It was just me, my sister, and our father living together. My mother had passed away, leaving my dad to raise two kids on his own. Right around the time I decided to go to college, he dropped a shocking revelation on me—my sister and I weren't biologically related. From that day on, I couldn't act around her the same way anymore. Seeing my awkwardness, my sister started teasing me playfully, enjoying my discomfort. With her model-like figure, my stepsister's seduction slowly turned my sexual switch completely ON. Her jiggling big tits and round ass left no room for rational thought. Overwhelmed by her intense sexuality, my self-control was rapidly reaching its limit...