Do you masturbate to your own stepmother? Why is your dick so big?

A stepson shares a bed with his stepmother. Her satin robe drapes so seductively across her wide hips that he can't control himself. He begins to stare at her hot body and masturbate. She notices this and is indignant. But his dick is so big that she decides to try it on him. She allows him to fuck her right there in bed without a condom.