It was my day off at work so I decided to go and visit my mother and my sister. My sister is 21 and still single, she was engaged but they ended up after dating for 2 years. After I had lunch cooked by my mother she went to visit a friend at the hospital. Well, I knew that and was one of the reasons I went there. I knew I would be alone with my sister and we could fuck all afternoon and she wanted it too. During lunch she grabbed my several times under the table.