The next day, Zane made good on his promise. Our parents were home, laughing and chatting in the living room while watching a movie. The risk should have terrified me. Instead, my pussy was throbbing with shameful excitement as I helped Mom in the kitchen, wearing a short sundress with nothing underneath, just like Zane had ordered through text.

I was bending over to put dishes in the dishwasher when I felt him behind me. Strong hands gripped my hips hard. Zane pressed his massive bulge against my ass, grinding slowly while our parents were just one room away.

"Such a good little stepsister," he whispered darkly in my ear,...