Unable to sleep last week around midday, after my night shift with my wife already out at work. I walked down stairs and discovered my step daughter Natalie totally naked, sat bouncing up and down on her boyfriends cock, taking it up the ass.
I stood and watched for some time, getting the hardest boner I can ever remember having. They changed position so Natalie was facing where I stood. She didn't first see me, but eventually as I was rubbing my cock through my bed shorts, she looked up. Smiling at me, she turned her head and told her boyfriend to really give it to her. He began to hammer into her ass, and Natalie began to moan. Looking back at me as I moved backwards a little, just enough so her boyfriend wasn't able to see me at all, Natalie slowly motioned for me to masturbate whilst licking her lips.
Taking my hard erect cock out, I saw her grin and then lick her lips again. Stroking my cock I tried to stroke at the same rhythm as she was being fucked. Then Natalie bucked backwards and climaxed hard, just seconds before I saw her boyfriend cum up her ass. It was all too much for me and I busted my nut all over the floor in front of me. Again Natalie grinned widely watching me cum and then winked my way.
I returned to bed after wiping up my mess, and eventually fell asleep, but not before I re ran the whole thing in my head.
Later that day I was in the kitchen making myself some coffee, when Natalie walked in and kissed me on the cheek. It was something she never did, nor was the movement of her right hand down to my cock. Rubbing it hard she said "Maybe you should have joined in, .... wouldn't have cared less". Before I coule reply the front door opened and in walked Natalie's mom.
Since that day I haven't seen much of Natalie and when I have my wife has been there. But I did see her briefly yesterday and she smiled before she said "Moms out tomorrow night with my aunt. ....'s away playing football, wanna visit my room and see up close what you missed the other day".
I answered the only way I could seing that was how my cock reacted. I told my eighteen year old step daughter, before I held her to me and kissed her hard, I'd love to fuck her.
Now we'll see if she's up to her word tomorrow, won't we!!!