Without wondering, trying to blot it from her mind, she pretended she was someone else, not Billy's mother. She moved toward the door. The gown clung to her hips, falling just beneath the curve of her ass, her long legs glowing, tits revealed through the filmy garment. She entered the hall and turned toward her son's room.

Trying to keep the thought that she was his mother out of her mind, she shoved his door open, silently. Billy lay on his bed, pulling at his cock. She smiled to herself as she gazed at his cock and balls.

"Billy?" she whispered.

He turned and opened his eyes, looking at his mother. He started to grin, but saw the expression on her face. There was something there that made him stop grinning. If he grinned, he felt his mother would leave, ashamed. Joan stepped into his room, her eyes on his upstanding cock. Billy saw his mother's tits through the filmy gown, the narrow waist, the flare of her hips and the long, long legs. The shadow of her dark cunt hair could be seen. His cock throb, bed, bubbling with moisture at the piss hole.

Joan sat on the edge of his bed, and her hand slipped along his warm thigh, moving to his throbbing hard-on. She wasn't breathing, but when her fingers touched his balls, a loud hiss came from her.

"Ohhhh, God!" Joan gasped, and she gripped her son's cock with a tight fist. "Oh, Billy, I… oh, I need this so much!"

She squeezed his cock, making him groan. With quick movements, Joan climbed onto her son's bed, straddling him with her knees. She held his cock at the base, lifting her gown to her waist. Billy gazed down at her, watching her hairy cunt rubbing along the head of his prick. Joan stared into his face, excited by his hot eyes on her cunt. She lowered her hips, fucking the head of his cock into her cunt.

"Oooooo, Billy!" she sighed, settling down on his prick, the hairy lips of her cunt tight at the base. "I want it so much!"