When I was fifteen my uncle Bradley came to live with us for a short while. He was having some work done on his house, so my mom asked him if he'd like to stay until it was finished. Brad is only eleven years older than me and is my moms younger brother.

I wasn't feeling too well so left school early. Arriving home I headed straight up to my room. On the way up the stairs I heard some soft moaning coming from the guset bedroom Brad was staying in. The door was half open and even though I was feeling ill, I was still very curious, especially when I heard a strange say "Yeah fuck me like that".

Creeping up to the open door, as quietly and as slowly as I could, I peered around the door. On the bed naked was a guy around the same age as Brad. Knelt behind him also naked, was my uncle with his hands holding the other guys hips, whilst he was thrusting his very large cock up his ass.

I stood and watched for as long as I dared. The sick feeling gone, replaced by a growing feeling of lust and wanting to touch myself. When they changed positions I quickly ducked back behind the door, then slowly looked around the door again. I was just in time to see the guy now lying on his back and Brad about to put his cock back into his asshole. I got to see the full length and girth of his dick as he slid it back into his gay lover. It was bigger than I at first thought and saw.

I carried on watching Brad fuck his friend for a couple minutes more before I got too scared, thinking I might get busted. Very turned on I crept into my room and as quietly as I could closed the door to. Still listening to them fuck in the deadly quiet of the house, I lay on my bed, put my hands under my school skirt and then inside my panties. For the next ten minutes I played with my pussy and clit, listening to and visulising them fucking until I came. I couldn't help myself from moaning loud as I orgasmed and almost immediately the sound of them having sex stopped.

Downstairs later at dinner with Brads friend having left in a hurry earlier, nothing was said between us. When my mom and dad were sat in the lounge later on, Brad pulled me to one side and asked if I'd gotten home early. When I told him I had, he asked me if I heard anything. With a knowing smile which told him I had, I also told him he had a huge cock. For the rest of Brads stay, it might have been awkward for him, but it was a real turn on for me and I often masturbated to the memory of him fucking his male friend.

Two years later my mom and dad were having a barbeque party for my dads birthday, Brad turned up (I'd seen him only a few times in between) with a beautiful looking woman. It was clear they were romantically involved and remebering the episode when he's stayed with us, I asked him when I finally got time alone with him, if he'd changed his sexuality. He knew I was teasing him and his response shocked and excited me all at the same time. "If you want to find out what it feels like to have me fuck you, you only have to ask. There isn't any need to sneak around and spy on people if you really want to see my dick. And no I haven't changed my sexuality, I've always been bisexual". Probably with my mouth agape and a shocked look on my face, he added "Let me know if and when you want to feel my large cock sliding up your pussy and especially your cute tight ass". He left me stood there, not knowing what to say or how to react. I'd asked for it and Brad had called my bluff.

All these years later I might not be able to hold off if he called my bluff again. He's visiting my mom and dad next month after having worked in Europe the last couple of years. Brad has asked specifically for me to be there as I now live in my own apartment. When I asked my mom what he'd said, she replied he'd mentioned something about the barbeque we had for my fathers birthday. When I gently pushed my mom for anything else he'd said, she added "Your uncle mentioned something about you and him sharing an open door". My mom tried to get me to explain, but I fobbed her off, saying it was a long standing joke between us.

I know and now you all know, it's an open invitation to have sex. Even though there has been a number of years that have passed, I still get that horny feeling when I remember Brads long hard cock fucking his male friend. A little over three weeks from now I'll know for certain if that is what Brad intends. I know one thing, if he asks me as bluntly as he did at my fathers barbeque, then I'm not sure I'll be able to say no. In fact looking back through my own confession here, I almost certainly will be the person on the other side of that open door with him.