He stops for a moment. Neither option is open to you at this stage. You are my plaything and you shall be used as I see fit. No one is coming to save you.  He leaves what he was doing to her and stands. She can see his erect cock. He lays a hard slap on her pussy and the sound of the blow echos around the room. He shovels two of his fingers into her and starts to finger fuck her. With his other hand he places the tip of the knife on her thigh and starts to trace it upwards. He pushes hard enough to leave a scratch as the tip cuts her skin just a little. He traces the path up her leg over the triangle above her pussy, over her belly and up to her breasts. He makes a swirl pattern on the soft flesh of her breast. He brings the edge of the blade to her nipple and while he doesn't do anything to the nipple she can feel the keen edge on her tender skin.