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.
A habitually cheating mother is caught cheating again, this time by her high-school-age son. In order to protect her second marriage from ending in divorce too, he punishes her to teach her a lesson. Then he takes over keeping her in line... his way!
A Halloween fling with a hostess dressed as a she-devil leads to even more pleasures for an unhappily married businessman. Surprises might yet await them all.
A family boating on vacation near a Virginia barrier island on the 4th of July are the victims of an unusual biological attack, with very deviant consequences. The last third of the story is resolution; all the sex is in the first two thirds. The coercion is biological, and reluctance or regret is brief.