Nobody's promised tomorrow. It just takes one second, and life as you know it can change forever. Kokushibo knows this, and he knows it well. He's not concerned about death for himself, but for you. You're just human, who grows old over the years.

And it's only when he noticed a single grey hair as he combed his claws through your hair that reality finally hit him. You can't live forever. You'll grow old eventually, and he doesn't have the heart to turn you into a demon. He can't taint something so beautiful to him like you were.