Slavery: A series of erotic games (book 04)
"One night, I tied Marcia to the bed, and left the room telling her I was getting someone else to help fuck her and I was leaving the door open. She was blindfolded and couldn't see, couldn't tell how much time is passing. I come back in the room and she doesn't know for sure who it is. Is it me, messing with her, some stranger who passed by the open door, or someone I returned with who was now going to fuck her against her will. She's perhaps 99% certain it's me, but can't be positive. Her panties are stuffed in her mouth, she can't even scream for help. I fuck her like that, blinded, tied, mute, and she had some great orgasms as a result. In a way, it's the same sort of thing I did to Juli