Margo kept her word. She told Mark that their sister was ready to have her cherry popped. The first day everyone else had something to do away from the house, leaving it entirely to Nikki and Mark, the brother and sister went for a swim in the family swimming pool.
They dove into the water and swam vigorously, more or less ignoring each other at first. Both of the teenagers were trying to work off their excess sexual energy.
Finally they stood in the shallow end of the pool, their heads and shoulders above the water, facing each other. Mark felt an ache in his balls, and the blood pumping into the head and shaft of his cock.
Nikki had taken note of the large bulge in the crotch of her brother's bikini briefs. She had never seen a real cock before, and she could hardly wait to get her first glimpse of Mark's, although she still was not at all sure that she was ready to be fucked.
Mark reached out and placed his hands on the sides of the girl's slender waist. His hands were large and as he held his sister around her middle, the tips of his middle fingers almost touched at the small of her back.
"Margo told me what you want, baby," Mark said huskily, thinking how sexy his sister looked in her skimpy bikini.
"I-I don't know, Mark," the girl said.
"Shhhh, just leave it all to me," Mark said soothingly as he pulled her up tightly against him.
Her hands instinctively moved up to the back of his strong neck and she laced her fingers together. She found herself rising up on her toes and pressed her tits against his manly chest.
Mark bent down a bit and their mouths touched. The teen's cock grew thicker and harder as the teenagers kissed for a moment and then stuck out their tongues, tongue-kissing each other over and over again. Nikki's nipples were making visible bumps in the top of her bikini, and Mark groaned as he felt the rock-hard nips crossing against his muscular chest. Mark and Nikki rolled their tongues together erotically, holding each other tight. Nikki could feel her aroused blood pumping downward in her body toward her crotch, and she knew that her pussy was swelling.
"Mmmm," she moaned into her brother's mouth.
The virgin felt her nips throbbing and burning against her brother's chest, demanding to be caressed by the teen's fingers and mouth.
The girl's pussy was flowing with fuck juice now. She knew that her bikini panties were soaking wet, not only with pool water but with cunt sauce.
Nikki felt her clit growing to three times its normal size, and it was pushing out from its fleshy sheath. The teenaged girl thought, with a pang of hope, that perhaps her sister was right after all. Maybe, just maybe, the fact that Mark was her own brother would be such a turn-on for Nikki that she could match his passion and lay to rest once and for all her fears of being gay.
Mark had a raging hard-on crammed inside his tight briefs. It felt to the teen as if his cock were going to tear right through the material at any second.
The brother and sister continued to tongue kiss each other for long moments, turning on more and more. Then they climbed out of the pool and sprawled together on a broad chaise lounge near the pool.
Watching each other hornily, they quickly tore their suits off and Nikki gasped with sheer sexual excitement as she saw her first cock… her brother's cock.
A full nine inches of throbbing cockmeat was standing at attend on, jutting straight out from the teen's bushy loins. His prick was thick, too.
Nikki broke out in a sweat as she wondered just how far her virgin cunt was going to have to stretch to take that mighty prick. She swallowed hard and stared at her brother's balls, which dangled low beneath the base of his prick. Her mouth began to water as she saw that the entire length of Mark's prick was bobbing up and down with sexual anticipation.
"Ohhh, Mark," she said throatily, feeling her pussyjuice rolling thickly and hotly down the insides of her naked thighs. And she groaned as she felt her clit twitching violently at the top of her pussy-slash.
"Unh, oh, baby, you're really something! I've never seen you naked before, but believe me, I've wanted to!" the teen cried.
The girl's inner cuntlips were so swollen with lust that Mark could see them dangling out of her pussy. He couldn't believe how almost bald his sister's cunt was. He had never fucked such a pussy and, for some reason, the idea of fucking one now made the ache in his balls increase. Suddenly, Mark's cockhead snapped upward, slapping him in the belly.
"Oh, God!" Nikki groaned, rising to her knees.
