I discovered my stepsister having virtual sex with her boyfriend and threatened to inform our mother unless she had sex with him.

I stumbled upon my stepsister and her boyfriend indulging in some virtual pleasure. I found it rather amusing, but also saw an opportunity to spice things up. I decided to confront her, telling her that I knew what was going on. I gave her an ultimatum - she had to give her boyfriend a real treat or else I'd spill the beans to our mother. Being the obedient girl she is, she agreed to my terms. I told her to get ready and soon enough, she was on the bed, naked and waiting for her man. Her big, beautiful tits were bouncing as she rode him, her mature body moving in rhythm with his. The sight of her big ass bouncing up and down was enough to make anyone lose control. It was a sight to behold, a perfect blend of beauty and lust. In the end, she was rewarded with a hot session of sex, all thanks to me.