Lonnie Bertin undressed and slipped on swimming trunks. His bathing suit fit snugly around his hips, buttocks and crotch. The cloth material pressed upon his cock and balls, and he felt his prick stirring and growing stiff. It strained upon the bathing suit. He now had a full-fledged hard-on. But then it seemed he always had a hard-on. His dick seemed to stay in a constant state of stiffness.

Lonnie had recently undergone puberty, and his balls and cock tingled constantly, and his thoughts dwelt almost entirely on his hard throbbing straining prick. He stayed in a state of arousal.

He stroked his dick and masturbated a lot, but no matter how often he beat his meat it seemed to be ready to spring up at a moment's notice. Especially when he thought about or saw his mom.

Lonnie's mother was a film actress, attractive, and divorced. Summer had arrived, Lonnie was out of school and his mother was between films, so they spent most of their time together in the house.

He thought about his mother a lot. She was so sexy, such a fox; and she was so casual and uninhibited around the house. She was somewhat flirty and free, occasionally kissing Lonnie on the cheek and touching his shoulders and arms. She tended to dress scantily, wearing a short silky robe or shorts. And she usually kept her bedroom door open. Lonnie had seen her in various stages of undress; once, he'd seen her naked. He had passed by her bedroom and she had been changing clothes. She was stark naked. But she hadn't acted embarrassed when he saw her. She had simply smiled at him and proceeded to dress.

Lonnie's mother knew he was "at that age." She had seen him occasionally rubbing his crotch, and had twice seen him masturbating. Once, she had passed his bedroom door and had seen him lying on the bed, on top of a pillow, pumping away at it. Lonnie had looked up and seen his mother, and knew that she had seen him pumping the pillow. And once, she had opened the bathroom door and there was Lonnie standing by the commode, jacking his dick, rubbing it fast and hard. Again, Lonnie knew that she had seen him. But she hadn't said anything about it, so he had grown quite bold. He now masturbated openly in the bathroom and his bedroom.

Lonnie walked through the house to the rear and stepped out onto the patio. He saw his mother standing by the diving board of the swimming pool. She wore a black bikini.

Valerie Bertin was in her prime, and despite having a thirteen-year-old son was quite attractive with a pretty face and a nice body. Her ebony hair fell in full shimmering waves past her shoulders, her eyes were big and deep brown, and her skin was peachy tanned. The bikini she wore served only to cover the "bare necessities." Half her breasts, most of her rump, and all of her legs were exposed.

Lonnie watched as she stepped onto the diving board. God, she is so sexy! He thought. He felt his dick start to grow and stiffen. She stood for a few seconds on the board and then dived into the pool. Lonnie's cock stood at attention. It throbbed and ached.

She saw him standing by the pool and called out: "Come on in, the water's fine!"

Lonnie jumped in and swam toward his mother. She smiled and swam away with Lonnie in pursuit. They began playing in the water, splashing each other and playing tag. He caught her from behind and she laughed and splashed and squirmed to break away. Her rear end brushed upon his crotch and he gasped with the sensation. She was still squirming around and trying to break free, and once again her rump swept across his groin. With a groan, he pressed his crotch forward. He hissed when his prick made contact with her butt. It was as if his dick had a mind of its own. It took over completely.

He wrapped his arms around her waist and began humping her rump, pumping his hard throbbing cock on her ass. Nothing could have stopped him; he was beyond control.

"Oh, ah, unh, oh Mom!" he panted as he hunched her.

"Oh Lonnie, oh baby," his mother said softly. She halfheartedly made as if to break away. He kept pumping her rump with his rock-hard prick. "Oh Mom, oh, I can't stop—oh, it feels too good to stop."

He heaved his crotch forward, mashing and grinding it upon her rear end. "Unh—ahh—now!" he cried out as cum erupted from his dick. He huffed and panted and hunched with unbridled lust as the hot creamy juice kept spewing out.

After he had emptied his balls and shot his load, Lonnie was embarrassed. He couldn't bear to face his mother. She gently placed a hand on his cheek. "Oh honey," she said softly, "it's all right." She kissed his cheek and smiled. "Don't worry about it."

That evening Lonnie lay on his bed in his pajamas, doing what he usually did—stroking his cock. He thought about his mother, and his prick stiffened and balls tingled. He briskly rubbed his dick and shivered at the sensation. His cock was now hard and full and throbbing...

Lonnie's mother sprawled on her bed in a negligee watching TV. The thought of Lonnie and what had happened in the pool came to her and she smiled softly and wryly. Ah, he couldn't help it, she thought. He's at that age--his hormones are running wild. He certainly has gone through some changes over the past few months. He's grown—he's big for his age—he's turned into a good-looking guy too.

She smiled wryly again as she thought of what had happened in the pool. He was so horny, she thought, so hard, and he kept—rubbing me, kept hunching me.

She felt a warm fizzy tingling ripple up and down her body as she thought of her son pumping his hard prick on her rump. His cock was so hard, she thought, and it's—it's good-sized—I could feel it was—it's thick and hard.

Her breasts and ass were tingling; her pussy was throbbing. She placed one hand on a breast and slowly stroked it and ran another hand down between her legs and softly rubbed her yoni...