Before I could even attempt to get up and escape, Tia jumped on me and pinned me to the bed with her body, while Tara went round the bed and handcuffe... my ankles and then my wrists to the makeshift bedposts at each corner. It was now clear to me that when they said they wanted to experiment with me, they meant it in a sexual way. It would be completely non-consensual as I wouldnt have even considered it, especially with my sisters, but clearly neither of these factors seemed to bother them at. Maybe that command meant roll over? I did that and lay prone on my back with my bare tits in the air and pussy on display for him.“That’s it sex slave”. He rubbed his barefoot across my chest sending an immediate shutter through me. “Oh! So you like it when Master strokes you with his foot. Nice!”.“Let’s go for a ride and a short walk now”. I waited for him to lead me to the door. He walked at a quicker pace than I imagined, but, I kept up with him. In the car he removed my ball gag so I could. “Do me again. I wish you to finish in me” I told himI rolled my legs all the way back hooking my feet over his shoulders. He was stretched out above me slamming his cock straight down into my upturned pussy. Our eyes were locked together in a passion filled dance as he pounded his swollen hot rod into my steamy pussy hole. His hands moved over the soft flesh of my creamy tits, teasing my perky nipples with his fingertips.I could feel his cock head against my cervix each time he pounded into me.. But I was just wondering about Mr Harris. He didn't join in completely but he did watch and wank; and I thought it at the time and I've been thinking about it ever since, something didn't quite add up.”“Well, he is a bit of an odd-ball, I agree. But what's bothering you, really?”“The fact that he watched his daughter having sex – lesbian sex – and that he masturbated to it. And earlier, it looked as she had been colluding in some game with him; she told me he'd sit in the corner as he usually.