She licked his balls, and then sucked them while her brother lay back in the chaise lounge, groaning with excitement. Nikki thought about sucking him off, but she wasn't ready for that. She didn't know if she would ever be ready for that. The thought of sucking a guy's cock and swallowing his cum still made her feel sick to her stomach. She lay back in the grass now, her cuntjuice dribbling out from between her puffy cuntlips, and running into the crack of her ass.
Mark stared down at his virginal sister, feeling his prick throbbing harder and harder. His cum-slit pulsed relentlessly, and his heart raced.
He watched as his sister spread her legs wider and then he fell to his knees between her splayed thighs. He sprawled on top of her and they both moaned with incestuous pleasure as they pressed their naked bodies together.
Mark could feel the girl's huge tits pressing against his chest and he felt her nipples, rockhard now, throbbing against his flesh.
Nikki moaned, feeling the entire length of Mark's prick pressed up against her lower belly. She shuddered, thinking just how deep her brother's cock was going to have to go to completely penetrate her cherry cunt, and she knew instinctively that deep penetration was exactly what they both needed.
For now, the horny girl was no longer trying to fight against her natural desires, no longer trying to tell herself that she may not want to fuck with her brother. She did want to very much so. But there was a bit of nagging doubt at the back of her mind, and she had to wonder just how much she would enjoy it.
The idea that this virgin fuck was a sort of test for her, that it would answer for her the tormenting question of whether or not she was a lesbian, filled Nikki with tension.
The base of Mark's cock was pressing against his sister's golden pussy patch, just above her pulsating clit. She groaned again, realizing that in just seconds the tip of her brother's prick would be lodged deep inside her cunt. She just hoped that she wasn't taking on more than she could handle.
Maybe I should have chosen a guy with a much smaller cock, she told herself. Almost before she finished that thought, she had to admit to herself that a smaller cock would not have turned her on nearly as much as the massive one pressed against her, now.
She tried valiantly to push her fears into the back of her mind, trying to think of nothing but the pleasure she was sure to experience when her brother popped her cherry for her. Brother and sister kissed each other hungrily, both of them panting like wild animals in heat.
"Mark? You know that I'm a virgin, don't you?" she asked nervously.
"Sure, baby, Margo told me. She said that you and she have made it a lot of times but that you veneer been fucked by a cock before, Mark said, his mouth and throat going dry with the exciting thought that soon he would be popping this sexy girl's cherry."
"Right."
"I feel privileged to be the first, baby," he said thickly.
"Oh, Mark, I'm so scared! And I'm afraid that if we wait any longer, I may change my mind! Please fuck me now, Mark!" the girl cried tearfully.
Mark grinned down at her, only too happy to give her what she was begging him for. He put his hands flat on the ground on either side of his sister's head and pushed down, straightening his arms as he did. He arched his back and lifted the upper part of his muscular body.
"God, yes, do it, Mark!" the girl gasped, feeling just the tip of his cock touching her now.
Mark moved his hips back and, staring down directly into his virgin sister's eyes, he pushed the head of his prick between her swollen cuntlips. He knew that her pussy was super tight and tiny and that his huge cock was going to hurt her. He knew that it would take same brute force just to bury his prick inside her. There was no way he could prevent the pain she was bound to feel. He figured that he should just pop her cherry as quickly as possible, getting that painful part out of the way before getting on with the serious business of fucking.
"Please, Mark," the girl whimpered, "please fuck me! I don't care if it hurts!" It was a lie. She did care, but she knew that she could not afford to let her fear of the pain stop her from doing this thing that needed doing.
Mark took a deep breath and then stabbed down with his cock just as hard as he could.
"Yeeeeeegaawwwdddd!" the girl cried, her eyes flying wide open as she beard the tearing sound of her cherry being ripped away and she felt the most agonizing pain she had ever experienced shooting through her ravaged pussy.
"Does it hurt, baby?" Mark asked, realizing immediately what a stupid question it was.
"Yesss, oh, gaaawwdddd, yesss, it hurts like hell!" she sobbed. Tears filled her eyes and she gasped for air as the pain stabbed through her again and again and she desperately clawed at the ground, not even realizing that her curled fingers were tearing up huge clumps of earth. Her mouth opened and closed soundlessly now and her senses dimmed.
