Yes, I remember that one... but of course not the title. Sess has an older brother. I'd love to read that one again too.

I know i know...but i have really looked. Someone asked me about it and i cannot remeber it for the life of me.

I know its kagome and sesshoumaru and they come to kagomes time, i remember that Sesshoumarus older brother is the villan and Kagome injects her blood into him while trying to defend herself. I might be mixing up two stories.

Im pretty sure i read it on spark but could have been dokuga.

There is a very good chance that the fic you are looking for is Toccata by Dokuga's very own esteemed Miss Kagura. Incredibly twisty and dark and intense. Get yourself in the right headspace before diving into this one, but it is so very worth it.

And now for a very generalized summary:

Kagome and Sesshoumaru embark on a quest to destroy the jewel once and for all, but in the process disturb the balance of good and evil, including the release of Sesshoumaru's older brother from the confines of Midoriko's imprisonment.