"I smiled at him as I played with my clit and pussy lips, getting him even more turned on... Then I said:"
"Well, you see sometimes I might ask you to let me play with your penis, since my research involves male sexuality, and I don't have a penis of my own... Would you let me do that?'"
"He got even more excited at this, since he loved it when I took control, and this seemed like I would be really using him. He found it very hard to speak thinking about this, so he just nodded very eagerly."