It all began last month when my 19 year old sister got into an argument with her husband and moved in with my wife and me. All was going well, except every now and then my wife could complain about my sister's tight fitting clothes. I am 22 and I didn't mind my sister wearing tight fitting clothes.
Then things changed one day. My wife had gone to visit her parents for the week. I stayed home because I had to work. The day after my wife left, I was coming out of my bedroom, when I saw my sister walking nude from her bedroom to the bathroom. That really made me horny. I had gotten a hardon-on just seeing her petite body and her long blonde hair. She went on into the bathroom and closed the door and I went into the kitchen to get a beer. Then I went into the livingroom to watch some tv.
About a half hour later, my sister had entered the livingroom and sat down next to me. My cock got hard once again. You like what you see, she asked. Just by looking at the buldge in my pants she knew the answer. Then she place her left hand on my cock and said that your wife isn't here. I could tell that she was geting horny also as her right hand started to rub her pussy. I couldn't take it any longer, so we went upstair to her bedroom and did it. It turned out that my sister's pussy was much better than my wife's.
The week that my wife was out of town was the best week that I ever had. We had sex everyday. Of course we took a risk because I never used any condoms and my sister wasn't on the pill. She ended up divorcing her husband and moving next door to us. To this very day we continue to have sexual intercourse.