I'll Give You My Life (OLD)
10 parts Complete Sasuke is dying, but he is the last listed on the transplant list. Without a working kidney, he's going to die.
Naruto has just got his cancer cured and is healthy again. He hears from his nurse, Shizune, about Sasuke and has decided that he is going to help the teen.
There's one thing wrong with helping him, Naruto only has one functioning kidney. If he goes through with the surgery, he'll die. If he doesn't, Sasuke will.
(SasuNaru shonen ai fanfic)