My father was a notorious sex educator. He taught sex ed at my high school, and was know as "The Hard 'Pard". We live in Texas, in case your wondering. I would often stumble across catches of his material. Let me tell you, that was usually some pretty explicit stuff.
Now let me tell you that in my family, masturbation was, shall we say, hell. I was watching one of the videos in my room on day when my father walked in. Luckily, my mom and 18-year old sister, Katie (the same age as I), were out shopping. I had to first endure the agonizing silence as my father gaped at me with my stiff rod in hand. Then I had to endure a half-hour lecture from him. I never whacked off when he was home again.
Then one day I found a video that I hadn't see before. It didn't have any labels, but I put it in the VCR anyway. What I saw made my gag. It was a videotape of my parents! I sat, memorized, while I watched my dad fuck my mom doggy style. Then he flipped her over, and ate her out. I could feel my balls begin to tingle, and I reached for my cock. Then I heard a knock on my door. "What is it?" I asked through the door as I pulled up my pants and muted the volume on the movie. "What are you watching?" I heard my sister ask. Damnit, my sister! "Uh, nothing Katie, nothing at all!" I responded. "Yeah right! I heard something coming from that room and I'm curious. I want in!" she said. "No!" I yelled, throwing my hands up.
Big mistake. The door flew open, and my sister flew in. She ran over to the VCR, and looked at the screen. Her mouth hung open. "Jesus, that's mom! And there's dad! Brad, were you taping them?!" Katie demanded. "No! I found it in dad's movie stash!" I defended, grabbing her around the waist, and picking her up. "Holy shit, your hard as hell!" she yelled. Luckily, our parents we not home. They were at a meeting. If they heard this repertoire, they would most likely kick us out of the house. "So what? Your in my room!" I said. Suddenly, she shifted her weight, and my right hand slipped to her crotch. She was wearing a skirt, and my hand went right under it. She was dripping! "Holy shit!" I yelled, and dropped her. "So what? Your hand was on me," Katie said.
My cock was raging. I uneasily helped her up, then went over and closed my door, then my windows, along with the shades. "What do you want to do about it? I was on you, you were in my room. What's the part that we can agree upon?" I asked.