Her parents were divorced and living with her mom was stifling her. She wanted to live with her dad. She was just sixteen, though, so it looked like she would would have to endure two more long years before she could investigate things sexual. On a rare weekend visit with her father she asked him to take her on her first romantic date. In determining what "romantic" meant some investigation revealed she did not object to being naked with him. She didn't object to letting him breed her, either.
His daughters had escaped with a pack of grass when a party they were at was raided. To protect his daughters he had to help them dispose of the evidence ... he did't expect what that would result in!
It was a silly, sexy idea, made to Nancy by an author she'd been chatting with on SOL. She'd confessed that she found some of her son and daughter's friends attractive, and he'd suggested that, next time they were over, she should go 'sans panties'. What harm could it do?