Magnificent thrills slammed through Billy's young body as his sister worked her lips on the shaft of his cock and agitated her cushiony tongue against the sensitive underside of his cockhead.
He groaned and began to stroke his cock in and out of her mouth, moving it only an inch or so each way. Kathy's compressed lips crawled along the shaft, and her teeth scraped it. Her palate and tongue rhythmically squeezed the bulbous bead. Billy's balls bumped her chin.
Kathy kept her eyes tightly closed. She was enraptured by the thick, throbbing cock in her mouth. Billy's cock even tasted and smelled good to her now. Her lips and tongue had never been so pleasantly stimulated as they were at that moment.
Though cocksucking had sounded like the most awful thing in the world, she was discovering to her surprise that she enjoyed everything about it. She had been shocked and sickened when she had watched her mother suck Mr. Simpson's cock, but now she understood why her mother had taken to it so happily once she had gotten started.
The teen girl bobbed her head up and down on the pillow, taking her brother's prick all the way back into her throat. Because she liked the feel of it so much, she didn't once have an urge to gag. If Billy's cock had been long enough, she felt she could have taken it all the way into her stomach!
Billy's enjoyment of the act was even keener, and he soon began to feel as if he were about to go off. But he was afraid to come in his sister's mouth. He stroked his prick in the marvelously soft and moist circle of her lips for as long as he dared, then suddenly drew back and pulled his cock from her mouth with a wet, sucking noise. The thing lurched wildly above her face, a mixture of saliva and cock-juice dangling from its tip.
"Oooh, I want it.. I want it!" Kathy cried, and grasped his shaft with one hand and his balls with the other. She tried to tilt his cock back down into her mouth again, but he fought her off and backed up.
"I'm gonna fuck you," Billy said hoarsely. "But I want to give it to you from the back."
"Can people do it like that?" Kathy asked in surprise.
"Sure. There are lots of ways to do it. Hurry up and roll over."
Kathy rolled onto her stomach. Her tight white asscheeks trembled tautly. Though firm, her asscheeks were plumply rounded.
Billy pulled her legs apart and knelt between them. He grasped his cock and tilted it down toward the junction of her thighs. But he wasn't able to get his cock into her cunt. He realized that Kathy would have to elevate her hips more.
"Stick your-ass in the air," he said. "Get up onto your knees."
Kathy complied and her pink slit came into view, bordered by a very light growth of butter-colored curls.
Billy tried to get close to the inviting slit, but still had difficulty. His sister hadn't drawn her knees far enough forward, and her thighs were in the way. He grasped and pushed them, thereby elevating and opening her ass even more. He crawled forward on his knees, gripped the firm stalk of his cock, and wiggled the head of it into her hot little cunt.
He began to pull and thrust, slamming his flat belly against the bouncy cushions of her ass. His cock pumped vigorously in and out of her narrow, slippery cunt.
"Uh…uh…uh…" she grunted, and pumped backward against hint The sensation was very good. She had learned that there was more than one way to fuck, and both ways she had tried so far had proved to be highly pleasurable.
Kathy twisted and bobbed her hot cunt and Billy drove his eager teen cock into it. His stomach slapped noisily against her asscheeks.
Because of his two previous comes, Billy was slow in advancing toward a climax this time. Though the friction of stroking his hard cock in and out of his sister's pussy was very pleasurable, he tired of the uncomfortable kneeling position. After a time he pulled out, and his sturdy teen cock bobbed up and down, trailing juice from Kathy's young cunt.
"How about if you get on top?" he suggested. He had seen that position illustrated in a sex manual that one of the other boys had shown around school.
"But girls aren't supposed to get on top," Kathy said, still poised with her ass aimed high as she looked at her brother over her shoulder.
"People are supposed to do it any way they want to," Billy replied with a touch of impatience. "Shit, there aren't any rules for fucking!"
Billy stretched out on his back, his upthrust cock swaying, and Kathy cautiously mounted him. She discovered that there was a special excitement in being on top and seeming to dominate the male. Billy helped her to fit their organs together, and she let herself down onto the full length of his cock.
"Ooh, wowww!" she exclaimed when she had his entire cock inside her. ''You go even deeper into me this way!"
"Do you like it?" he asked, grinning up at her as she sat astride him.
''It's far out!''
She began to move, gingerly at first, then with greater confidence. She gradually picked up the bouncing, grinding motion that gave maximum pleasure to both her brother and herself.
He bumped upward gently as she bounced and writhed. Her hair hung down at both sides of her face and shone softly in the moonlight as she gazed at Billy with a dreamy expression.
She never would have believed before tonight that her rough, noisy brother could show her such a great time. Sex certainly was fantastic!
Billy felt the same way about the excitement of the moment, but it didn't come as such a surprise to him. His natural masculine instincts had told him there was great pleasure to be had from girls, but he had felt that the satisfaction was out of reach for him at his age. He was immensely gratified to learn that this wasn't so-that sexual satisfaction was as close as his own sister's bedroom.
They churned their loins passionately together, striving for a peak of sensation which they knew would be the greatest they had yet achieved. The surging thrust of Billy's strong young cock thrilled Kathy as he drove the rigid shaft upward each time she settled down. And the clutching warmth of her cunt gave him great delight. They fucked with intense concentration.
