"I like it, Mom," Billy said, his voice strangely like a grown man's.

"But you mustn't," she replied, wondering why she couldn't move her hands, move them to cover her tits and cunt. She trembled, acutely aware that her cunt was swelling, pulsating, getting very, very wet.

"Do you play with it, Mom?" Billy asked.

"Billy!"

"Well, do you?"

For what seemed an eternity, they stared at one another. Then, to her horror, Joan found her hand moving, but not to conceal her cunt. Her fingers brushed through the thick hair of her pussy, her eyes fixed hotly on the bulge of her son's cock. She parted the hair of her pussy with two fingers, then flushed when a finger started rubbing lightly at her throbbing clit. She couldn't stop it, as if something had taken control of her body, her hand. Her feet parted, hips jutting forward lewdly.

"Mom, will you let me fuck you?" Billy asked bluntly.

"Let you… what?" "Fuck you, Mom."

Joan lost her voice for a moment.

Billy didn't want to tell her where he got the idea, or how. His mother might mention it to Doctor Nancy, and Doctor Nancy had promised he could fuck her next time, but only if he peeked at his mother and told what she did with herself. In his young mind, he felt the doctor would be excited if he could say he had fucked his mother.

"My cock hurts, Mom," Billy said truthfully. His cock was confined inside his pants, very hard.

"Take it out, then," Joan heard herself whispering, sliding her middle finger up and down the side of her swollen clit.

But he didn't take his cock out.

He lowered his pants and shorts to his knees. Joan swallowed with nervous excitement as she stared at his cock. Such a young prick, yet so big, she thought to herself as a tremor swept about her flesh. So young he didn't have any hair at the base of his prick. His balls dangled downward, yet looked full.