My niece was attending college not far from us and she would occasionally come visit us for the weekend. Her mother lived several hundred miles away. Her mother and my wife are identical twins. Her father was killed in an auto accident at an early age, and left her mother with a lot of money. Her mother had never remarried, but was a well-know socialite and had many boy friends, not needing a husband to support her. Mandy apparently had a liberal education growing up. Her mother was very open with her, she being an only child, and they had a great relationship.
Mandy was attending summer school, and her apartment roommate was away for the season, so she would come over and spend the weekend and enjoy our swimming pool. I would occasionally steal glances at her lying on a float in the pool sunbathing. She was stunningly beautiful, as were her mother and aunt, my wife. She had dark blonde hair that would bleach in the sun, beautiful blue eyes, and light golden tan skin. Her father had been blonde; her mother and my wife were striking brunettes. I often had fantasies about making love to her. She and my wife, Tracey, were great friends, and I would often overhear them joking and talking about sex.
My wife and I had developed a rather dull, routine sex life. Usually while I was in the bathroom shaving she would come sit on a chair next to me where she would apply her makeup, and she would take my limp dick out of my shorts and suck on it, making it big and hard. I was in pretty good shape for my age, except for a slight paunch, but my best asset was a thick 71/2 inch dick with a big purple head when aroused. She would suck on it for a while, then would stand, dropping her robe, and would bend over at the hips, holding onto the sink, and I would enter her from behind. I would reach around her and caress one of her large dangling breasts, gently pinching her nipple.
With the other hand I would reach down between her thighs and stroke her clit, while slowing plunging my dick all the way in and out. After a few minutes I would get close to having an orgasm, and would pull my dick out and rest a few seconds, waiting for the urge to subside. She would take my big wet dick in her mouth and suck me off, licking her pussy juice off of it. I would cum in her mouth, and she would swallow it, thereby not making a big mess to clean up. I think she loved sucking cock more than anything else. We hardly ever had sex any other part of the day, since we both had very demanding careers and were usually too tired in the evening.
I was pretty sure she was having an affair with a guy she worked with, and at first it bothered me, but I thought what the hell, I had had a couple of affairs myself. Anyway it didn't appear to be too serious or a threat to out marriage-she was probably just sucking his cock and doing the same thing we did, but in the office instead of the bathroom. Like I said, she loved to suck cock, and apparently would climax while doing it. We never talked about sex much, and we had never been very adventurous. She seemed to be satisfied with what we did, but I wasn't; I wanted more but wasn't too sure what I wanted.
One Saturday when Mandy was visiting, showing off her beautiful bikini-clad body in the pool, I decided I would grill some steaks in the evening. After we ate dinner and drank a couple of glasses of wine, we watched TV for a while, and I became very sleepy and decided to go to bed. They said they were going to bed soon. After I slept a couple of hours I awoke and had a huge erection and was horny as hell.
Tracey was soundly asleep beside me, so I went to my study at the opposite end of the house and turned on the TV. I decided to slip a porno tape in the VCR, and took my dick out of my shorts and slowly began stroking it while watching the action on the tape. Then I tucked my dick back in my shorts and went to the kitchen and got a bottle of wine and a glass and went back to the study and resumed stroking while sipping the wine. I was sitting on the small sofa in the study engrossed in the movie and my dick and feeling warm from the wine, when I heard a small voice over my shoulder.
"Uncle Dan, what a naughty boy you are!" I was totally shocked and tried to put my dick back in my shorts, not succeeding because of my fumbling hands and the size of my dick. She said, "Oh, don't do that, leave it out!" and came around the sofa and sat down beside me. She was wearing a very short sheer nightgown with nothing underneath, and I could easily see her round firm breasts bulging underneath it. She put one arm around my shoulders, shoving her breasts a few inches from my face, and reached down with her other hand and grabbed my cock. She slowly stroked it up and down and said, "Damn, Aunt Tracey said you were really hung...I always wanted to see for myself."
I could barely talk I was so nervous, but managed to say, "Mandy, we shouldn't be doing this. You're my niece!"
