Older sister seduces her younger brother. They begin making love often and thought that she was protected by an IUD. She missed two periods and began having morning sickness. Her OBGYN told her she was pregnant.
Donald was confused, his sister had a letter from school informing his mother that he had failed a subject. A subject from last semester in which he scored an 'A'.
Jill comes home to find her brother and her cousins having sex. When sneaking into her room she discovers their parent having swinging sex and acting out fantasies. She plans a birthday party for her dad where he takes her virginity thinking she is someone else.