One night we were fucking and she said her SIL might want to fuck me I figured it was just dirty sex talk but later she told me it was true! I was a l...ttle stunned and really turned on "so would you fuck our SIL baby" she asked "you know I do" that answer gave her a huge smile. So she informes me in 2 weekends the three of us are having a night out together and the house will be empty when we get home. At the time I said still thought she was just talking "oh really" she says typing on her. A week passed - I got a call from her -I was excited to see her number and attended- she said " Master I,My husband and my husband's mistress decided that you will be my perfect master" as you are a nice person in heart and sadistic in BDSM " I replied her: Well that is a good decision. Prepare your clothes and be ready, I will come to your home at 5 and pick you up. At 5 I went to her home, she received me at entrance and Introduced to Katherine's husband's mistress - she was Asian women with. Even her in laws were not there as they had gone for a hospital for some check up. Even her children had been to school. I just called her up. She told she was “work from home” and prepare some training report and was busy. She told that nobody is in home.I thought it was the right time. As soon as she said that no one was in home my dick got increased by few inches. I took half day leave and went to home.I just the rang the door bell. My sister opened the door with a phone on hand. She was. ”We went into the den and sat on the couch. I figured I would start with the basics. “There are four positions that are the most popular. Missionary, cowgirl, reverse cowgirl, and doggy. You need to be familiar with those four. Other positions are variations and fun to experiment with.” I tried to explain the merit and variables of the four positions. I kept looking at mom and all I saw was a quizzical stare. I knew I was failing miserably. I kept stumbling over words that described the more.