Cheated on my wife by being used for a revenge fuck

So, the sex life with the wife has taken a dive. We're in our 40s and she's lost interest. The few times a year we do it, she's not really doing much but waiting for me to finish. She's mentioned before I might want to have a sexual relationship elsewhere meanwhile still be married, so I guess I haven't really cheated in thus story.

My step son, Tom and his girlfriend, Carly live with us and have done so for a couple of years. In the last 6 months, Carly has put on a fair bit of weight. As a result, it's been vvery obvious that Tom has been going out and cheating on her. Carly has also been showing an interest in me. Early is 22.

Due to her weight gain, he boobs have gotten much larger. I haven't been able to not notice and steal a peak when she boucnes through the lounge room. She's definitely caught me looking more than once.

Carly's intentions became more obvious when she "accidentally" walked in on me un the shower, twice. Both times she was topless as though ready to shower, he large tits in full view. Because of the first time she walked in on me, I'd started fantasising about her when showering. Because of this, the second time she walked in on me, I was fully erect. She had a good look and liked what she saw. Also, I say she "accidentally" walked in on me with quotations because it wasn't an accident. Carly doesn't even use that shower, she and Tom have their own. So it was clear.

Anyway, one Saturday night, my wife had gone to work, Tom had gone out to cheat on Carly and I was in bed reading. Carly made her move. She walked straight into my bedroom naked. I put my book down quickly and she pulled the sheets back. I was just wearing my boxer briefs. Carly didn't hesitate, she got on the next to me, pulled my briefs down and started sucking my cock. She was pressing her big firm tits into my leg as she did it. I got rock hard, very quickly.

I pulled her on top of me she she was straddling me, leaning forward with her big tits in my face. I could feel her cunt was already wet against my cock, so I reached down and put myself inside of her. I had her fuck me like that for a few minutes, while sucking her bit tits. She orgasmed on my dick very quickly.

Carly then very quickly got off my dick and started sucking again. I felt I was about to cum and let her know, but she kept sucking, working my shaft with her hand. As I came, I could feel my throbbing cock painting the inside of her mouth. She waited until I was done, then skilfully took my dick out of her mouth without any cum coming out. She swallowed.

I then got on my knees beside the bed and had her lay back, spread eagle and I ate her pussy. Licking up and down her pussy lips then flicking her clit with my tongue. I did this for a while when she started moaning hard. Knowing the sign, I bored my tongue into her clit forcefully and vigorously manipulated it. She came again and drenched my beard.

I then flipped her over so she was leaning over the bed and had her put one knee up. I fucked her again doggy style. Her nice round arse cheeks clapping my pelvis as I drove into her. She had yet another orgasm.

I then laid her on her back and told her to push her tits together. I fucked her tits and as I was about to cum, Carly took hold of my cock and jerked me off all over her big tits. I had nothing left, my balls were drained and Carly just lay there with a big smile on her face and my cum all over her big tits.

That was the first time we fucked...