Beach Tug

One Sunday I took myself down to the local nude beach for a bit of sun and a swim. I had been there about an hour when I decided to get up and stretch my back and legs. I walked to the water to have a quick cool off and on my way back I noticed a couple under a tree about 100m away. I didn’t think too much of it until I saw the blokes arm moving, he was sitting next to the lady and she was lying on a towel. I continued walking toward their general direction but not directly at them, and the closer I got the more I could see. He was pretending to be rubbing moisturiser on her but in reality he was rubbing her shaved mound. They were in their late 20s as a guess and she had large round breasts and a nice trim figure he was similar to me in height but a little heavier. My cock then grew a mind of its own now that I was only about 15m away and without thinking my hand reached down and started to stroke it. He continued about his business and she stayed laying down sunnies covering her eyes, not moving apart from the occasional twitch from the rubbing. After about 5 min he must have realised I was no threat to them and he leaned in and whispered something to her, he then sat up and motioned for me to come closer. He pointed to a spot about a metre away from where they were and put his finger to his lips indicating that he did not want me to speak. I positioned myself on my knees looking straight at her glistening pussy and he started rubbing her clit a little harder and faster, she opened her legs a little more and I could tell that she was getting close. I continued to jack my rock hard cock as I could feel that familiar tingle down below. She started shuddering as he kept on furiously rubbing her clit and to this point she still hadn’t looked up. I was enjoying the show and propped up on my knees as I pumped the biggest load of cum I had dumped in ages about a hands width away from her legs. I squeezed the last of the cum from my balls and cock then hopped up and gave the guy then ‘thanks mate’ nod as walked away. I got back picked up my towel and turned around, he was pointing to the load on the ground next to her. She was smiling and looking around not knowing who had left it. My cock started twitching again but it was time for me to go.