Bob started jerking off again.

But stroking his young thigh only made Susan's cunt throb all the more. With her eyes hot on his, she widened her smile and moved her hand higher on his thigh. Bob groaned softly, scooting his ass forward on the bench. Susan felt the leg of his trunks and dragged a fingertip along it. Now she could feel movement, and she let out a soft whimper. If she was ever going to grab her son's cock, she told herself, now was the time.

Sliding her fingers underneath the leg of his trunks, she watched Bob's eyes turn glassy. The tips of her fingers touched his balls, and Bob grunted.

"Baby," Susan whispered very softly. "Oh, Bobby!"

She gripped his balls, pressing her thigh against his. She pulled her hand from his trunks and slipped it over his fist. She squeezed his fist hard about his cock, then shoved his hand away. Closing her fingers around his cock, she gasped with excitement. His prick throbbed so hotly in her fist and was so beautifully hard. Bob gazed at her as she squeezed his cock and started pumping up and down.

"Shhh," she said, nodding her head toward his brother and sister. "Be very quiet, baby."

Bob lifted his hips, trying to fuck his mother's fist. But Susan started jacking him faster, and all he could do was lean on the deck, holding his hips up as she jacked faster with a tight fist. He began to breathe with short, gasping sounds, still staring into his mother's strangely hotlooking eyes.

Susan's cunt throbbed painfully, her clit so swollen she wondered why it didn't burst through the crotch of her bikini. She was certain, that if she stood up, her clit would be closed her fist tight on her son's cock, squeezing as she jerked up and down. She released his cock for just a brief moment, sliding her hand into his trunks and squeezing his full balls, then gripped his hard cock again, pounding up and down swiftly and tightly. Bob began to make strangling sounds, his hips twisting now. His cock seemed to become larger, longer, and harder. Knowing he was about to come, Susan beat at his cock almost in a frenzy.