SCEPTER ACCEPTOR: How Anonymous transformed to be the ultimate receiver of marecock
For /trash/'s marecock threads
warning:contains watersports and unbirth

>Be Anon in an Equestria with numerous mares bearing oversized horsecocks
>End up as the cumdump for one of those mares (long story)
>Since your arrival, the past several weeks have been hard for you
>Your ass is sore and loosening
>Your jaw is constantly cramping
>It's been taking a long time to get used to the taste of her semen
>Thrown up at least once from the sheer volume of her cum and pre she's been pumping down your holes
>And your 7-inch hard-on doesn't come close to what theses mares are packing; never mind the stallions
>It's evident that you're not built for fucking like these anthro ponies
>And you just don't like being plugged up with marecock
>Enhancing your own meatrod to equine proportions wouldn't be enough to satisfy you
>It wouldn't change the fact that you're still the town's designated sperm recepticle

>Then the spa ponies offer you a deal during your weekly spitroast with your mare
>Their trial-phase "Scepter Acceptor" Treatment: Guaranteed to get those stubborn and/or hesitant stallions under control
>And it was free of charge, on condition that you had to be the feature fucktoy at the VIP lounge for the rest of the day
>You agree

>All they did was get you erect, cover your dick, balls, and peritoneum in a special cream and keep it wrapped in a towel for some minutes and done
>Suddenly your towel flopped to the floor as if nothing was there to support it
>And the removal revealed it its magic
>A pussy
>A plus-sized, fat-lipped, clit-winking, sopping wet mare pussy
>You almost cum from a mere poke of your finger into your new cleft
>Tracing the gash down your super-puffy mons, the divide was longer than your cock was
>Each netherlip must've been as big as each of the twin's testicles; and those things were HUGE
>And you've got a need to shove the largest marecock in the building up your new cunt
>You also think you could even hilt that same marecock
>Cups of female juices are gushing down your thighs thinking about it
>Then Aloe, Lotus, and your mare walk in

>They wanted to see your transformation 
>To witness the results of their gender-inverting product, and to participate in all the benefits it brings
>You knew each of them were at least 12 inches soft, but that was a reason to cover yourself up before
>Pretty much the opposite of the exhibition you're performing for them now
>Subconsciously, you stood up and lifted a single leg straight up like a ballerina to show off your new, unnaturally large mare pussy; glistening with marecum in the lights of the private lounge
>This enhanced flexibility must be part of the package
>And speaking of package, the 3 mares that surrounded you already started getting hard
>Each feminine shaft spilling out of its long sheath, widening and elongating from the sight of a dripping puffy cunt on a human male
>Meanwhile, their orange-sized balls were churning up quarts of marespunk and gave off this unbearably attractive musk
>Your femcum output doubled as soon as the aroma of their scrotums hit your nostrils
>That fleshy clit of yours is winking uncontrollably; but if you understood Morse Code, it would be saying "Fuck Me"
>Your mare leaps at you, and crams as much of her face into your fat snatch as she can
>You orgasm the instant her tongue touches your clit- and it hits you like a freight train carrying locomotives
>You squirt out more marecum on her than your past week of ejaculations combined
>And she was just getting started

>Meanwhile, Aloe and Lotus strolled over to each of your sides, a combined 42 or so inches of mare meat hovering above you
>Without saying a word, and still lost in your haze of orgasm-
>(Oh Fuck, Here comes another one!) 
>You grasp onto the Spa Pony's thick dicks like they were handlebars before you flood your mare's face in cum again
>Then you starting stroking each of those fleshy rods in your hands; the bulging blue one on your left and the pretty pink one on your right
>You lick their flat heads in anticipation for what's to cum
>(Dear Celestia, why didn't she suck me off like this before?)
>Little did you know, there was another side effect to this transformation
>Every time you cum, your puffy outer labia would swell itself up slightly, allowing for bigger cock sizes without losing tightness
>You continued to give handjobs to the twins, while now licking the entire length of horsecock
>You could feel every vein and ridge with your tastebuds
>By the time your mare bulked you up so her whole face, from chin to ears was sinking in your fat crotch cushion, she changed tactics
>She made sure you saw how big and fat your pussy was getting while balling her fingers into a fist and winding up a punch
>Was it to demonstrate how shock absorbent your cunt was?
>Each lip thicker then your own forearm after all, and your clit was bigger than a gumball
>Then she jabbed straight in past your flooded divide
>The pain of your hymen tearing was almost totally dulled from the pleasure of the rapid insertion
>She pushed her fist in until elbow nearly disappeared from view
>You were getting to closer to the main event
>That didn't stop her from driving her fist in and out of me though
>Aloe and Lotus proceeded to now take turns facefucking you
>But the funny thing is, you didn't try spitting out their cocks in rejection like you normally did
>Was this treatment really working?
>You stopped asking questions when the next orgasm hit

