This actually happened just a short time ago. I received a phone call from my in-laws. My sister-in-law Rose was having trouble setting up and accessing her e-mail. I went over to Rose's and Jack's house one Saturday morning. Jack, my brother-in-law, was at work when I arrived. Rose had the computer turned on and ready to go when I arrived. Rose is basically computer illiterate, it didn't take too long until I got things up and running.
Rose was standing behind me as I was sitting on the chair at the computer terminal. With my back to her, I asked if she understood what I did. I didn't get a reply so I turned around. Rose and I were face-to- face, just inches apart. It seemed like time froze for a few moments. Before you knew it, we were kissing each other.
Rose sat down on my lap and she opened her mouth to me. I kissed her deeply with my tongue. As we kissed I worked my hands up underneath her t-shirt and undid her bra. Pulling the bra aside, I placed the palms of my hands on her nipples and rubbed them.Rose had medium size breasts, but she had big nipples.
Everything seemed to get totally out of control. Rose was grinding down against my crotch with her ass. Needless to say, I could feel my cock growing harder in my trousers. It went on like this for some minutes until Rose stood up. She pulled her shorts off, revealing a pussy that was trimmed to a slit. She also slid the zipper down on my pants and pulled them and my underwear down to my ankles.
My cock was standing straight and proud. Pre-cum was oozing from the tip. Rose took hold of my shaft and arranged herself above my cockhead. She then sunk down. She worked her pussylips all around me. She slowly moved up and down my thick pole. Rose threw her head back and started to make love noises. I then moved my hands to her hips and pushed her down on top of my cock completely.
The air left Rose's lungs as she felt my cock drive up into her passage. I began to move my hips up and feed her my cock. I was kissing her and pinching her nipples as we fucked there on the computer chair.