Robin was about to announce her presence, when she saw Charlie Crawford's pants drop to his ankles, revealing his cock.

"God, Charlie," she heard her mother gasp. "That's a beautiful, big cock."

Robin stared in disbelief as she watched her mother sliding his velvety foreskin up and down over his cockhead. It was too late now to announce her presence, so Robin remained perfectly still, her heart pounding in her throat.

She watched Charlie reach under her mother's short dress, cupping the soft white cheeks of her ass in his big hands. His fingers slipped under her flimsy bikini panties, and probed the soft, warm crevice between her ass-cheeks. Her skirt raised high, he pulled her closer to him, rolling his hard cock back and forth against her bare belly.

"Could it be tomorrow?" she heard her mother whisper. "Can we spend tomorrow together in a motel?"

"Yes," he gasped, his finger working in and out of the deep crevice. "I'll call you in the morning."

"Oh, God," her mother sobbed, "I need a good fucking so bad."

"Don't worry," he smiled. "I promise you the best fuckin' time you've ever had."

"Oh, Charlie," she whispered. "You can't imagine what a lousy lay my poor, sweet husband is. I really need a good fucking."

Robin couldn't believe what she was hearing and seeing. She had always thought her mother and step-father had a good marriage. Not only was her mother unfaithful, but she was telling a neighbor about Bob's lousy sex performance. At that moment, she felt nothing but hate for her mother.

When Charlie released her, Diane dropped to her knees, eagerly grasping his hard shaft in her hands. Smiling up at him, she began gently sliding his cock's skin back and forth.

Robin almost shit her pants when she saw her mother lean forward and lightly lick the end of his prick.