I had a party at my place and the following morning, the sun was out and we all spent the afternoon on my deck enjoying the weather. I was wearing shorts with no underwear and realized that while I was sitting at the picnic table, my cock had found its way down the leg of my shorts. I couldn't really do much about it and figured no one would know anyways. Suddenly I realized that this girl that was laying down on the deck, had her eyes fixed right on my dick. I instantly started get to get a hard on and tried to stop it because I'm quite large and it was going to be very noticeable. The girl sat up and got a closer look even though I turned away slightly, she followed it. Before I knew it, the leg of my shorts slid up and my cock stood straight up completely hard and exposed. No one else could see it but this girl let out a gasp then a giggle and stared at it. I grabbed it and stroked it for her and she smiled back then finally went inside. It took me forever but I finally got it back into my pants but it was such a turn on to be seem that way. I loved it and so did she I think. It was accidental at first and that's the best kind of flash.