.