The family of four (husband & wife: Tom and Alice, kids: Maggie-19 and Mark-18) were 2 weeks into a month long vacation at a cabin by a lake. Husband and wife still had not had sex with each other for over 10 years. Their daughter Maggie and her first real boyfriend (Randy) had recently broken up. Randy had taken her virginity a year earlier and after experiencing sex for the first time, she was hooked. She loved sex. Mark, their son was in a long-term relationship with Tammy (an older woman). Tammy had convinced Mark that they should enjoy an open relationship.

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After repeatedly being tempted to fuck his...