With a total lack of embarrassment, Billy said: "I been watching Bob fuck you, Mother."

The blush on Susan's face deepened, and she lowered her eyes. This is silly, she told herself frantically. I saw him fucking Pamie, didn't I? This is what I've been wanting, isn't it?

She lifted her eyes, stopping when they saw his cock outlined in his pants. "Where is your sister?"

"Changing into her bikini," Billy said.

He looked boldly into his mother's face. Susan lifted her eyes to his briefly, but dropped them back to his cock. She uncrossed her arms, lifting her shoulders out of the water. Billy's eyes followed and gazed at his mother's tits. Bob was on the other side of the tub, watching. Susan ran her hand up Billy's leg, wetting his pants. She placed her hand on his cock, pressing.

"Take it out, Billy," she whispered in a throaty voice. "Take your cock out for me."

Billy dropped his school books, his fingers working at his fly eagerly. He reached in and and pulled his cock out. It was not as large as Bob's, but very long. Susan gazed with smoldering eyes, then wrapped her fist about it and started pumping back and forth.

Bob came to stand on the bench next to her, feeling of her cunt from behind. Susan arched her ass back, turning her face to him, kissing Bob as she jacked on Billy's cock.

"Can I take my clothes off, Mother?" Billy asked, his voice eager.

"You bet you can, darling," she said.

She released his cock as he undressed, but stood on her knees watching him, letting Bob finger fuck her. She felt his cock pressing at her hips, aud jerked his prick beneath the water.

Naked, Billy looked beautiful to her. His balls had hardly any hair, and neither did the base of his cock. His prick lurched up and down as he slipped into the water. Leaving Bob alone, Susan stood before Billy as he settled on the bench. She dipped her hand down and grasped his throbbing cock, spreading her knees along his thighs.