[Recovering... he closes his eye as she dabs at it, soaking up the blood. Thankfully, it's not a constant drip -- which might just make it seem even more as though they were meant to be tears.]

...Miss Kirigakure. I know you're only trying to help... but the sooner I accept that this body is dying, the sooner I can accept what might come next.

This isn't the first time I've gone through this, you know. It's not exactly well-known... but all demon kings eventually perish in this way.

[Which is pretty Extra compared to other demons, who would simply die of old age if they weren't immortal, or aren't exorcised or killed first.]