"Twice a day," she asked, her voice at throaty whisper. "Three times a day, maybe?"

Bobby lowered his book, looking at his mother. He saw her knee, and watched with interest while her skirt slipped another inch along her thigh.

"Sometimes four," he said, his own voice suddenly thick.

"Four? That many?" Sharon asked, feeling the heat starting on her lovely face. "I didn't know you did it that often."

"I do," he replied.

"The girl…" Sharon murmured, knowing he was gazing boldly at her exposed knee. "The one that dropped her books at the mall. She was very pretty, wasn't she?"

Bobby nodded.

"You saw… everything, didn't you?"

"Pretty ass," Bobby said bluntly.

Sharon felt a catch in her chest. Her face burned with shyness, but her cunt was boiling. She swung her foot faster and faster.

"Yes, she… it was nice," she agreed, her voice hoarse.

"She probably does it, Mom," Bobby said, his cock swelling inside his pants. "She probably does it all the time."

"You'd love to do it with her, wouldn't you?"

Bobby swallowed, nodding his head. His mother's skirt was past her knees quite a ways now, almost half her thigh showing. He had never known his mother to allow so much skin to show, and he was quite interested in how much more she would let him see before pulling the skirt down.

"Did you think about doing it to her when you… when you were in the bathroom?" Sharon asked, feeling the heat of her blush scalding now. She was embarrassed to even talk this way, but something was pushing her, forcing her to keep on.