>And just like that, Aloe unloaded her semen salvo down your throat
>Cups of white, hot, sticky cum flooded your stomach and...........
>hmm-no gag reflex either?
>Why didn't they give you this treatment when you arrived here?
>No time to think it over
>Lotus gave you the chaser when she rammed her own girthy horsecock down your mouth before you could process anything going on
>She came an identical volume to Aloe, all with that same salty sweetness
>You had to admit, despite having ingested dozens of gallons of futa mare jizz over the past month or so, it didn't taste that half-bad
>KA-THUNK
>something clattered to the floor behind your mare
>She knelt back to pick it up and showed you a long, hollow glass pipe, with some sort of pump on the tapered-off end
>It had the words "Marecock Pump: Empress Size" written one side of its surface
>Your mare said she wanted to wait until your birthday to use this, but today is really special
>She stood up and you saw it
>her normal two feet of marecock was now three, and her width was nearly double what it was
>She'd been pumping the whole time she was eating you out
>And her balls looked like she was smuggling basketballs-if not beach balls between her legs
>She was supposed to have grapefruits down there
>She just says "she's well prepared"
>You just hope you can say the same
>All four of you wanted to see if that huge, fat coltpussy could take all of her three feet of fun
>Aloe and Lotus each grabbed an asscheek and lifted you up so your bloated snatch would be level with her enhanced cock
>You were sweating bullets when her flare kissed your thigh-thick lips

>There was no warning of your most powerful orgasm yet when she pushed it in
>You screamed/sang like a girl when quarts of marecum soaked your mare's invading tsuchinko 
>That puddle beneath you on the floor was growing bigger every minute as your mare lightly kicks the cockpump towards Aloe and Lotus' hooves, intending they would use it too
>But you were too distracted by the distortion of your abdomen 
>A thick, long bulge from your fattening pussy up to your stomach appeared beneath your skin
>You patted the bulge with your hand to attempt to feel the contours and definition of the massive marecock within your new inner walls
>You think your mare might have even plowed though your cervix and into your womb
>Then she shoves the remaining inches of her dick inside, feeling like she penetrated-yep-your cervix
>Guess you spoke too soon
>Your mare exclaims that your pillowy coltpussy makes the perfect cushion for your colliding hips when she hilts
>She swears she could even bounce off those huge, taut cuntlips eventually
>Hell, she'll give you a vulva like a big yoga ball when she's done with you
>That is, if your cum-inflated womb won't end up outsizing it
>But you were still too lost in orgasm to pay attention
>So she snapped you back to reality by slamming her giant marecock back and forth in your giant coltpussi
>And your mare grunts on how wonderfully wet and tight you are

