Cheated by nature

Sharon and I are an average mid-forties couple. We have a son in college and good jobs. We have been together since high school. After a few flings with others we married. We learned about sex along the way. Sharon did not learn to climax until after she gave birth. My utterly average six-inch dick almost got the job done but our routine always ended doggy style, Sharon pressing a powerful vibrator to her clit. She claimed not to be able to cum with something inside her so I would pull out until her orgasm subsided then pound hard to the finish. I suspected if I could last longer in the piledriver position she loves, she could cum on my cock. Nothing makes a guy climax faster than his woman urging him to "fuck me harder, faster, don't stop!". Nature is cruel. Sometimes I wake in the wee hours with a hard-on. I would coax Sharon to a twilight state, eat her pussy and work some fingers in while sucking her clit. In this relaxed state she can take all five fingers. Her powerful orgasms push my fingers out with a gush of pussy juice. During some pillow talk after one of these sessions I said I thought she could take a very large penis. After some prodding she coyly agreed. Pressing the issue I told her I wanted to know how big a cock she imagined. To my surprise she indicated over a foot long and quite thick with her little hands! We tried large toys over the next few weeks. Sharon hated the artificial feel and overall weirdness of that scene. While watching porn she asked if I knew anyone as big as those actors. I could see where this was going but I said that I did see a guy at our gym once. Sharon had seen Mark around and could not believe such a nondescript guy could be hung. I told her I caught a glimpse of him in the locker room. It looked like he had a wrinkled soda can between his legs! She wanted me to get chummy with him and invite him over for something. Week after week Sharon asked about my progress with Mark. Finally she took matters into her own hands, struck up a conversation with him, then boldly invited him to a friend's X-mas party. I was furious at first but I could see her pussy was hungry for him. I could not say no. The plan was, I would pretend to drink too much so Mark would have to help her get me to bed. Sharon was dressed to kill party night. Her brown hair piled high ,cat-like eyes made up like never before, and her wide, sexy mouth painted red, accentuating her cute little overbite. She squeezed into a red knit off-the-shoulder mini-skirt with long sleeves . She wore all her rings and bangle bracelets with big hoop earrings. Mark looks Eastern-European, has a long last name with no vowels. He has a big, friendly face and is a bit smaller than me in stature. Once they got me to bed and settled on the couch for a nightcap, I crept to hall. The murmuring and light laughter told me they were getting along. Their backs were to me but I had a great view of the action through the mirror over the fireplace. Sharon leaned forward to put her glass on the table. As she leaned back her hand was on Mark's thigh for balance. She slowly slid it down by his groin and I could see her little finger tracing the outline of his dick. Since he did not object she rested her head on his shoulder and began feeling him up with both hands. With a sigh she leaned her head back, lips slightly parted, and they began to kiss deeply. While her tongue was exploring Mark's, her hands had his trousers opened and, with some effort, tugged his cock free. I knew it was going to be a whopper but this was unreal. In size and complexion, it looked like the business end of a hardball bat swaying above his open fly. Rather than recoil in shock, Sharon clasped her delicate bejeweled hands around the head as if to pray. She slowly ran her fingers all the way down to the base of that home-wrecking club that lucky bastard calls a dick. She lifted his large scrotum and felt the heft of the golf ball-sized nuts. Mark arched his back as Sharon began to kiss and nibble his cock head. She let out a little chuckle and ran her tongue along his urethra, then stuffed as much cock as would fit into her sweet mouth. Mark's cock head was not much larger than mine but the shaft was immense. Sharon could only manage three inches or so before her rather large mouth was stretched to capacity. While gently squeezing his balls, which filled her hand to overflowing, she rolled her head around on his dick. I could not remember her giving a blowjob with such abandon. She would distend one cheek then, slurping loudly, shift her head and greatly distend the other. Mark was in heaven but I could tell by his casual nature he was used to this treatment. Sharon let his cock pop out and with increasing frenzy, bathing his cock and balls with her tongue until they were dripping with her saliva. She slid her little fists up and down his slippery salami. She must have thought it ready for insertion. In one motion she hiked up her skirt and straddled Mark's huge dick. Sharon began rubbing her pussy back and forth on the top of his dong. By the matting of her pubic hair I could see she was lubricating freely. As her grinding became more intense his cock head found her pussy hole and before she knew it almost half of Mark's giant dong slid inside her with surprising ease. Sharon threw her head back and for the first time our eyes met. She held my gaze as she lifted off Mark's cock. Then her eyes rolled back as she slowly lowered her pussy all the way down his dong, queefing loudly as all the air was forced from her snatch for the first time. They settled into a leisurely pace. They seemed natural together. Sharon's pussy yawned lewdly as it engulfed every inch of Mark's obscenely fat dick.I never felt more inadequate or more cheated by nature. I knew Sharon could not take much of this and soon she began to shudder with the first waves of orgasm. She held Mark's head tightly to her breast, her intense climax grew. Fully in the throes of a deep vaginal orgasm, her strong pussy muscles pushed most of Mark's dong out causing it to bend, though quite hard. Mark, used to this no doubt, guided her ample hips and slowly forced his enormous dick past the undulating walls and deep into her cunt. I would never know this sensation I'm sure he takes for granted. I imagined her pussy rippling around the whole lenghth of his cock, bathing it in her hot cum as her cervix spasms against the underside of his glans. A man cannot stand such pleasure long and with a groan Mark emptied his load deep inside my wife. They rocked together for awhile then Sharon let his softening meat flop heavily from her cunt, followed by a flood of female ejaculate mixed with great gobs of sperm. From this intense kind of sex, children, and divorce, are sure to result,. 4548 2.19/512345