I thought I was alone in the house, but as I whipped out my throbbing cock for a quick release, I heard footsteps. My stepsister, wearing a revealing top and short skirt, walked in, catching me mid-stroke. Her eyes widened, but she didn't leave. Instead, she bit her lip, watching my thick cock pulse in my hand. I couldn't help but stroke it harder, my pre-cum leaking out. She approached, her tits almost spilling out, and took over, giving me the best titty fuck of my life.