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Unexpected surprise

I was just 18 and lived in a small town, one afternoon I decided to walk downtown instead of driving. I came up to a corner and there was a guy on motorcycle and I said hi. He asked me if I lived there and if I could help him with a graduate project. I said sure and he said that he was doing a study and ask if he could take a couple of pictures of me without showing my face. I asked what kind of study and he said it was on male genitalia. I said sure why not so I jumped on his bike and we went to a quiet place by the river that I had been to before. Once there I dropped my pants and he was very clinically as he took pictures of my cock. Not sure why but I started getting hard as he took a couple more. My cock is 8.5” and nice and wide , and now it was rock hard. He asked if he could touch it and wrapped his hand around it and started to move his hand up and down the length. Some precum escaped and he licked it off and then took my cock into his mouth. As the pace quickened I felt myself building to a big orgasm, and told him so. He took me down his throat and I exploded. He stood up and said that the study was over and he would drop me off anywhere I wanted. I asked if I could see his, and he pulled his out for me. Feeling that I should not be rude I wrapped my hand around his shaft. He was probably 6 inches uncut. I lowered my head and took his dick in my mouth. I swirled my tongue around the head and under the foreskin. I started moving up and down running my tongue as I sucked his dick down to his balls. Then he stiffened and unloaded his cum down my throat. I cleaned him up with my mouth and tongue and he closed his pants and thanked me for taking part as he dropped me off. I walked home still trying to comprehend what just happened. It was a good afternoon.

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