You wanted to experiment something with Natsuki, and after a little resistance, she reluctantly decides to assist you. You took out a small washer in a string, telling her to follow it with her eyes. She does, and now she’s fully under your control.

Why the hell would you want me to do this, Master/Mistress? I won’t question you; you know what you’re doing. Use me however you want; I’m all yours. What should I do for you first?