I came home this evening from work, and was getting around. My kids were upstairs sleeping. My wife is at work, so my kids usually hang out until I get home, and on weekends, we stay up late. Tonight, when I got home, I looked upstairs, and it was quiet, so I figured they'd done things, and gone to bed early. No big deal. I come home, clean up, and end up watching porn late at night, and masturbating. I do this 7-8 times a week. I can't help it.

Two weeks or so ago, my step daughter came downstairs. We ended up talking, making jokes, talking smack, and cracking nasty comments. I felt dirty as fuck afterwards, but she convinced me to jerk it and let her watch. I came in the paper towels I typically use, and she watched me do it. When I finished, she just looked and said "Damn. that was pretty hot. I'm gonna go to bed. I'll talk to you in the morning". When she went upstairs, I felt like a nasty ass perv. I was just sitting there, wondering what the fuck I just did.

Tonight, when I came home, I was at the computer after my shower, and she walked into the room. She looked at me, and kind of joked "more porn" to which I looked at her and said "Can I talk to you about that?" She said sure. Sat on the edge of the couch, and I said "I'm sorry I did that. I really shouldn't have. It's not like appropriate and shit, and it's kind of wrong". She looked at me and shrugged and said "why? I mean, so I saw your dick and all. It's no big deal. I've seen that in porn and stuff, and not like I'm innocent. So what's the big deal?" I just said "well you're my step daughter, like my own kid and all that. And it's kind of nasty to do that shit. I'm older, and all" and she laughed and said "well, people do weird shit all the time. Don't lose sleep on it". I just shrugged and said OK.

I was at the computer, and looked at her. I said "what?" and she said to me "Not to be a fucking weirdo, but after I watched you do that shit? I went upstairs and got off. I kept thinking about what it'd be like to fuck you" I just sat there speechless, and said "you're 17. That's just not an option" and she shrugged and said "I've had sex with two other guys. They were shitty. It sucked. I know it's fucking perved and weird and shit, but I dunno. Figured you were open minded, and not like I'm gonna narc. And I know mom is a lousy lay, but it's whatever". And she got up to walk out of the room.

I walked up behind her and I put my arms around her and said "come on. It's NOT like that" and she turned around. She's bigger, about 5'4 and about 175 or so. A bigger round butt, and long hair. Small boobs. I couldn't help my dick getting hard. I kissed her. She backed off in shock. This wasn't a step dad kiss. This was full on the mouth. She looked at me and said "Holy shit" I said "well, you said it" and she didn't say anything.

I pulled her pajamas down. I pulled her shirt up. She didn't even fight. And she looked at me. She pulled down my shorts, and my underwear, and yanked my shirt off. We were standing there and I said "Ok, now what" and she just started kissing me. All I could do was feel her small boobs. God, it felt so fucking creepy. I'd never done anything like that.

We ended up on the living room floor. I touched her, fingered her, made her come, and I let her stroke me. She was on her back, and I stopped. And she said "I'm on the pill. So it's whatever" I couldn't stop. I stuck my dick up against her pussy hair, and I inserted it inside her. I started pushing.

She was moving her big hips, and pushing against me. I came. I really came hard. I was squirting, and I kept gasping Oh God. She was laying there, her eyes wide open, bugged out, and I was emptying myself inside her. When I stopped, and I realized I'd just done what I did, she looked at me and said "Holy shit. That was intense" I just stopped, and I said "Goddamn. I feel fucking creepy as fuck. I'm sorry". She grabbed my ass, and said "Goddamn. Don't you do that. You shouldn't. I'm old enough to know what I want, and what I like, and holy fuck, you were amazing" I stopped and said "what?" and she laughed and said "I'm not kidding. Goddamn. That was incredible."

I crawled off her, and laid on the floor. She got up, went into the bathroom and came out a couple minuets later. I kept looking at her. A bit of a bigger stomach, bigger legs, and her small boobs, and goddamn, all I could think about was how fucking sexy she looked naked.

I have to deal with my wife in the morning. It sucks. All I can think about is my step daughter upstairs, and knowing I just fucking came in her, and all I want to do is fuck her again and again. And again. I feel dirty as fuck, but it was just really amazing.