>she especially likes how your soft, bloated netherlips were massaging the base of her cock and balls with each stroke, like getting a titfucking before penetrating
>And when she struck through your cervix? That was like getting a 2nd penetration
>You had no idea your uterus was this sensitive, or any for that matter
>*POP*
>That was the sound of Aloe being done with the pump, and handed it underneath you for her twin sister
>You feel the warmth of her supporting arm being replaced with four-foot long marecock, thick and hard enough to support your body weight
>Lotus was going to join her, getting ready to plunge into your fat, slobbering coltpussi
>Your mare really picks up her pace now, knowing she's gonna cum
>You brace for impact, feeling her head flare up to the width of a dinner plate
>too wide to pull out
>You gush out a gallon of femcum at the same moment your mare's semen touches your womb
>She dumps sheer gallons inside you, inflating your belly in a rather......pleasurable, satisfying matter
>You don't feel the slightest bit of strain as she bloats out belly with untold loads of hot seed
>Meanwhile those huge, taut pussylips of yours only swell bigger, on par with the size of your pregnant-looking cumgut
>Their plump, juicy flesh swell out to your knees when your mare pinches your chubby, soaking lips
>You can't even keep your legs closed because they bulge out so wide
>When she was done filling you up, your mare said that was the best hole she'd ever fucked
>And hopes your ass could at least compare, pulling out of you, showing that her dick looked even bigger now
>Ass? Did that the Spa Pony's salve act on that too?
>Your mare sat down on an overstuffed armchair, marecock still erect while the twins carried you over her
>Setting you down so your backdoor ring now was resting on her flare
>Uh Oh
>She pushed you down to penetrate you as you awaited the inevitable tear of your rectum

>And............it never came
>The pain, that is
>It was replaced by a really good feel of pleasurable stretching
>Your cum-stuffed womb could even feel the pressing marecock through the wall of your rectum
>It was even pushing her hot, spent cum out of your megacunt.
>NO! It actually felt good to have all that cum inside you
>You use your hand clamp your gigantic vulva to manually seal your new passage prevent her seed from escaping
>And Dear Celestia, it felt FUCKING AMAZING to squeeze those impossibly huge, fat, rubbery pussylips together
>You needed a huge, turgid cock to plug yourself up, or two even
>True to your word, Aloe and Lotus stood with four feet of marecock each in hand
>They angled themselves so they each had a flare about to enter your bulbous cleft
>*SCHLORP*
>Without warning, your goliath coltpussy sucks their massive shafts inside its folds and starts to clamp down on each of them
>Now THIS is triple penetration!
>And the twins must really like using their shafts in well-lubricated XXXL creampies like yours, bathing both their cocks in your mare's sperm and your own copius marecum
>Every time your mare pushed your ass down to hilt in your butthole, it pulled you out a bit from the double-marecock stuffing your hyper-sized cunt
>Then, Aloe and Lotus each grabbed one leg of yours and pulled you closer to wedge more giant, throbbing dick into your oversized folds
>It was like you were a seesaw or a railroad handcart being rocked back and forth between the 3 futa mares, and you approached closer to orgasm with every stroke

>Although you could feel that your anus wasn't prolapsing, it was still taking a yard of marecock like a champ
>But its magic was nothing compared to inflated hock of coltpussy hilting two even larger marecocks simultaneously
>Especially now, as at least 2 gallons of femcum erupt from your spasming, blubbery crotchpillow; soaking the twins and clamping down tighter on each of their magnificent rods
>While feverishly toying and squeezing your inflating vulva, your butthole tightens around your mare's own probe
>Seconds later, all three mares pushed into you and fired off their cum cannons
>Your womb and colon were actually containing all the gallons of warm and soothing marespunk being injected inside of you, evidenced by your bloating, spherical abdomen
>And you felt no stain to keep it all inside
>It was like being a cocksleeve was second-nature to you now
>You came again from the pleasurable pressure of cum inside of you
>And your turgid, sopping mass of coltpussi engorged and squelched again until it neared your ankles
>As soon as she was done unloading her salvo, your mare pushes you off and runs out of the room in a hurry, like she was late for something
>The spa ponies said that it was for a surprise
>Not that you paid any attention or anything
>Because when the twins set you down and pulled out they did so over the tile floor in a way your super-sensitive coltpussy lips touched down first
>You squatted down to realize that you could actually sit on your giant vulva like a beanbag chair
>And with plenty of spilled marecum on the floor acting as lube, you push yourself across the floor
>The movement across your sensitive, bloated labia alone makes you cum
>You cum even harder now that you realize that if something as plain and featureless as a flat floor can set you off; then the world is your sex toy
>And then a certain white unicorn mare that entered the VIP room instantly springs a hard-on as she witnesses your cunt puff out and inflate even bigger

