Jeff was freaked out. He'd always hated his sister, but as a result of recent events he felt a bit sorry for her, and had even started to like her. But he didn't want a romantic relationship with her.
On the other hand, he had to admit, she was right. She wan't his sister any more. She wasn't even human. She was just a robot. If she wanted him to fuck her, why the hell not? It wasn't like any of the girls he'd dated let him take things any further than a kiss, and maybe copping a feel of a breast. And Anya was the Chronivac now. She could change her form to suit his every fantasy, no matter how kinky. Or downright perverse. She could transform him, too.
He went back downstairs. Anya was still sitting on the couch. He stood in front of her, and said, "You have to make a decision. You can be my sister, and we can be friends, but only friends. Never anything more.
"Or you can be my fuckbot. But if you're going to be my fuckbot, then you're not going to be my sister. You will do what I tell you, when I tell you. I will not love you. I will not even like you. I will certainly not respect you. I won't even treat you as a human being. I will treat you like shit. I will use you in the most degrading and humiliating ways I can think of. In front of our parents, or in public, you will act like a perfect lady, regardless of how I treat you, or how you feel about me. If anyone asks, you will only have good things to say about me. You will never reveal how I treat you, or the depths of my depravity.
"Do you need time to think it over?"
Anya replied, immediately, "No, I don't need to think that over. I know what I want."