I put my towel down, lay on it and start soaking in rays. I wasn't out there too long when a heat of a different type came over me, and I start playi...g with my nipples. Soon my fingers brush down my stomach to my clit. Not satisfied with the way I was laying, I moved so that my bottom was at the edge of the top step, placing my feet on the railings on either side of the steps. I then continued my work between my thighs and over my breasts, a breeze gently caressing me as I do so. It felt. The guy had turned to allow people off and as we started off again we were now facing each other. I guessed he was about 55 roughly the same height as me at 6 feet and slightly built. He looked me in the eye and smiled ever so slightly which I found disconcerting to say the least.Another 7/8 minutes or so and I would be off train and I closed my eyes thinking of the cold beer waiting for me at home.The train lurched again and I felt a hand cross my crotch area and I opened my eyes to see this. We couldn’t be closer to each other. Literally. We’re inside each other. We’re kissing, I’m fucking her ass, her finger is in my ass, my hand is inside her pussy and with my free hand I’m rubbing her clit. This is it! Sexual Nirvana! We keep going for several blissful minutes. She’s moaning heavily while still kissing me. I can feel her ass, her pussy contract, getting tighter and tighter and finally - contracting rhythmically! She’s cumming! “Oh Fraaaaaaank!! Yeeesssss! Aaaahhhh! Mmmmm!!!” I. Jenny, my girlfriend was nineteen with a slim but nice figure and a very pretty face but I had suspected her of a couple of affairs during the time that I had known her. Nothing was proved so I gave her the benefit but the suspicion was still there.It was Friday night and we had finished dinner and decided to go for a romantic stole along the beach. Almost as soon as we hit the beach she started on me, telling me about my shortcomings and complaining about my lack of ambition and drive. It was.