Seconds later I followed, my heart pulsing in my ears. I walked ten paces behind my sister, watching her hips tilt side to side as she hurried away. She looked back to make sure I was following and then entered a small, family restroom. When I opened the door, she attacked me, pulling me in and locking the door. Gianna pressed her body against mine, stroking my erection through my slacks. "How did you do this to me?" she pleaded desperately. "Why did you make me like this?"

"You do it to me too, baby. You belong to me and I belong to you." I cupped her between the legs,...