>No doubt that going flaccid to erect in the blink of an eye was an impressive feat, but her size....not so much
>She was only two and a half feet in length
>Judging by how fast your fattening colt mons was growing, she won't be getting very deep
>Aloe and Lotus' four foot monsters could barely reach your womb by now
>Such is life as the cuntcolt with a giant balloon of pussy flesh
>That still didn't stop her from splitting her legs to the floor so her apple-sized balls were soaked in your pooling, pungent, feminine excretions
>Her flare was pointed right at the spot where your bloated lips touched the floor
>Without warning, she grabbed a handful of raw and sensitive labia in each hand and pulled you right to her
>The leaky divide of your oversized, bouncy crotch-cushion slid right over her length, lubing the shaft with your limitless supply of marecum
>Your sensitivity was great and fine enough to feel every ridge, vein, and cubic inch of that marecock under you
>Her flare could just almost poke out from the backside
>She leaned in for a kiss and you puckered up
>*SMOOCH*
>After a few seconds of tongue, she pushed you back where you were and proceeded to saw your huge, fat coltpussy back and forth over her pulsing erection
>Your pillowy, plumped-up vulva was big enough to hot-dog
>And she wants to blow your metaphorical buns up even bigger

>Rarity grunts, complimenting how your bold and unique coltpussy was so wet and fat and tight on her pent-up marecock
>She grabbed handfuls of your soft (yet remarkably firm),swollen netherlip, groping and sinking her fingers in its smooth, rubbery, moist skin
>Because of how unnaturally plump and juicy your supersized labia was, she couldn't resist reaching her hand into the top of your divide and try reaching for something
>You came yet again when she found and grabbed onto it: your clit
>The resulting orgasm inundated the floor beneath you in another inch-deep of femcum
>There was another expected swelling of your dragon-sized cunt, but it only surged a little bit
>Instead, you could feel the majority of the growth magic was going right to your bulbous clit
>You looked up to see Rarity's horn was glowing, attempting to redirect the swelling into your feminine nub
>Except that nub was over a foot in length and nearly a palm-width in girth
>It was like she was giving you a pseudo-marecock
>She rolled herself over to expose that wide, marshmallow ass of hers while her cock remained in place between your drenched folds
>You've been wanting to do this for a long time
>Good thing your hypercooch hasn't pushed your feet off the floor yet
>Your plant your feet on the soaked floor and push off, ramming your pseudocock into plump, ivory, unicorn ass

>Rarity squealed as she felt enhanced cuntboy clit dilate her anus wide, while your huge, squishy cunt massaged and stroked her marecock
>This was something deprived from you ever since your arrival
>Your mediocre seven-incher you used to have never saw action on Earth
>Only your mare domme ever let you out in inside her once or twice, but its unimpressive size was nothing she was very thrilled in experiencing
>But now, the tables have turned; even if this wasn't exactly the way you envisioned it
>But who's gonna argue when your plunging into that squishy marshmallow butthole?
>And you're literally sitting on the queen of all vulvae here!
>Since that super-clit was especially sensitive, you start cumming after a few dozen thrusts
>Cue the labia fattening up further, along with the clit-cock up Rarity's ass
>As it expanded throughout her rectum, it swelled and bulged in the just right spot
>Rarity's prostate was stimulated by your bulging, and instantly made Rarity cum
>Over a gallon of her marespunk shot out behind you, leaving a trail of pearly-white slime that matched her coat
>Your pussy could sense the tiniest pulses in her erect shaft, as well as the turbid motion and flow down her urethra
>Too bad you couldn't simulate cumming inside of her, since your warm cascade of femcum was currently bathing her cock
>So you settled for the next-best thing

