I am married to a very pretty looking girl (Sonia) and it’s been 6 years now. I have a very hot looking sil (we call her Cherry) who is younger than...my wife by 3 years aged 25years and unmarried. Well the story goes like this. We had a very normal relation with Cherry and she used to come often to my place to meet her sister and me. And I used to be quiet casual about it.We are a nuclear family so it’s only me and my wife alone in the house. I always had a very wild sex life and my wife was. . to a robot. My mother went away for a three day weekend, and left me alone. Alone except for her personal service robot. Though my mother would have never mentioned it, I knew that "personal service" meant more than cooking and cleaning, and I was determined to try it out.It may seem odd to you to hear this, but ever since I found out what the true capabilities of the robot was it seemed so erotic to me. I would have dreams of strong, robotic men stuffing my pussy. It got me so hot.I had. She turns her head and grins over her shoulder. Stepping a bit closer to the bed Nathan brings the belt down hard on her butt making her moan feeling the sting against her ass. He repeats and repeats and repeats even harder. Seeing the red marks on her ass makes his cock jump in the pants. “You always had a great ass and knew, how to get it used”, Nathan said as his hand came down to her bare ass; the hardest once again. The pig ass bitch was not going to stay quiet and quickly commented that. Sarah felt his cock twitching inside her. She loved it. But now it was her turn. She moved off his cock, feeling the come in her ass still. She pushed him forward, leaning him against the counter. Applying the hand soap, she eased her cock into his ass. "I love being inside you, baby. Your ass squeezes my cock so nice," whispering in his ear. "I'm going to fuck you now. Slide my cock in and out of your ass till I come inside you. Do you want that?" "Oh yes, baby. Fuck me!" She grabbed his hips,.