Fantasy Accomplished

My gf wanted to have public sex but not where she would be caught and in trouble. It was a warm fall day with a nice breeze off Lake Michigan so we were north of Sheboygan on a road trip. As we drove, she was getting hot and playing with my stiff hard cock.. she unzipped my pants and sucked it as I tried to drive and finger her soaking wet pussy... I found a somewhat deserted beach this weekday and we took our towels and walked to the beach.. As we got there, no one was on the beach and we walked farther south to find a good spot. I could tell from her face that she was more than ready and I was hard... we found a large boulder by the water line with a smaller rock next to it. I put the towels on the warm sand and we started to kiss, fondle, play with each other and in not time, we were naked as the boats went bye. We 69 as I tongued her delicious pussy, sucked her clit and she came twice.. I looked around and we were somewhat alone (other than the boats) and she wanted to stand on the rock and hug the big one as I fucked her from behind standing up.. The height was just right and I heard her screaming in joy with each stroke.. the warmth of the sun on the rock excited her large nipples and she loved the feel of it. With every thrust, she let out juices and cried out after about 10 mins of outdoor fun. We kept going till I came deeply inside of her and she collapsed in my arms... Then we heard the cheers from the boats and horns blaring as 4 boats had slowed down and enjoyed the fun. Somewhat embarrassed, we went to our towels and covered up as the left in cheers.. we didn't see anyone on the beach so we went after each other again and both came more.. finally laying flat on the towels, sand in places we would find later and just the joy of being together and completely sexually spent. We dressed and walked back to the car. As we turned off the beach onto the walkway, another couple came up and we laughed thinking what a great show they had missed...