I have had a thing going with one of my nieces for a few years now. She is exactly 20 years younger than me. At first we did the usual masturbation with each other but one day discovered something that we both like better. First we get naked and play around a while, you know, kissing, licking and me sucking her tits. Once I am leaking precum and she is good and hot we get down the the best part. I lay on my back on the bed and she straddles my body. She reaches down and pulls her pussy lips apart. She then presses my dick back against my belly and sits so that her pussy lips are on either side of my dick. She then begins to slide her pussy up and down the length of the underside of my dick. As she moves her ass back and forth, the entire length of my dick is rubbing her pussy from her vaginal opening all the way up to her clit. She is wet when we start doing this but gets wetter as we go. Sometimes I can feel the hot pussy juice as it gushes out onto my dick and balls. The friction of her clit rubbing on my dick causes her clit to get harder and larger. It is rubbing directly over my dick so the direct stimulation causes her to cum pretty quickly, not to mention what it is doing to me. My dick is trapped between my belly and her spread pussy lips. It feels as though I am fucking her but I never enter her vagina. She never stops after one orgasm and will usually have three or four. Her pussy gets wetter with each orgasm and after three or four the both of us are slopping wet. As she slides her ass back and forth you can hear the slopping wet noise. It sounds just like two people fucking. I try to hold on as long as possible but I have never made it past her four orgasms. And then I cum. I will grab her by her hips and push my dick up against her pussy and I start moving my hips as much as I can as my cums shoots out all over her pussy. I am sure some of my cum gets into her vagina but she is on the pill. By the time we stop, the mid-sections of both our bodies are covered with a combination of her pussy juice and my cum. Before she gets off me she always bends down and kisses me and says, "You sure know how to make a girl feel good." I promise you she does not enjoy it any more than I do.