"Oooooohhhhhh… Fuck me from the back," Niven pleaded suddenly, turning over abruptly on her belly and presenting him the milk-white orbs of her firm, hard ass-cheeks. Instinctively, his hands went out and kneaded the pliant flesh, grasping her firmly by the hips and raising her up until she was on her knees. His eyes stared hypnotized at the tantalizing globes, smooth and pear-shaped without flaw, and unerringly, he guided the thick shaft of his cock towards the faint glimmer of moist flesh visible below the graceful curve of her ass.
In her mind, this was almost the same as being fucked by Siegfried, and all the more thrilling to Niven for that. She did as she would have done with her beloved dog… reached back and grabbed his hardened penis in her slender fingers to guide it toward the twitching entrance of her hungry cunt. Mark, his hands digging into the soft, resilient dough of her buttocks, could stand it no longer, and with a heave, he slammed forward and planted his towering penis half-way up the wet, slippery channel of her naked, seething pussy.
"Uuuuuuuuuu-ggggg-hhhhhhh mmmmmm… oooooooo-hhhhhhh…" Niven moaned as she felt her cuntal passage flowering open to accept his deep thrust. He continued to slide forward, feeling the soft willing walls of her vagina slip around his engorged penis like a wet, velvet glove, until he finally hit bottom, the hard rubbery head of his cock touching the sensitive membrane of her cervix, and his contracting balls wedging neatly beneath the whitely rounded spheres of her backside.
"Aaaaaaahhhhhhh… ooooooohhhhh…" Niven sighed again, feeling replete with his masculinity, completely impaled on his lust-inflated penis. She could feel the crisp dark curls of his pubic thatch tickling the soft skin of her ass, and she knew that he had sunk every millimeter of his cock in her depths. She knew she had been right to go through so much trouble to get him to fuck her. The feeling of his penis in her cunt from behind like this was sheer bliss, and to think… he lived right next door. She could have him any time she wanted. The near wicked sordidness of having an affair with a married man who lived less than twenty feet from here really appealed to her. It was a liberating feeling, and Niven had liberated herself a long time ago!
Slowly, Mark began to withdraw, easing his bloated shaft out of her soft welcoming depths, until just the head was wedged between the resilient moons of her buttocks, before ramming forward again, almost overturning Niven with the strength of his thrust.
"… Ooooooo-gggggg-hhhhhhh-nnnn…" she gasped again, "that's lovely… ooohhh… that's beautiful… lovely…"
Mark began to move his heavy penis inside her, rotating it gently, feeling the responsive throb of her inner pussy walls as she flexed her supple interior muscles with a clearly practiced ease. Her cuntal muscles began a milking, rhythmic contraction and squeezing, until he felt that he would explode in her at any moment from the delicious pressure.
He began to saw in and out of her, loving the way she thrust back against him as he plunged to enter, and thrilling to the way she tightened as he pulled out. Not even his own wife, his own sexual creation, had been this skillful, and Mark felt himself possessing a new and vibrant vitality. He had lost none of his own skill… a skill that had made him very popular with a lot of women at his college before he had met Kate.
His hands reached forward to squeeze the ripe melons of her breasts hanging enticingly from her gently undulating body. He rubbed the hardening buds of her nipples, running them between his fingers, making her shriek with pleasure. In the back of his mind, something warned him that his wife would be able to hear her shrieking, and think that something was happening to her, but he quickly put that thought out of his mind. There was no way his wife could possibly know that he was fucking Niven. There was no one in the entire world for the cheating newly married young husband for Niven now. No one… NO ONE could possibly derive as much pleasure from fucking as Niven was right now, and her enthusiasm was transmitted to him, making him experience more pleasure than he would have dreamed possible.
The heated pressure in his body was building up to a fever pitch, and his furiously deep pumping increased in velocity. Their bodies were bucking soundly against each other, jerking and twisting and gyrating and merging as one.
"God… Niven… that's it… fuck back… fuck back hard… move that ass of yours…" he gasped, his face a sweating mask of lust and passion, his head flailing from side to side.
"Oooohhh… you… feel… soooooooo gooooooooodddd… inside… me…!" Niven panted, her body cavorting with paroxysms of pleasure. "I'm going to cum… I'm cumming… cumming… almost there… there… I'm… I'm… there… Aaaaaaaahhhhhhhhhhh!!!"
And Niven was cumming, her buttocks waving like a flag in the wind, the force of her spasms jerking his penis unbearably. Her mouth was uttering incoherent mumbles, and her shrieks were as wild and unabashed as the rest of her vibrant way of thinking, but Mark didn't have time to consider any of this, because he was cumming too. A deep, harsh strangled moan escaped his throat as he pounded his hips against Niven's thrashing buttocks with the power of a jackhammer, and he moaned again and again as he felt the first rumblings of his seething sperm escape the darkness of his balls and rush headlong like molten lava into the depths of her milking vagina. Stream after stream, like a flooding unending river, entered her cunt from the throbbing tube of his penis, filling the hot, slippery canal of her thirsting pussy.
"Keep… fucking… back… fuck back… fuck back!" he hissed, his voice hoarse with the lust he felt. Finally, though, it was all over for him, and he noticed, with disappointment, the last dregs of his cum-juice being drained from him. Finally he was satiated, and they lay against each other, his penis deflated and flaccid, both panting, their commingled juices flowing from Niven's pussy lips and staining the carpet below her.
As he lay there, Mark found that he was now able to think clearly… more clearly than he had been able since he had walked out of his next-door apartment. All his frustration and lust had been spent, allowing his mind to dwell on what had just taken place.
My God! I've just fucked another woman… a woman who is not my wife!!!
Even though he realized that she had all but raped him, he knew that he should have managed to keep himself under control. When he had made his marriage vows, he had truly meant them, and here, at the first chance he had had, he had merely cast them aside in favor of a few moments of pleasure. No matter how seductive Niven had been, there was no real reason for him to weaken as he had. He had married his wife because he loved her, and trying to hide from their problems by running out, getting drunk and fucking another woman wouldn't solve anything.
In fact, since Niven was his next-door neighbor, it would only make things worse. Meeting this lovely young blonde woman again was inevitable, and he wondered how he could look her in the face. She had been nothing but a vent for his lust. That was all she was to him, and he didn't know how he would be able to tell her that… not after what they had just done!
He heard Niven stirring next to him, getting her strength back before he did.
"Are you always this quiet after you fuck?" she asked, lifting her naked body up and looking down at him. There was a playful smile on her face, as though she didn't take any of this seriously.
Mark opened his eyes and looked up at her, his face no longer contorted with conflict or arousal, but wrinkled with worry… and a sense of guilt.
"There… there's something I have to tell you," he said, his voice barely above a whisper. Now that his mind was cleared, he was actually afraid that his wife would hear him through the walls.
"Ooohhh… do you have a disease?" she asked, her voice sounding strangely child-like. For the first time since he had met her, Mark wasn't certain about her age. At first, she had acted and carried herself as though she was his age… college age.