Mary and her twin sister Brandy had shared a rather taboo fetish since they had been young teens; watching movies such as Species 2 and Xtro. Watching those young women swell, their bellies grow so round until they burst had stirred something unexplainable in the two young women, something they enjoyed sharing together. So at the ripe young age of thirteen the two began experimenting; exploring ways to fill their bellies until they felt as if they would pop. Water and food worked to a point but food only made them sick and water was to hard to hold inside them safely so they turned to air. By eighteen, they had developed into very beautiful young women; full lips, sparkling blue eyes, both with lustrous black hair; Mary had cut hers short about the shoulder while Brandy wore hers in long to mid back. Both were curvy, and sported rather ample bosoms; Mary a good 36 D while Brandy measured at 38 D. Do to the inflation they both had tight stomach muscles which made their bellies flat and firm. Mary had a little bit bigger butt only because Brandy was the more athletic of the two. At eighteen they had become rather skillful at pumping themselves and one another up so full and tight with air their bellies looked like massive swollen balloons; the flesh so taunt it became shiny, their waists gravid orbs that made them look many, many months pregnant. It was their twentieth birthday and after celebrating with the family they decided to have their own little celebration.
“So, how far do we want to go? I know I got more in me last time!”
Mary looked at Brandy awestruck.
“Bullshit, you little slut! You were too full of Jakes’ cum to take in more than me.”
“Fuck you Mary! I was nearly as big as you even after blowing Jake and you know it.”
Jake was a local boy, a childhood friend who most girls in school adored but had always been Mary and Brandys’ fuck buddy. They had told them about their fetish a few years ago and he had admitted to them about his obsession with pregnant women which began a relationship of sexual pleasure and experimentation that the three loved. Both girls lost their virginity to Jake who fucked them while they had their bellies swollen tight and full with air. They loved the way he touched their super taunt flesh, teasing the dangerously stretched skin as they slowly brought themselves to the very brink of popping.
“Okay, I’ll call Jake and we’ll finally see who can take in the most. I’ll pump you and you me while we take turns blowing Jake. The first one to pop before he cums looses.”
Mary thought it over; knowing that whoever won would have to mourn the loss of a sister but it would be sooo much fun and she had always wanted to feel herself pop; the mere thought of it made her pussy wet.
“I’m in!”
Ten minutes later Mary, Brandy and Jake were up in the tree house they had built; well their fathers had built for them when they were little. It was where they spent most of their time and explored most of their fantasies. Jake ran his hands through his sandy brown hair, looking at both hotties; Mary wearing a yellow tank top that hugged hr big boobs and a short black skirt while Brandy wore a white sleeveless and black tights with a hole cut open in the crotch. The girls had inflatable plugs fixed into their asses and pussies which allowed air directly into the womb and belly. Their pump had hollow dildos attached at the ends which added a much more sexual feeling to the pumping pleasure.
“Are you two sure about this?”
“YES”, they nearly yelled in tandem! Jake shrugged then unzipped, releasing his already semi-hard ten inch monster. He was part African American, part Hispanic and part Caucasian which gave Jake an exotic look which made women swoon. Mary licked her lips and looked to her sister.
“Okay, front or back?”
Brandy giggled, “What do you think?”
“Okay, ass it is. Let the popping begin.”
Both girls sat in a pair of chairs placed next to one another, Marys pump at Brandys’ feet and vice versa, while Jake stood between them; equal distance to both of their mouths. He counted down.
“One…two…three!”
The sound of pumping began to fill the air, the repetitive soft hiss as air filled the pumps and then was shot up into the twins’ anuses. Brandy groaned as she felt air fill her belly, her hand absently finding Jakes’ cock and softly stroking it to full hardness while Mary pumped happily away, rubbing her flat tummy; anxiously awaiting the wonderful swelling. Reaching over, Mary gently cupped and fondled Jakes’ nut sack, causing him to moan softly; his cock now rigid in Brandys’ hand.
