I've been reading stories from here for a while and I thought it was time I sent one of my own in. I'm not gay, but sometimes they just happen. One night I was sleeping over my friend's house, call him Pat and we were down his basement with some sleeping bags set up on the floor. We got in our sleeping bags but weren't tired, so decided to play truth or dare. First we were both just saying truth and getting out some stupid things like who you like.
I decided to choose a dare, so he dared me to pull down my pants and hump his chair between the cushions. I accepted and did the dare and then told him to do the same. He did and things began to get interesting, daring each other for about an hour to hump different things.
It was his turn to dare, so he dared me to sleep nude. I accepted and got up starting to undress. I was horny and had a hard on. I had just taken off my pants and boxers when all the lights were turned on. It was his sister and a friend who came walking down the stairs. They are both about 16/17 and saw me naked. They just giggled a bit before walking back up stairs, so we decided to end the game there, but I was too horny.
I waited for him to go to sleep before running into the bathroom and masterbating to a great orgasm. I'm now 14 and still masterbate to the thought of what could have happened if his sister hadn't gone back up stairs.