Having heard sounds of distress coming from our bathroom, I went inside to check out what was going on. Upon opening the door, I caught my stepsister Anna literally freaking out with a pregnancy test in her hand. She showed it to me, and, sure enough, it was positive. When she actually realized that there was a chance I might tell this to her step mother and my step dad, she started begging me to keep it a secret. As she was sitting on her toilet, I had the perfect view inside of her revealing shirt and was able to see most of her round tits, which made me horny as hell. I do not have to tell you how much I wanted to fuck her ever since I laid my eyes on her for the first time. And here was the perfect opportunity for that. I mean, what could happen? She definitely cannot get pregnant again! So, I told her that I would keep silent if she let me bang her.