>You had a hunch that not only your new pussy and womb were enhanced
>But your cum-bloated womb was bearing down on something in front of it
>Something bigger than you remembered, and faintly sloshing
>While your pseudopenis was still inside Rarity, a smaller, ignored hole beneath it was pointed at just the right direction
>After several seconds get a feel for where the right muscle group is, you relax it to unleash a river of gold
>You sigh with incredible, pleasurable relief as your stream of piss soaks and stain's the unicorn's white coat yellow, sinking deeper onto your fat, blubbery chair of pussyflesh
>Rarity moans at being drenched your delightfully warm extract, pulling herself out to soak her legs, hooves, and still-erect cock
>She knew that this an elite, prim, and classy mare like herself has standards, and would feel disgusted to further engage in this taboo if it were with any other pony
>But your mass of fat, bouncy, piss-gushing coltpussy was just too erotic to resist
>She slid herself under your gigantic crotch cushion, letting her sizeable chest, arms and face get caught under your deluge
>The blubbery fatness that was your oversized labia kept the rest of her body warm
>She opened her mouth to taste
>After a second or so,  she leaned up and started drinking straight from the tap
>Peeing may have felt great with your hyperpussy to sit and lean on, but Rarity's lapping at your urethra just increased pleasure ten-fold
>She stops after drinking a gallon or so (that bitch! you were about to cum!) to say your pee is like a sweet, refreshing lemonade
>Rarity stands up, shaking her distended belly, sloshing from all your renal extract she drank
>And says it makes her want to piss out, too
>You were too distracted by the erect, alabaster, 30" marecock bobbing up and down between her legs
>The unicorn takes hold of her rod and rams it up your flowing urethra, plugging it up

>A few seconds and several facial winces later, Rarity started peeing into your bladder
>She never would have thought pissing while her throbbing marecock was penetrating something would feel SO FUCKING GOOD
>She regretted not doing this when she was sodomizing Anon last week in the spa
>But now she had something better to use: a self lubricating orifice with fat and softness surrounding it to hold onto
>And having marecock piss in your own pisshole felt wonderful as her stream of gold made contact with the walls of your bladder
>Was there anything at this point that didn't feel pleasurable when inserted inside you?
>After Rarity emptied her own bladder, She realized that her marecock was in a properly-fitting hole
>She began to mindlessly hump your mountain of pussyflesh, able to hilt herself directly inside your bladder on each stroke
>Oh Celestia, here we go again
>You were loving it because of of low your sensitivity threshold was
>Rarity loved pissing and fucking and how godly wet and tight and fat and soft and round your leg-straddling coltpussy felt
>She loved-no-she wanted to WORSHIP your coltpussy
>It wasn't long until you came again, tightening your urethra around her bladder-invading cock
>And the eminent orgasm-induced vulva inflation occurred again, finally pushing your feet off the ground
>You couldn't even reach the floor with your legs straightened
>As she felt your expanding coltpussy press into her knees and your urethra constrict her fleshy marecock, Rarity unloaded a fresh semen salvo to plump up your belly with twice the amount of jizz from before
>She wasn't planning to stop her coltpussy worship anytime soon, though
>Rarity wanted you even bigger

>Bigger?
>At this point, your vast twin lobes of netherlip had grown to the point of immobilizing you; and she wants you bigger?
>Rarity pulled out of your pisshole, releasing several gallons of a milky yellow urine/semen cocktail over her still-hard marecock
>She slid her entire slick body through your long and narrow gash, parallel with your bed-sized coltpussy
>Embedding herself, she proceeded to lick, nip, fondle, kick, and massage and manipulate every bit of fat of flesh she could see and reach
>Meanwhile, you were screaming in pure ecstasy from every movement the white unicorn worshipper made
>No doubt she was making you grow again, swelling your king-sized crotch cushion round, tall, and wide
>Every minute you were getting bigger, fatter, puffier, bouncier, plumper, wetter, and juicier; all while retaining smoothness, tautness, and the perfect balance of softness and firmness
>At the same time, Rarity was diving deeper and deeper down your birthing canal
>When Rarity reached a thick, muscular wall, her horn glowed and dilated a small aperture in the middle of the barrier
>She was met with a deluge of thick, white marejizz from those other 3 ponies who fucked you into oblivion just minutes ago
>That didn't stop her from crawling inside your inner chamber
>Slowly but surely, the contents in your bulging womb were being replaced with a futa unicorn mare obsessed with your supersized coltpussy
>By the time Rarity slipped herself all the way inside, your gut bulges out like you literally ate a horse
>Then, alone in your cavernous womb, it's just her and her marecock

