Chapter 5

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.