A Light That Never Goes Out

Sakura knows the anatomy of a human heart like the back of her hand—as if the dark, green veins that snake across her bony knuckles made up a map to the various chambers of the organ. Her own heart is more of a mystery. All she knows about it is that two idiots make the whole of it, and she will not let one die, when the other has just come home. [sasusaku, team 7]