I have been visiting this site for ages and finally have a story to post
My girlfriend and I have been together for over a year. She is the first girl I have done anything with and her religious upbringing has made her quite shy sexually. She is starting to get more adventurous though.
Over new years (summer in the southern hemisphere) we stayed in a lake house with some friends from college. It was a short walk down to a very small beach where we went swimming to ring in the new year. On the way back (with a bit of dutch courage) I suggested to my girlfriend that we should come back tomorrow night to go skinny dipping, and she agreed.
So the next night we headed down to the beach, nervously checking for other people. It was my first time skinny dipping-what an amazing feeling! We made out in the cold waist-deep water, occasionally stopping to laugh at how naughty it all was.
Back on shore we were kissing again. I was keen to know if she would be comfortable going further in a semi-public place. She was kissing me passionately so I took that as a cue to continue. She started to moan as I played with her breasts and ran my hand down to her pussy. I began to tease her clit and she grabbed my penis and started to stroke. We made out violently as we masturbated each other. In a few minutes she was gasping for air and shuddered to orgasm, her feet almost giving way under her. Not long after that I came, shooting my load over the sandy shore.
My girlfriend was very excited by our 'adventure' and has loosened up a lot since. Last week she played with herself for the first time, masturbating to orgasm while I watched. It was the hottest thing I have ever seen.