I was part of a college age/young adult church group when I was in my mid twenties. When Roxanne and her best friend, Diane graduated from high school and turned eighteen they decided that they should join our group. Actually, they were the youngest ones there but we made them feel welcome, besides they were both very cute.
I had an apartment not far from the church and as it turns out, not far from their houses either. It wasn't uncommon for my friends to hang out at my apartment. We would often swim in the pool or better yet, sit in the spa and drink daiquiris. Roxanne and Diane would join us now and then and I always enjoyed looking at their tight young bodies or playing a little footsie with them in the spa. One time the spa was so crowded that Roxanne ended up on my lap. She must have liked it because a week or so later she showed up at my apartment door early one evening and asked if she could just hang out. It was fine with me. She told me that she was wearing her bathing suit under her clothes in case we wanted to get in the spa so I took the hint and put on my trunks and grabbed a couple towels.
When I came back into the living room she took off her shirt and shorts. Even though she was wearing a one-piece, the idea of watching her undress was really hot. Thankfully, I was holding the towels in front of me. We walked down to the spa and hopped in. Roxanne quickly cuddled next to me and my hand found its way onto her leg. It was not well lighted by the spa and being a weekday night there was nobody else around so we kissed and rubbed a bit.
I confessed how much I had enjoyed having her sit on my lap the last time and she confessed that she could feel how hard I had gotten under her and how much she liked that. By now I had pulled her leg up onto mine so that her legs were spread a bit and I slid my hand up the inside of her thigh as I kissed her. We sat there in the warm bubbling water with my hand rubbing her crotch and her leg rubbing against my firm shaft. She slipped up onto my lap again and this time scooted herself right on top of my hard cock. I let her rub her sweet ass against my ever growing cock as I held her hips.
Finally, I grabbed her hips tight and told her, "Hold on Honey, unless you want me to cum right here like this." By now my raging cock was peeking out the top of my trunks. She just let out a little moan and kept rubbing. The timer for the jets shut off and as the water calmed and cleared I could see that she was also rubbing her pussy with her hand. I held on tight as my cock pulsed and throbbed against her ass and I came in the water. I pushed her off and we could see white puffs of cum floating in the water.
"Is that what I think it is?" she asked.