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Graduated to swinging

I had known that my parents were swingers since the eighth grade. They gave me good education on what that meant. I always had access the their porn cabinet. I liked it when Dad and Mom dresses up to go swing because my five feet six inch, forty two year old size six Mom was a knock out. Natural D cup titties mounted high on her chest accented her package. Now Dad was six five and two forty five pounds, and he was hung. Nudity was a common practice on our hundred acre compound, but my parents never fucked in front of me.

For my twenty first birthday, they invited me to join them at a house party. They even purchased me a new dark blue sports coat and gray slacks. Even though I was far from a virgin, going to a sex supermarket, as Dad called it, made me was a little nervous, partly because I was probably going to see my parents fuck and I also had an aunt and uncle who regularly attended. As we walked in I was introduced to the couple who were hosting the event out at their ranch. Alcohol was flowing freely but neither my parents nor I are much drinkers. The rules were explained and food was set out for all to enjoy. As I reached for a dip and cracker dish, I bumped into someone. I turned around to apologize and found myself face to face with my high school Calculus teacher. Her thin dress did little to cover up her forty something gorgeous body. She chuckled and said you made an A in my math class, now lets see if you make an A in my sex class. I felt myself blush a little but said I was ready to take the course.

She took me by the hand and led me to a bedroom with two queen size beds. There was an older couple already fucking doggie style in one of the beds, so we took the other one. That little thin dress quickly went to the floor and she stood there totally naked helping me out of my clothes. She said she didn't care much for oral sex, and kissed me with a lot of tongue. I played with her C cups and her clit; my nine inch dick had never been as hard. She pulled me down on top of her and spread her legs. She then guided my dick to her vaginal open. I pushed in and buried the whole thing as deep as I could get it. I started a slow pump as her legs went over my shoulders. I could feel the load coming so I picked up the pace slammed into her. She shook with a spine rattling orgasm as I emptied my balls into her. We lay there a few minutes, then she said I will give you an A+ for that fucking; you are as good as your Dad

I looked up and Mom and Dad stood buck naked in the doorway. They laughed and said that I had just fucked the prettiest lady there. My math teacher spoke my parents.. Grinning she ask a question: you did teach this young man that what happens at the ranch stay at the ranch...I don't want the nosy board members finding out about this. I kissed her on the left nipple and then on the lips and said my lips are sealed....and I want a repeat performance at the next party. She agreed.

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