Reluctant sex with old guy in public

VERSION 2: It was quite a hot day and I was feeling horny so I went down to my local river to cool off. I like dogging, but I decided to try something different this time by lying down with my tits and pussy hanging out and let a random stranger stumble across me. Unfortunately it was an old guy who caught me. He started groping me and before I knew it, he had his cock in me and started pumping away. When he was finished using me, he squirted his load into me.