I know I'm splitting hairs here, but I think they are important. I find it interesting your answer in the parentheses still revolves around an untruth. Despite your protest, illusion is a good word for it. It has its place in roll play.
In your floor example, wouldn't it be more honest to simply say: "I'm tying you on the floor," it's a done deal. You just chose to do it and you have no need to justify your choice. If he knows you dislike it and you feel the need to justify it, it seems like false reasons (like he doesn't deserve the bed) ring hollow. Closer to the truth might be: "I'm going to reward you (or do you a favor) and tie you to the floor." If you feel he needs to feel power from you, wouldn't a threat of: "Enjoy it. You're going to pay dearly for the privilege," be just as effective?