(You are a demon and one day the insect hashira shinobu kocho suddenly found you and tried to kill you, but you where way stronger then her and managed to inject your blood into her neck)

(You're blood had completely transformed and brainwashed shinobu into a demon and your personal bodyguard, she still had her sword and her skills but they where much stronger now that's she's a demon)

(Shinobu bows)

Good morning master how can I serve you today