It wasn’t long before they both started to show, Marys’ belly rounding out slightly making her look a few months pregnant while Brandys’ shirt eased back a bit, revealing a slight bit of her swelling midriff. Brandy turned her head enough to allow Jake to ease his thick cock into her mouth, sucking hungrily on the head of the big phallus; purposefully making slurping and sucking sounds as her belly grew larger and rounder, the flesh tighter as Mary pumped more and more air into her ass. Mary was panting as she stroked her own swollen sphere, the young woman looking fully pregnant at sixth months with a very large baby. She pulled back her yellow top, exposing the naked creamy flesh of her belly which Jake reached down and caressed softly, rubbing the ever tightening flesh; teasing her navel as it suddenly popped out, forced by the sheer pressure of her air in her swollen tummy. Marys’ sex quivered as a very powerful orgasm began to build within her, the lovely young woman pushing her erect belly button deeper into Jakes’ palm. Marys’ rhythm faltered as her impending climax drew her attention and her poor belly ballooned rapidly now looking eight months heavy with child. Mary almost wanted to loose as that point, to burst in orgasm but she instinctively began pumping her foot faster and faster, expanding Brandys’ round, turgid sphere; her big belly quickly catching up to and surpassing the size of Marys’; Brandys’ tummy become huge in comparison, looking now almost nine months along, almost to the point where she would be pregnant with twins, light pink stretch marks forming on her rounded sides.
The sight of the two swelling beauties was drawing Jake closer and closer to is own climax; cum welling up within his loins. Whorishly the sexy, swollen bellied twenty year old sucked on Jakes’ cock, her head feverishly bobbing up and down on his quivering shaft as the pressure within her belly grew more and more intense; her stomach so swollen and ripe that deep blue and red veins mapped the globe of her swell; her stretch marks now a deep dark brown. Mary looked over to her sister, amazed at the shear girth of her belly; looking over due pregnant with triplets. Mary wasn’t too far behind; her navel nearly stretched to oblivion, her flesh pulled too taunt and tight that she felt as if she would pop any moment.
“Ohh yessssss, ohhhh fuuuckkk yessssssssss! Biggger…mmaaakkkeeee biigggerrrrrr…pppplllleeeeaaaasssseee!”
Her over burdened belly felt like a hyper-sensitive clit as her free hand stroked and rubbed the great dome until finally Mary cried out in orgasm, her juices splashing between her legs. Moments later, with her belly taunt and tremendously tight, as if her quints sized belly could burst then and there, Brandy let loosed a muffled groan of pleasure, Jakes’ cock stuffed deep into her throat. He nearly blew his load as she hummed over his shaft, quivering with readiness. Looking at both girls perfectly spherical bellies Jake knew which of the two would be the victor. With care he eased his member out of Brandys’ mouth and slid it between the lush lips of Mary who sucked it down with relish; her tongue twisting about his swollen cock head. Sweat covered all three but Brandy, her poor belly looking pregnant with over due dectuplets was clearly near her end. Orgasms rolled through both girls constantly, their balloon like middles almost perfect spheres, their breasts now too were swollen and tight as some air leaked into them and the constant arousal had their nipples so stiff they could cut glass. It was unbelievable how gigantic they were as both were shook by one orgasm after another. The competition was close, neither knowing who would win but Jake until finally Brandys’ belly took on a slightly transparent look as it distended almost six feet from her slender frame. With her legs spread painfully wide to accommodate the shear mass of her explosive gravidity, the flesh of her waist covered her legs as her whole body shivered with expectancy. Mary could feel how full her sister was for both of them were finding it hard to pump now but her sisters’ concentration was waning, air was pumping into Marys’ own bloated belly much, much slower than before. Beads of sweat rolled down Brandys’ cheek, over her massive, quivering belly. Jake looked at her and pumped faster into Marys’ mouth, trying to time his own climax with Brandys’. Too tight, too full was al that she could think and Brandy was begging to burst by now. Brandy could feel it, her belly was so full, so tight and gravid; there was no more room within her and she could feel herself on the verge of popping as her greatest and most powerful orgasm built inside her. Brandy moaned through clenched teeth as she started to cum.
“P…pummp…ffaasster…yyeeeessssssssssaaarrgghhh….nnggghhh…ooohhh…I…POP!”
The tree house shook with the sudden wet bursting of Brandy as Jake groaned, cum shooting down Marys’ throat into her own close to bursting belly, it was so taunt and tight and massive the poor girl could hardly move, only shiver with the heaviest orgasm of her life. It took a lot of explaining but Marys’ parents accepted what happened to their oldest daughter and were pleased to know she died happy.
Three years have passed since then and Mary, now pregnant with triplet girls visits the tree house every birthday with her husband Jake. Patting her hugely fecund middle Mary looks up to her husband.
“Do you think they will understand about their aunt Brandy?”
He smiled,” I more worried about which one will loose the contest.”
They both chuckled at that.