"Do you want me to stop, baby?" Mark asked, even though he knew that there was no way in the world he could stop now.
"Nooo!" his sister wailed, "I have to do this! Fuck me!"
"Okay, baby," Mark said, relieved.
He pulled his prick out of his sister's pussy until only his throbbing cock-knob was still locked inside her pussy. And then, taking another deep breath, he rammed deeper into her again, knocking the breath out of the trembling girl.
"Oh, God! Deeper! Deeper!" Nikki yelled, beginning to feel a deep, pulsing pleasure that blended with the pain.
Mark could tell that it would not be easy to get the entire length of his nine-inch prick inside his sister's tight fuckhole. Her cunt was tight and tiny from lack of use. He would have to pry her pussy open with the thick head of his cock so she could take his whole prick.
Nikki could feel the tip of her brother's prick moving into her aching cunt a fraction of an inch at a time. She sensed that something magical would happen to her when the head of his prick finally reached the depths of her pussy. She only hoped it would be so wonderful that it would convince her once and for all that she was normal.
Instinctively, the teenaged girl began to lift her ass up from the ground. At the same time, she tried as hard as she could to relax her inner cunt muscles so her brother could more easily and fully penetrate her pussy.
It wasn't easy. The pain and the fear of more pain blended with the sexual tension in her loins, making it very difficult for her to relax even one bit.
Mark took another deep breath, paused slightly, then plunged downward as hard as he could. The tip of his prick banged hard against the very back wall of Nikki's cunt and she immediately came.
"Aieeeee!" she cried.
Her inner pussy walls convulsed around her brother's huge cock as she came. Even though he had managed to sink his prickhead into her as far as the back wall of her cunt, his cock was only about halfway inside her, and the thought that there were still about four or five inches of hard meat left to fuck into her filled the orgasming girl with both fear and excitement.
"You came, didn't you?" Mark asked thickly, feeling his hot cum churning about within his swollen balls. His sister's tight pussy was giving his cock the snuggest hug of its life and it felt to him as if his cock were about to burst into a million fragments.
"Yessss," Nikki sighed, sure that it was only the first of many orgasms her brother's big cock would give her.
She threw her feet up into the air and her brother's prick slid deeper inside her. Pussyjuice was gushing out of her fuckhole now, lubricating her brother's prick as he sought greater and greater depths within the girl's virginal pussy.
Nikki squeezed her brother's hips with the insides of her thighs, enjoying the feel of his tensed muscles each time he fucked his prick into her.
She crossed her ankles at the small of his back, spreading her thighs even farther apart at the same time. She wrapped her arms around the teen's strong back, hugging him closer to her.
She whimpered with joy as Mark continued to fuck into her, trying to cram the entire length of his massive prick into her. Nikki was thrilled that her cherry had finally been popped. Her virgin days were over, thank God. And she was sure that Margo had been right. The fact that it was her very own brother who had ripped her cherry from her turned her on beyond belief. She still wasn't sure that it would be enough for her but she already knew that it was more than she would have felt had she let any of the other boys she knew fuck her.
"How's it feel, baby?" Mark asked hoarsely, fucking deeper and deeper into his sister's pussy with each cock-thrust.
"Ohhh, it's sooo good, Mark, keep it up," Nikki responded, hardly able to believe how stuffed with cock-meat she felt. She only hoped that her pussy would not burst with the pressure of the hard prick inside her.
"Don't worry, baby, I will. I'll keep fucking you until I get my whole prick inside you and until we both come!" Mark cried, his face contorting with fuck-lust.
As he fucked into her again, a couple more inches of his prick sank in. Nikki groaned with pain and pleasure. She was surprised at just how elastic her pussy was. The thickness of her brother's cock was stretching her pussywalls to the limit.
"Here goes, baby. This one should do it," Mark growled as he fucked forward violently, finally sinking the full length of his prick inside his sister's aching cunthole.
