Jacking Underwater

My girlfriend dared me to jack off for her. She said I had to do it upon her command. Of course she asked me at a public beach in Wisconsin. We were in the water and only four people were on the beach. I pulled my trunks down as I was neck deep in water. I jacked off and learned two things... it takes longer to cum when you are in cold water and also that cum floats. A couple of minutes later some woman walked into the water and swam. I seen my load stuck to the hair on the side of her head. I was embarrassed cuz it was a little gross. Next time I will clean up my load or ask her to swallow. Happy jacking & Jillin.