Swimming is great exercise

I’d been out with her a few times. We had already had sex on numerous occasions, her body soft against mine, her D cups providing more than a mouthful and her pussy sucking the juices from within me. Her kisses passionate, her smell divine, feeling her all over and hearing her pleasurable moans.
It was a really hot summer day so we decided to go swimming down at the river. She looked so hot in her bikini, her long slick wet hair clinging to her back, nipples erect straining at the fabric of her top driving me wild. I pulled her close and kissed her. She pulled away, “My mother is here”
Her mother, a 40 year old beauty therapist swimming close by in her bikini inhibiting my cock which was straining for attention.
I couldn’t wait and pulled my girlfriend close, I kissed her again and I sat on a rock just under the water. She kissed me back and I pulled her in tight. She grabbed my cock and pulled it out of my swimmers. I grabbed her bikini pants and pulled them to the side. My cock slide in so easy and the sensation of the cold water and her hot body was driving me wild.
Our movements were subtle, there was about fifteen other people swimming around including her mother so it was even hotter. Her mother swam over to us and was talking as my cock was buried deep in her daughter. Her own nipples standing out proud adding to my own visual stimulation. I just wanted to cry out loud and spill my cum right then but managed to stay controlled. 
It seemed like eternity before her mother swam away and she started to rock her pussy back and forth on my cock. It wasn’t long before I spurted my seed deep inside her; the combination of her silky pussy working my cock and all the people around was just too much. She then kissed me hard and pushed away smiling. Her mother then swam over and giving me a knowing smile before she told me that we have to talk. But that is another caper for later!!!