Opening their bedroom door and watching him fuck my mom from behind was the start of it all for me. It wasn't their sexual act that got me hard, it was looking at my step fathers massive cock as it pounded away at my moms asshole. All I kept thinking as I stroked my 15 year old cock through my shorts was "I wonder what it would feel like up my asshole". Before they noticed me, I went back into my room and masturbated.

The following morning (It was a Saturday) I met Sam, my step father, as I was about to leave the house after breakfast. He smiled at me and called me over as he stood next to his pickup truck. As I got close Sam put a hand on my shoulder, looked down at me and asked me "Did you like watching me fuck your mom last night". I couldn't believe he'd seen me. Stuttering I replied something like "Oh er I er um er um er" There wasn't a reason I could give especially when he said "When you're older, maybe hey" As Sam said it he touched his cock through his shorts.

We both knew then he'd rumbled me and also I knew right then, I was at least bisexual if not totally gay. For the next two years I held a not so secret torch for Sam. Only his work, my studies and finding out I loved pussy, stopped me from taking advantage of him earlier. As it was, it really began for me when I found him asleep on the couch. My mom was at work and Sams huge cock was poking out of his lounge shorts. It was my turn to look down on him as he lay asleep. It was also now or never.

Dropping to my knees, I put my lips to the tip of his cock head and kissed his dick. It was the first ever time I'd touched another guys cock let alone what I had in mind, but it didn't stop me from sucking in his cock head. He moved a little, but didn't awaken, so I carried on sucking his cock feeling it grow in my mouth. Sam startled me when he said "If you're going to do it, let me take my shorts off". I removed Sams shorts as he sat upright. His cock was straining as I released it from his shorts and it sprung forwards. "It's all yours, you've wanted it for long enough" Taking hold of my step fathers dick, I opened my mouth and let it slide over my tongue. It was something I'd envisaged a thousand times or more and something i'd written about in my daily diary. Feeling Sams enormous cock fill my mouth, was far better than any imaginings I had. So with his obvious blessing I began to give my first ever blow job.

Every inch of Sams huge cock was licked sucked and worshiped by my mouth and tongue. If I thought it was big when I saw him fucking my mom from their bedroom door, then having it in my mouth only proved to me it was much larger than I remembered. His size didn't stop me from enjoying every second of licking, sucking and tonging Sams cock and balls. Sam didn't say a thing, he just let me experience his dick as I felt was right. His only comment came after I'd been lovingly sucking down on his dick, taking in as much as I could. My mouth and lips had moved slowly down his cock taking in around six inches, just over half his cock when Sam said " I gonna cum, I want you to swallow it all". Seconds later I felt his cock swell and then his cock erupted in my mouth, filling it and my throat with his hot sticky cum. I gagged a little but Sam held me, making me swallow with his cock still in my mouth. It brought tears to my eyes, but I didn't care. I'd sucked off my step fahters cock and boy was I deleriously happy.

Finally finished cumming, Sam let go of my head and allowed me to let his cock slip out of my mouth. Lifting me up so we were face to face, Sam kissed me hard. I returned his kiss, the same as I'd done with girlfriend many times before, but that kiss meant more to me than any kiss previously, it meant I'd let Sam do anything to me. Almost reading my mind when we stopped kissing, Sam put his mouth to my ears, as if someone might hear, he whispered "Next time, I want to suck you too and then fuck your asshole". Without looking back at his 17 year old step son, Sam got up walked upstairs and got into the shower. An hour later I was sat at the dinner table with Sam and my mom eating our evening meal. It was if nothing had happened, and everytime afterwards, until I moved out three years later, that was exactly how it went from there.

My diary, which I still write, is how I remember what was said and when. It also takes my feelings down and what events shaped the person I am. In an earlier diary, the same one I took this extract of my life from, it reads "Sams massive cock pushed past my sphyncter muscles, making me scream out in pain. It was the first time we'd had anal sex, after me sucking his cock so many times before. I'd always put him off as I genuinely didn't think my asshole would take his huge cock. I was so wrong. The pleasure Sam and his cock gave me today was the beautiful start of our full on sexual adventure".

There are many many more entries in that and other diaries about myself and Sam. All have now been transfered to an online diary as I'm moving in with my fiancee soon, the paper versions having been destroyed. She knows i'm bisexual, but she doesn't know about Sam and myself. As for Sam and me, we still have sex together sometimes when I visit, but my visits have become less frequent, not because I don't like sex with Sam, I adore him fucking me with his massive cock, it's because I love him too much to keep him tagging along after I get married.

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