A brother and sister grow up best friends as USMC officer's children, fall in love, get married, and have a family. All this time they are being taught how to become spies for their country.
When a noise wakes him at 2am he goes to investigate only to find his mother's boyfriend passed out on the living room floor and his mother feeling very merry indeed!
Allie can't have any more babies, even though she and husband John would like another. In a moment of delight as he fills her pussy, she has the idea of getting her son to fuck her eldest daughter pregnant. Perhaps, she reasons, if she were to get him addicted to bareback sex and then somehow contrived to get him up close and personal with Danni, maybe nature would take its course? There's another member of the family, Rachel, who hasn't yet reached menarche, as far as anyone knows...
Lauren is shocked to discover her son, Nico, overhears her brief indiscretion with the college friend he brought home for a visit. But her shock becomes something else entirely when Nico decides to make her his own.