>She has no problem sticking its flared head in her mouth and sucking it, deepthroating it, and magically jacking it off
>It's so erotic to her realize she's inside your womb, playing with herself 
>Without warning, she cums one last time, and it's a BIG load
>Her copious mare semen displaces all the air inside at it fills you with all the seed she's got
>Outside, you can feel your belly grow and bloat as you inflate to a tight, round sphere of futa marecum; draining her bloated testes
>You orgasm uncontrollably, puffing out and inflating your balloon of a coltpussy out to unimaginable sizes
>Good thing your transformation made you super-flexible, as your tera-pussy swelled wide enough for your legs to do a split, lest you dislocate your hips
>As air runs out from the displacement, Rarity stopped cumming, finally spent and wanting to rest
>But then her softening marecock snakes towards the wall of your uterus and fuses to its surface 
>At first, Rarity grows worrisome and tugs at it, realizing she was being leashed to your womb and could end up drowning in her own cum!
>But seconds later, she could feel her semi-hard marecock throb and pulsate like she was cumming
>Suddenly, she felt like she had no need to breathe
>Both of you felt eachother's life energies and blood flow through your connection
>Her marecock has become her umbilical cord
>Now there's no risk of accidentally drowning in her pool of thick, warm semen 
>In fact, it's acting as cushioning to keep her floating and perpetually warm as she starts to rest inside of you, breathing through her umbilicock
>And you were stuck here with an unbirthed unicorn that loved your, entire now-feminine, reproductive tract; and no way to move
>Fuck, how were you gonna get out of here?

>Your question was answered when the floor suddenly gives out from under you
>A big trapdoor, surprisingly wide enough for your tera-cunt to fit through swings away, making your fall down a deep, dark pit
>Along with the combined volumes of femcum, semen, and urine that's been soaking the floor for the past hour or so
>Seconds later, you make impact in deep of water
>*KER-SPLASH!*
>The resulting cannonball makes a big wave that spreads down to the edges of the pool around you
>The visicous boldily fluids that drenched the VIP louge followed suit, splashing down from all sides
>Where were you, anyway?
>As your eyes adjusted to the dimmer chamber you landed in, you deduced you were in some sort of cavern
>Lighting was strung around it walls, and even on the smooth stone "shore" several yards in front of you
>You craned your neck above to catch the glimpse of the trapdoor closing up
>It must've been 50 or 60 feet above your head
>You feel from that height, and this pool of water broke your fall, if not your-
>You glance down to realize that you were bobbing like a cork thanks your bouncy behemoth buoy of coltpussy
>And it wasn't even halfway sunken below the waterline
>Powering through its sensitivity, you gently poke and squeeze at the top of your gargantuan vulva
>It felt so smooth and light and rubbery, it was if it were inflated by air
>Grown so large now that you could lean back on it, too
>Your fat, fleshy cunt was a raft, a dinghy, a pool toy
>A toy, yes
>Your marecock-receiving orifice was a now fucking balloon toy
>A floating mass of sensitive softness that was splitting your legs horizontally, ready to pleasure anypony that comes to seek you out
>Speak of the devil, two mares in the distance approached you from the shore and waved
>They were your mare, and Princess Cadence from the Crystal Empire!
>What was going on?
>They call back, commenting you huge and fat your pussy got; along with your belly, not knowing you just unbirthed a spa patron

