It was shortly after eleven and there was school the next day so they hurried to their grandma's house – where their father had taken them earlier that evening. Their grandma had given birth to their father quite late in life, he was thirty-seven and she was in her seventies.

She was active enough to live alone, and had been doing so since becoming a widow about ten years before. She stayed home most of the time, watching television from early morning until late at night, and Rod and Betty had no trouble slipping in and out of the big two-story house after telling her good night and going upstairs to the rooms assigned to them.

They'd managed to get a key nobody knew they had and they thought it a great joke on their hypocritical parents that the two bedrooms had an adjoining bath. They never actually slept together, as there was always the chance that their kindly grandmother would come upstairs to check on them, but they were always glad when their mother and father had a swapping party. That meant they'd have a good chance to see some erotic sights – they had failed to find a spot from which to peek a few times – and they could also have the sex they enjoyed so much without worrying all that much about being caught.

They only had to walk about a mile, and there was only one thing that caused then to have to exercise a certain amount of caution on the way. They weren't afraid of prowlers, but they were afraid of being mistaken for prowlers by the residents and by the police.

It was an upper middle-class residential neighborhood and police patrol cars patrolled the area regularly. There were plenty of trees to duck behind, however, and they'd never been spotted by the police or questioned, and as far as they knew had never been reported by nervous homeowners.

They made it to their grandma's without mishap, and then into the house and up the stairs. The nice old lady was still watching television. Rod wondered, as he often had, what she'd say if she knew what kind of a family her son had. But then he thought she might've been a swinger or a swapper in her day, too. She was still a nice-looking woman and he'd seen pictures that proved she'd been a well-stacked beauty in her younger days.