At home bored two weeks ago I wanted to get my bicycle out and go for a ride. My dad was down in his games/bar room (Our basement) with Robbie his best friend. My mom was over at my grandparents house and my older brother was out, probably screwing some pretty piece of ass.
I shouted down to my dad but got no answer, after I found lots of his weight training gear in my way. Walking down the stairs into the basement, I first heard the sounds of a porn film playing. Then as I got lower I saw my father and Robbie both masturbating whilst watching it. The thing was, they weren't wanking their own cocks, they were tossing off each others. I'd been watching for about a minute when my father lowered his head and took Robbie's erect cock into his mouth.
Robbie leaned right back and closed his eyes, as my dad took in more and more of Robbie's cock down his throat. I moved right down to the last step so I could see better. Then from a much clearer view, I saw Robbie had reached over to my fathers asshole and was fingering it. My father had been sucking on Robbie's cock for about three or four minutes, when Robbie stopped my father sucking his cock, told him to kneel up, and in one movement got behind him and thrust his cock up my fathers asshole.
If I wasn't there witnessing it, I would never ever have thought they were gay. However, there I was watching my father being fucked. And I was loving every second of it. Robbie pounded my dads ass for over ten minutes, ten minutes in which I put my right hand down to my short skirt, lifted it and slipped my hand beneath my panties. I played with my clit watching and getting turned on by seeing my own father being fucked by his life long friend.
It was totally surreal, yet it was totally and utterly the sexiest thing I'd ever been involved in, even if they didn't know I was there. As if they'd planned it, my father said he was cumming just at the same time my own orgasm ripped through me. No more than twenty seconds later, Robbie without pulling out of my dads asshole, came hard and deep up his best friends ass.
As quietly as I could I climbed the stairs and went to my room. When my father knocked on my bedroom door a quarter of an hour later, I pretended I'd been asleep. I asked him when he entered what he'd been up to, he replied by telling me he and Robbie had been playing pool. I knew different but I wasn't going to say anything.
I haven't said anything since either, even though what my father was doing with Robbie was and is technically cheating. I know my father loves my mom and I also know he and Robbie have been friends since they were about five or six. I don't think it would help anyone if I let them or my mom know I watched them fuck. And besides, I'd masturbated watching my father having his rear hole well and truly fucked.