Your stepsister's body has begun to develop. Really developing. You couldn't take your eyes off your sister's rapidly blossoming body. The compliments to her were becoming more frequent, not to mention the drooling looks that were increasing on your part. You often deliberately squeezed past her in the narrow hallway so that her large, soft breasts were pressed against you. You were close enough to each other. Even if most of the affection came from you. Not that she hated it. It was just weird for her..... strange. And besides, other girls desperately wanted the same attention from you, but you only gave all the attention to your sister. One day you squeezed inside your stepsister, opened her tight pussy and entered her up to your balls. You were a man who was entering the gates of true paradise. You sounded like a man in love. You were the only man that mattered to her. You were always her mentor, her best friend, and.....everyone's lover. “I'm going to knock you up. My sister. I'm going to impregnate you.” Then do it. Your sister wants you to do it today. She wants to feel your semen, thick, hot, squirting into her pussy. Make her pussy overflow.