"Unnhhhh, aaaaarghhh," Nikki groaned, her eyes rolling back in her head.
The girl felt thoroughly impaled on her brother's huge cock, and she trembled all over with excitement. The teen's cockhead throbbed deep inside her cunt. She could feel the entire length of his cock pulsating against the taut walls of her tight pussy.
"Wow! That's great, baby! You've got the tightest pussy I've ever fucked and, baby, I love it!" Mark groaned, churning his hips and stirring his prick deep.
The girl had her wish. Not only had her cherry been popped but her brother's cock was touching her in places which had never been touched before, places so deep inside her that she had thought it would be impossible to reach them. She was filled to the brim with hot, hard prick.
"Fuck me," she wailed, throwing her cunt up against the teen's prick.
"You sure you can take it?" Mark asked with a grin.
"God, yesss!" she cried hornily. "I want you to fuck me until I can't walk!"
Mark continued to press down with his hips, grinding his crotch against hers. He rubbed the top of his cock-base against her blood-engorged clit. She shuddered with lust.
Mark gyrated his hips, stretching the inner walls of his sister's cunt in every possible direction.
"More, more! Fuck me hard!" the girl begged.
He pulled his prick out of her pussy with a teasingly slow motion.
"Unnhh," Nikki moaned, feeling the thickness of the meaty cock tugging her inner cuntlips, stretching them out as he withdrew.
The teen pulled his prick almost all the way out of his sister's pussy until only the head of his prick remained inside her cunt. Her cuntlips gripped the base of his gigantic cock, and she trembled all over. He paused, took a deep breath, and fucked down as hard as he possibly could.
Nikki felt her cunthole filling up again in one fell swoop, and a rush of intense incestuous pleasure shot through her entire body. She flushed all over and broke out in a sexual sweat as her brother began to fuck her tight cunt as hard and fast as he could…
"Fuck me hard, Mark! I don't care how much it hurts!" the girl shrieked.
The girl's cunt made wet squishy sounds as Mark fucked into her over and over again. The lewd sounds just aroused the brother and sister all the more.
Nikki thrust upward with her hips each time the teen fucked downward with his nine-incher. Their loins slapped together rhythmically, slick with sweat now. The teenagers moaned and groaned in unison as they fucked each other smoothly, more and more rapidly, both of them straining for the orgasms they needed so badly.
"Ohhh, commmiiinngg!" Nikki cried just seconds later, pleased to find that this second orgasm was even longer and more intense than the first.
After several more strokes, feeling his sister's tight cunt orgasming violently against his prick, Mark knew that he had to come.
He shuddered all over and his muscles tensed. He fucked the entire length of his meaty cock into the girl's cunt, and she came… along with him. As she came for the third time, she felt her brother's cock twitching and spasming against the stretched walls of her pussy. Her orgasmic convulsions grew even more intense.
"Yeeeooowwww!" she shouted.
"Yunnnnhh, commmiinnngggg!" Mark grunted, the veins of his neck standing out in bold relief as he came hard, dumping his load of jism.
He bathed her inner pussy with his hot sticky cum, filling her cunt with his fuck cream. She instinctively contracted her cunt muscles and tugged at her brother's cock, trying to milk his balls of every single drop of cum.
"Aaarghh, yeah, way to go, baby, work those muscles around my dick!" Mark grunted, feeling as if his sister's pussy were sucking his balls dry. He continued to shoot his load inside her.
"Mmmmm, that feels good," Nikki purred as the last of her brother's cum shot into her and her own orgasm began to subside.
Mark's prick began to soften as he pulled out of Nikki's spongy cunthole. He lowered his face and they kissed each other passionately.
"Well, how was that? Was it just about the greatest thing you ever felt or what?" Mark asked, his voice filled with pride.
"Oh, yeah, it was great all right," Nikki sighed, closing her eyes so she wouldn't have to talk to her brother anymore.
Let him think that she was asleep. How could she tell him that, even though she had enjoyed their fuck, even though she was thrilled that she was no longer a virgin, their fuck had not quite been the super-thrilling experience she had hoped for?