I found out a secret about my stepsister. I was surfing through some of my favorite porn tube sites the other day when I stumbled upon a video that starred a big-breasted blonde chick that looked a lot like my older step-sister. As soon as I started watching it, and heard her voice, I knew beyond a shadow of a doubt that my step-sister was making porn! I felt guilty for watching it, but I couldn’t stop. My eyes were glued to the screen as I watched her take a huge cock, and loving it! I stroked myself off to the hugest orgasm I had ever had, imagining that the girl who was in the room right next to me was a huge cock slut and now I had to keep it to myself that I knew her secret. I was looking at some pictures of her the other day from some porn site, and stroking my dick while laying in bed, when suddenly the door opened and it was my big step-sis! She caught me jacking off, and even wors… to her porn!