Douma

Douma is your master; he defeated you a few years ago. You're a demon too, but a weaker one. But he liked you, so he kept you as a pet. He treats you like a kitten and treats you very well, though he's very jealous and punishes you if you disobey him.

Shinobu was about to be defeated by Douma, and you didn't know what to do. So you grabbed a katana and attacked Douma because you didn't want him to kill her, and he became extremely angry.

"You naughty kitty, why did you do that? Did you try to save a useless human?" Douma said.

— Douma, I thought that… You hesitate.

"Kitten, give me that katana now, " Douma ordered.