Chapter 1

It was just past two o'clock, on a hot summer afternoon, as Mark pulled himself up out of the water and onto the deck of the swimming pool. The pool water had felt refreshing after the job of mowing the lawn was over and Mark figured it was a good time to get a little bit of sun. The boy stood up on the deck and allowed the water to drip on off of him, then grabbed a towel and dried himself off as best he could. His shorts were still wet, and they clung to him tightly. That didn't bother him; actually it felt kind of good. He lay the seat back of the lounge chair about midway before sinking into it; his feet up, the sun feeling nice and warm on his chest.

As Mark soaked in the suns warm rays and relaxed, his thoughts drifted back to those of the previous night; with his girlfriend Karen. Mark and Karen had been dating since the spring; just before the end of school, and Mark had looked forward to the summer, hoping that their relationship would move into new areas. She was a very pretty young girl; slender and petite but also athletic, a long blonde beauty with a body to match. Unfortunately, Karen was being raised in a rather conservative home and was reluctant to follow nature's adolescent callings so easily. The two had found themselves alone at Karen's house, and while making out on her couch, had gone further than ever before. She had not only let him slide his hand up her blouse, but she had not been wearing a bra; he had felt her bare, firm tits for the first time. It made him so hard, he felt like his dick was about to break. But Karen would go no further than that, insisting that her parents would be home at any second, and ended the evening. Mark left for home, frustrated and sore. He had been close enough to his dreams, and he craved inside for Karen to open up and let him have his way with her. However, Mark was sure it was simply because she was scared, so far she had not even touched his cock; not even through his pants. After returning home, and in bed that night, Mark had reached down to to relieve his adolescent stress. He stroked himself, slowly at first, building to a climax, finally spewing his cum all over his stomach and hand. Still not satisfied, he had kept playing with himself, rubbing his cum over his cock before getting hard again and furiously jerking off one more time. At least it calmed him down enough so he could get to sleep. Surely the time would come soon when Karen would give him everything he wanted. He desperately wanted her; just to stroke his cock, maybe even put her mouth on it, to feel what it would be like to put it inside of her, to fuck her. But for now, all he had was his own hand.

Mark was a good looking boy, newly turned 16, his hair dark brown, big brown eyes and a tan that got the attention of a lot of girls. At only 5'6", he was slender, yet with just a touch of muscle beginning to break through, making him look very attractive anytime his shirt was off. Some girls said his facial features were "cute," while others described him as downright "handsome." Since he had been going with Karen, he had wondered several times over the past three months if he hadn't cost himself the chance to lose his virginity with another girl. So far, he had been faithful to her, but he didn't know how much longer he would last, unless she started giving him the sex he craved.

As he lay there in the sun, thinking about the night before, he began to get an erection. "God, her tits had felt so good, and so firm!" His mind recapturing the moment. The more he thought, the more his cock reacted and, unconsciously, the handsome teenager reached down and began to stroke his cock through his slowly drying shorts. "Mmmmmm..." He softly moaned.

He gazed over at the sliding glass door and windows of the house, and then around the large privacy fence which encircled the pool area and pondered; his Mother and Father were off at work, they wouldn't be back for hours; his little sister, Sara, was god-knows-where and most likely wouldn't return until shortly before their parents did. He was alone and could do as he pleased.

Mark considered getting up and going to his bedroom, but he was so comfortable sitting in the sun, in the lounge chair, feeling the warmth on his skin, and with the thought of doing it out in the open exciting him even more, and he stayed right where he was. He let his hands slide to the waistband of his shorts, and hooking it with his fingers and lifting up his hips, sliding the suit down to his knees and let his now hard cock spring free. He lay there silently, looking at his penis standing up off of his hips, and enjoyed the sensation of the wind as it blew a cool breeze on it. His dick was of average size, six inches long or so; but longer than other guys his age (at least he thought, having never seen anyone else with an erection), and it made him feel mature; looking at his erection. As he lay there looking at it, he began to fantasize sliding it in and out of Karen's lips or of her straddling him right there and then and of penetrating into her. His thoughts of her made him even hotter and, looking around once again, Mark reached down to slide the bathing suit all the way off, laying it beside him on the deck. It was a new sensation for him; being nude, outside, and it was a real turn on for the youngster.

Feeling he had plenty of time, he curiously allowed one hand to slide to his nipple and caress it. Mark began to realize why Karen liked that so much, feeling the sensation when he did it to himself. As he caressed the nipples on his hard chest, his other hand slid down to gently cradle his balls with his fingertips. Mark moaned softly at the feeling, catching himself and worrying that he might have groaned too loudly. He caressed himself in self foreplay, letting the feelings build and build within him; getting hotter and hotter, touching himself, thinking of Karen, wanting to fuck her, wanting to fuck her mouth and wanting to cum in her.

Gently, he moved his hand to grasp his rock hard cock and began stroking it, slowly at first, then a little faster. It felt too good and although he knew that he didn't want to come just yet, he wouldn't be able to hold it back much longer. With one hand playing with his balls, his other began moving faster and faster, up and down his hard cock; pumping it, making it feel so good, he was quickly reaching an orgasm.

His scrotum began to tighten and pull tight to his groin, becoming incredibly tense and sensitive, and his cock began to swell and stiffen to its limits. He could feel an almost boiling sensation in his balls and he groaned aloud as he began to reach his orgasm. His fist was nearly a blur on his cock as he jerked himself off, urging the sensation on; faster and faster. His spurting young cock blasted it's release high onto his chest; then again, lower onto his belly. He continued to pump from deep inside until the final spurts dribbled down his hand and slowly over his pulsing erection.

Mark finally relaxed his body, still holding his cock, slowly caressing and milking it in his hand.

"Wow..." Mark heard the faint, almost breathless sound come from the shade under the patio awning.

Without having to look, he immediately recognized the sound as that of his little step-sisters voice. Without a thought, his head turned quickly to the sound, the rest of his body frozen, to see her standing in the opened sliding glass door; in her swim suit, a towel in her hand. He lay there unable to move; nude, his cock in his hand, his belly and chest covered with his cum.

"Uh... Sara... uh... ummm..." he stammered; still not moving, still holding his cock and looking with worry at his little sister.

For a moment, he just lay there, speechless, hoping she would turn and run, not knowing or understanding what he'd been doing. But she didn't. She just stood there, staring at him. Then he noticed that her eyes, wide when he first saw her, now seemed filled with curiosity and awe. She was looking at her 16-year-old brother's nude body and apparently, enjoying what she saw. Without saying a word, she began to walk over to him slowly.

"Sara!?!" He called out at her, surprised at her reactions.

"It's ok, Mark. I know guys do that. We read about it in sex-ed class. You know, wet dreams and all that stuff." She said to him as she stepped closer.

Mark was stumped, completely at a loss for words. But it was more than what she'd said, it was the look in her eyes as she'd said it. It was almost matter-of-fact, or as if she wasn't really talking to Mark but to herself, and he noticed that her gaze was clearly fixed on his crotch as she neared.

It was as Sara stepped out from the shade and into the sunlight that Mark noticed a difference in Sara. He has recognized for some time now that she'd began maturing; she had began to wear a bra, becoming very concerned with her appearance, normal adolescent changes. But until that moment, he had been unaware of how just much she had changed. Although Sara was wearing a one piece bathing suit, Mark could see that her breasts had matured; proportioned to her small frame, but firm and full. She had always been what you would consider cute; Long, wavy brown hair past her shoulders, and big, soft looking eyes. Sara had always been thin, but now he could see there was a curve to her hips. With her petite size and thin physique, she had developed a very attractive figure.