Just as she got settled, she heard them coming in the front door. They peeked into the living room, and Mrs. Nelson said, "Thank God."

"Yeah," Mr. Nelson chuckled, "I'm so horny, I was hoping I wouldn't have to drive her home!"

Horny! Tracy had been hearing that word a lot lately. When Freddie tried to go too far with her, he said be was horny as if that excused everything. Once Margie complained that she was horny, and Tracy asked what that meant. Margie said it meant wanting to fuck. Again the words wasn't much help to Tracy. Now Mr. Nelson was saying he was horny. Did that mean he was going to fuck Mrs. Nelson?

She sat belt upright. FUCK – that was the big word at school, the one she really wanted to know about. And here was her chance to find out what it meant. The Nelsons had already gone to their bedroom down the hall, but she could see that they'd left the door partially open. They always did that, in case one of the kids started crying. Quivering with curiosity, Tracy rolled off the couch and started creeping down the hall.

She could hear the Nelsons talking quietly together, and Mrs. Nelson kept giggling. The hall was dark, concealing Tracy in its shadows as she reached the bedroom door. In the Nelsons' room only a dim bedside lamp was on. She could stand right in the doorway and see everything. She was so excited she was panting softly.

The Nelsons were undressing. They were a very attractive young couple in their late twenties. Amy Nelson was a tall slender blonde with the grace and poise of a fashion model. Jim Nelson was tall, lanky, lean and dark-haired. Tracy had always thought he was terrifically sexy, even when she didn't quite understand what that word meant. It was just that her pussy got wet whenever he grinned at her.

Now she lasted her eyes as the couple stripped. Amy was already down to her bra and panties, while Jim fumbled with a stubborn shoelace. Amy unhooked her bra and let it fail to the floor. She had luscious high-riding tits the size of apples, and they were capped with little pointed red nipples. The perfect pale globes quivered slightly with her movements, and Jim eyed them hungrily.