As their excitement mounted to a feverish pitch, Kathy found it difficult to continue sitting straight up, and she fell forward, pressing her tits against her brother. He wrapped his arms around her and they continued to pump their hips in short, rapid strokes.
"Uuh… uuuh… uuuuh…" Kathy grunted, the pitch rising as her nerves drew as an archer's bowstring.
Suddenly the arrow flew, and Billy let out a groan as his rich cum poured upward for the third time into his sister's quaking, quivering cunt. She moaned in blissful satisfaction.
Their bodies vibrated together, her spastically clutching cunt milking his prick of every drop of cum he had manufactured during the lengthy fucking. He felt weak, but it was wonderful. As for Kathy, she didn't seem to have an ounce of tension left in her entire body.
She roiled off Billy after a while and came to rest on her back. They didn't speak for several minutes, and they didn't touch during that time. They were occupied by their thoughts.
Tonight had been an education for the teen girl. She had found out what sex was all about, and she had enjoyed it tremendously. She felt guilty about having done it with her own brother, but there was no longer any guilt attached to sex itself. Her mother's admonitions against it now seemed laughable, particularly since her mother had proved by her own actions that she didn't believe what she preached.
But there was a nagging fear that bothered Kathy-what if she were pregnant by Billy?
As for Billy, he too was suffering from guilt, now that the storm of his young lust had blown itself out. Kathy was his sister, and yet he had fucked her-not once, but three times. He also had gotten her to suck his cock.
He couldn't really regret these acts, because they had given him the greatest pleasure he had ever known. But he believed he should have done them with someone else, not with Kathy.
He thought about the possibility that he might have knocked her up. What a bummer that would be! But maybe it hadn't happened. He had never heard of a guy his age becoming a father and, even though he could fuck and produce cum, perhaps he couldn't actually knock up a girl. He clung to that hope.
Finally he rolled onto his side and looked at his pretty sister.
"Are you mad at me?" he asked softly.
"I'm not mad," she said, and drew the tip of her finger along his firm, smooth jaw. "But what we did was wrong."
"I suppose so," he admitted.
"We mustn't ever do it again," she said.
Billy drew back a little and looked at her intently. "But I want to. It was great!"
"Yes. But it wasn't right between us. You know that."
"Sure," he said, and looked down.
"I hope I'm not pregnant," Kathy murmured.
''So do I."
They remained silent for a while, then Billy said, ''Well, I guess I'd better be getting back to my room," He made no move to get up.
"No, not yet," Kathy told him, her voice quivering slightly. She reached down and took hold of his cock.
"Heyyy!" he said in surprise.
''As long as this is going to be our only time," Kathy said tensely, "let's do it once more."
"Do you want to? Really?"
"Yes!"
Though he felt weak from the three fuckings he had given her, he was game to try for another. But he feared it might take him quite a while to get a new hard-on.
As things happened, however, this didn't prove to be a problem, for Kathy had already learned how to turn a guy on fast. Billy gasped in delight as she bent toward his loins, clutching and lifting his soft cock toward her descending mouth.
In the soft glow of the moonlight, she studied the soft cock and she waved it gently to and fro. Then she retracted the foreskin, exposing his pink cockhead, which was still moist from their last fuck. Her mouth watered and her brain danced with excitement as she lowered her head and took the soft, wet cockhead between her lips.
"Ooooh, Kathy…" Billy murmured passionately.
Her lapping, circling tongue licked the rich juices off his prick. Then she settled her mouth lower around the soft column and began to suck gently. Billy groaned and pressed his head back, arching the center of his body.
Kathy bobbed her head and tugged at the slick knob of his cock, which began to enlarge. Gradually the shaft of his cock stiffened. Before long, the teen girl's mouth was filled by her brother's rampant cock.
She crawled on top of him once more, because she had discovered that she preferred to fuck this way. Their organs merged smoothly, and she enjoyed once again the matchless pleasure of having his stiff cockshaft stroking up and down inside her cunt.
To Billy, she looked like an angel as he gazed up at her in the moonlight. Her golden hair shimmered and her eyes glowed with warmth. But the quivering of her shapely tits contributed an earthiness to the vision, and the way her cunt felt as it clutched his cock was nothing like he imagined an angel might feel.
He bucked upward into her, but in spite of the stiffness of his cock, and the pleasure he was experiencing, his body remained largely relaxed. He felt as if it would be a long time before he would be able to reach a climax.
Kathy felt the same way and, after pumping up and down on his prick for several minutes, she became tired.
"You get on top now," she said, and rolled onto her side..
But Billy didn't roll all the way over. They remained linked, one of her legs hooked around his waist, and he resumed pumping as they lay on their sides. She picked up the rhythm once more, and they fucked that way, enjoying sex in yet another position.
Many minutes passed and they didn't seem to be getting anywhere. Finally, from sheer exhaustion, they were forced to stop moving. But they remained joined.
They were both so tired by that time that they promptly fell asleep, still entwined; Billy's young cock remained stiff inside his sister's warm, tight cunt.