Let's see how he takes it

I left my room and with a little trepidation about inviting a stranger into a home that wasn't actually mine, reminded myself to be confident around John. Confidence is sexy. "Hi John, do you have a minute?" John looked up from his computer and turned on his office chair to face me. He had changed into some loose fitting clothes, just shorts and t-shirt. "Sure. What's on your mind?"

I knew he would not be so open to the idea of me inviting a random guy over the following day, so I took advantage of the situation. I was still wearing my swimsuit and only a short skirt to cover the lower half. I could see while John was being more reserved than at the beach, he was still ogling me. I moved quickly but gracefully and sat in his lap. I made sure my ass landed where his cock should be and I wrapped my arm around him to keep me in position. I then continued as if this was the most normal thing in the world. "I wanted to talk to you about tomorrow's plans." After the initial shock of what I was doing John had the other issue of a growing boner progressively pushing up into my ass. I could take advantage of that. John struggled with his words as he struggled with his dick. "I hadn't...em, ugh, made any unn, plans for tomorrow."

Slowly and very carefully I started to move my hips back and forth, so that there was a constant moving tension on John's dick. I was slowly grinding against him, he could feel it, but it was still just on the side that I could pretend nothing was happening. But clearly it was having a wonderful affect on John, he could barely focus. Now was the time to introduce Tom. "Well, I was thinking I might spend a bit more time with Tom. You know, you met him briefly at the beach today." At the mention of another name, John took notice, he looked a little displeased, so I added a little more tension to my ass, which certainly relaxed him. "You mean...hhhh, that big guy from mmmm, today?"

"Yes, he just called me up and wants to hang out. I thought he might come over here for a couple of hours tomorrow. Is that okay with you?" John was clearly not okay with this. I needed a little more to get him over the edge. I dropped my phone. "Oops." Quickly, I pulled my panties to the side, so my asshole would be visible, but kept my dick hidden. I bent down to pick up my phone, ever so slowly ensuring that my skirt rode all the way up. John had a perfect view of everything. I looked back at him, his eyes fixed on my ass, his hand reaching down and pulling the tip of his dick free of his shorts. "So is it okay with you Uncle John if Tom comes over to play?" John just nodded. Time to finish this off.

I carefully, but excitedly jumped back into John's arms, landing my bare ass on his partially exposed dick. I could feel the head, just at the entrance to my ass. I moved up and down as if excited shouting, "Yay!" But my acting had to go on just a bit longer than was natural, just long enough for John to start cumming. I wanted to say for all of his jiz, but it would be too suspicious. So I got up and bounced away without looking back, but I knew John was still spewing cum as I left.