Coming down the stairs from my bedroom, I was in the hallway, and I saw the lights out in the living room. I could see the computers screen on, and I was watching my step dad. He always keeps late hours. I've known that for years.

But I finally realized why he's stayed up as late as he usually does. Standing in the hallway, leaning against the wall, he didn't realize I was even there. I watched him. He slowly pulled his shorts down. I stood there in shock, as I could see from the light on his computer monitor, his shorts around his ankles, and his cock sticking straight out.

I watched longer, and I was hiding far enough back I knew he couldn't see me. He reached up to grab something, and I realized that it was a condom. It blew my mind. I know on a rare occasion when him and my mom do fuck, having two kids, and knowing my mom is fixed, they don't use condoms. I wasn't sure what he was doing. Until I saw him unwrap it, put the wrapper on his computer printer, lean back in his computer chair, and wrap his dick with the condom. I saw him pull it all the way down, and I just stood there. He didn't even look around (he might have seen me if he did), and he leaned back in his chair.

I saw him move his computer mouse, and I stood there watching. I had never seen this side of him before, and watching him move his hands slowly, I feel dirty for admitting this, but I got really horny watching it. I'd never seen his dick before, and I'd especially never known that he masturbated using condoms. I stood there, and felt myself getting turned on. Honestly, I almost wanted to walk into the room and see what would happen or where it would go. But I was afraid, so I stood there watching.

I heard something on the computer screen that sounded like a gasp or a moan. And then realized he was masturbating to porn. I stood there and watched him stroke his dick slowly. And then gradually he started moving faster. And I heard him talk. He was talking to the computer. And God if he didn't lean back and say "Oh God Emily. Oh God Emily. I'm going to cum" and I realized he was fantasizing about me. Whomever was on the computer screen, obviously having sex, he was pretending it was the two of us. I had never seen this before. Ever. I wasn't grossed out or mad. I thought it was dirty, and i wasn't sure what else to think.

And then like 30 seconds later, he grunted, thrusted, and he gasped "Oh God Emily I'm cumming. You feel so good" and I watched as he had an orgasm in the condom. Then stopped. Leaned back into the chair. Breathing heavy. And slowly took the condom off. Wrapped it in some white computer paper, pulled his shorts up, and headed into the kitchen. As he got up, and went into the other room, I had to sneak back upstairs.

I went up to bed, and laid there, just realizing, that I'd seen my step dad fantasize, using a condom, and having an orgasm, fantasizing that he was fucking me.