At the start of July, two days after my 19th birthday I was at home with my boyfriend Scott. My mom and stepdad were at work and I'd decided I wanted to try anal sex for the first time. We were in the kitchen, I was all but naked, only my socks left on and Scott was completely naked. He was lay on the floor and I was just about getting used to his dick inside my butt as I sank down onto his cock, when I saw movement out of the corner of my eye. Quickly looking around I saw my stepdad standing in the doorway. He was watching us fuck, but that wasn't what made me stare, it was the size of the bulge in his work shorts. I don't know how long he'd been stood there, but once he knew I'd seen him, he smiled and walked quietly away into the lounge.
Scott and I quickly dressed and Scott left scared my stepdad might beat him up. I went into the lounge to talk to my stepdad, but my stepdad wasn't there. Needing the bathroom I climbed the stairs and only because I heard a soft moaning coming from the left, did I look in the direction of my moms and my stepdads bedroom. I was stood rooted to the spot for a couple of minutes as I looked through the wide open door. Stood perfectly still I watched my stepdad masturbate on their bed. His erection was much bigger than Scotts and even from that distance I could see the pre cum leaking from his massive cock head. Staring at him wanking was if I was in a trance unable to move.
He knew that I was there and I knew he knew it, but it didn't make any difference, he carried on stroking his huge cock anyway. When he shot his load all over the bed linen, he looked in my direction and smiled right at me. His smile and the arc of cum hiting the bed made me come to my senses. Looking at his face still smiling I finally went into the bathroom, and I'm not ashamed to say I played with myself, using my fingers to to penetrate my pussy and play with my clit until I came. After showering I went into my room and waited until my mom came home.
Nothing was said, other than my mom wanting to know why her freshly washed bed linen was being washed again. My stepdad said he spilt his coffee on it, but we both knew that wasn't the case. Later he came up to me and said "If you don't tell, neither will I".
I've kept it to that, but I can't help but get aroused now each time I'm around him. I've seen how big his cock is and even though I've continued to have anal sex with Scott, I'm now wondering how much better it would be with my stepfathers large cock inside my butt, instead of Scott's six inches.