Stepbrother joins step sister in watching porn and ends up having sex with her

My step sister and I were chilling in the living room, scrolling through our social media feeds when she stumbled upon a video of a guy with a massive black cock. She was totally enthralled by it and couldn't help but moan in ecstasy as she watched it. I couldn't resist joining in on the fun, so I sat right beside her. As we both continued to watch the video, my step sister began to get more and more aroused. She unzipped my pants and started stroking my hard cock. I couldn't believe what I was seeing! The sight of her getting off on that monster cock was too much for me to handle, and I knew I had to take her right then and there. I lifted her up and pushed her against the wall, spreading her legs wide open to give me full access to her.