(See, Step-Stories: Happy Birthday, Parts 1 and 2)
She observed her husband and stepson in the water, dunking each other and generally rough housing as boys do. After a few minutes, they calmed down and began tossing a small football across the length of the pool. She loved watching them together, doing those regular father-son things she knew her husband had dreamed of when her stepson was just a boy.
"Just a boy," she thought to herself. "Not anymore. I can't believe how hot he's gotten."
The last time she saw her stepson, he was sixteen and just starting to fill out. Still an awkward adolescent, he had been more interested in video games than spending time with his new stepmother. It wasn't that he resented her presence. In fact, he was happy to know that his father had a companion again and it was easy to see how much they cared for each other. He had just started noticing girls, though, and was disconcerted by the constant erections he would get in her presence. He felt guilty about getting turned on by his stepmother and spent most of his time hiding from her in his room or in the shower, jerking off.
Now, however, he was an eighteen year old stud: football star, junior fireman, and starting at the academy in a few months to become a naval aviator. She knew he had become sexually active, his mother had found an empty condom wrapper in the washing machine last year and called her husband to give them a heads up, and it was easy to see why. His 6'3" frame, dark blond hair, and green eyes were enough to make any girl wet her panties, but he topped it all off with a perfectly cut physique, maintained by his rigorous routine of running, weight lifting, and sports. The fact that he was here, half naked in her pool, was just a bonus.
She squeezed her legs together again and glanced down at her erect nipples. Her husband had taken such good care of her that morning, bringing her to orgasm twice before breakfast, but she was getting wound up again. She smiled as she remembered the article about a woman's sex drive peaking in her thirties. The only problem, of course, being that the same study stated that a man peaked at eighteen, which made complete satisfaction slightly more elusive. Her husband certainly knew how to fuck her but she was ready to go again in just a few hours, while he needed 24 to 36 hours to recharge his batteries. As a result, she spent more time masturbating now that she ever had when she was in college and had first discovered porn.
She refocused on the pool, watching the water churn her stepson dove to catch a throw from his father. He came up quickly, one hand on the football and the other reaching up to push his hair from his eyes. As he was retracting an arm to return fire, the sun caught the water on his muscled chest just right and the sparkle made his stepmother gasp. The sound was enough to break his concentration and, as his eyes flicked toward her, the ball flew from his hand, arching over his father's head and into the tropical shrubs that surrounded the pool.
"Really, son?" his father shouted with a laugh. "Brought down by a pair of tits? Aren't you used to playing in front of cheerleaders?"
He blushed and began paddling to the side of the pool to retrieve the ball. "Well, I can't usually see their nipples during the game."
Now, it was his stepmother's turn to laugh. "Sorry, buddy. I'll cover up."
"No, no," replied his father. "Leave them out. He needs to appreciate the presence of a beautiful woman instead of those little skirts he's been chasing."
His son hoisted himself from the water in front of her and she bit her lip at the sight of his arms. He gave her a little smile and flicked chilly droplets on her as he strode over to the bushes. When he turned, however, her mouth fell open at the sight of the tent in his swimsuit. At her gaze, he glanced down and, seeing what had attracted her attention, held the football in front of his crotch and ran back to the water. The splash of his re-entry caught her and she squealed.
"Get in here, gorgeous," called her husband. "I could use you on my team!"