>Your mare tells you she wanted try something else with you
>The dim light of the cavern made it hard to make out their appearance from floating this far away from them
>You could see her legs were spread wide from something big bulging between her legs and nearly the touching the ground
>Still, whatever she was packing now didn't exactly compare to a coltpussy that could hilt a telephone pole by now
>Princess Cadence, standing with a marecock longer than she was tall, would fit you better
>Her horn began to glow a silvery blue while a matching aura surrounded your mare
>With a simple nod of Alicorn magic, she picked up and flung your mare into the pool with you
>Like a cannonball, she made a huge splash; reflexively making you look away and hold up your arms to shield yourself the incoming wave
>After the waters hit, you drop your defenses to witness your mare floating upright on a-
>mega-sized pussy
>What happened to her marecock?
>She starts apologizing that she never really understood what your predicament was like, always being the designated cocksock
>Or how your human anatomy was never properly suited for marecock acceptance
>And never would've thought how orgasm-inducing or fun or blissful it was to have a giant, inflated cunt that could perfectly accommodate even the largest of throbbing, veiny marecocks
>She said she transformed with that same genital-changing salve that you took earlier, and Cadence was busy blowing her up to size
>But she still needs a lot of catching up to do; and wants to make up for her misunderstandings
>Your mare gives the word, and suddenly, Cadence magically picks up the two of you, flips you both on your backs,
and began mashing each other's fat, bulging, balloon-pussies together
>SQUISH
>PLOP
>SQUELCH

>Today was sure full of surprises
>First, your mediocre male genitalia were replaced with a super-elastic vagina capable of comfortably fitting in any size of marecock
>Then, you found out that not only was your vulva made highly-sensitive (to pleasure), but it engorged and inflated every time you came
>Then you realized your womb and bladder had a virtually limitless capacity
>And the fact marecocks could transform into makeshift umbilical cords upon contact with your uterine walls
>But now? Although you transformed into what was meant to be the biggest and fattest futa mare cocksleeve in the world, you were cumming your eyes out as Cadence manipulated you and your mare in hyper-pussy tribadism

>Your mare, however was screaming her very soul out in orgasm; Cadence coaxed your mare's pussy to bloat bigger and wider to catch up to your dimensions
>The repeated collisions of both pairs of gargantuan pontoon-pussies were making the two of you cum and piss by the hecto-gallon; slowly but noticeably making the waters you floated on rise within the cavern
>Cadence, meanwhile was magically stroking and expanding her alicorn giga-cock, not wanting to miss out on fucking the two largest, wettest, fattest cunts in the world
>6 feet became 8 feet
>Then 12
>and getting longer
>Her width was like that of a tree trunk-maybe two; and her flare was gonna be triple that
>Meanwhile, her still-enlarging balls were already touching the soaked ground as you and your mare's accumulated excretions were rising to cover them
>By the time your mare was a little over 80% your size, and your combined waters were at Cadence's thighs, she flared her wings and flew towards the two of you, raising your masses out of the water; giant taut pussylip-to-giant taut pussylip
>Then she reamed her 15-foot marecock right between each of your hypercunts, resulting in an orgasm that showered her pseudo-stallionhood in piss and marecum

>Cadence was drooling in raw bliss from the sensation
>Nothing was so perfectly fat, slick, soft, and huge to massage her massive horsecock than a pair of equally-sized vulvae
>Especially your warm, plush, gushing balloon of coltpussy, with an orgasm hair-trigger
>Shiny was going to beg for equipment like yours as Cadence continued to grow in size
>By the time she stopped, her marecock was almost as wide as she was tall, and her length was at least 5, if not 6 times that
>The balls floating behind her swelled to nearly as big as your enormous floating island of pussyflesh; churning, turgid, and inflated
>With a sharp flip back, her marecock tilted upright, hooking your enormous coltpussy onto its head
>While Cadence leaned back on her twin buoyant balls, levitating your mare's own hypercunt onto her body
>This was the ultimate test of marecock acceptance
>All it took for you was one slight lean forward, and you shriek in another one of your heavenly orgasms as your slide down 30 feet of marecock all the way to the hilt, thanks to your frictionless femcum
>Only, your coltpussy was so fat and rubbery and inflated, it bounced right back up to the top of the head of her monster after impact
>When you arrived at the top again, you felt a magic wall of resistance absorbing your upward momentum that proceeded to push you back down, making you orgasm and slightly bloat again
>Cadence was dribbling you like a basketball on her cock, stretching your distended abdomen impossibly far, like, several yards past your head to accommodate an enhanced alicorn cock

>Meanwhile, Rarity was napping in your womb, subconsciously massaging and groping the long, thick rod-shaped intruder that popped in and out of her hiding space every second
>Her semi-flaccid umbilicock was still anchored to you, exchanging one another's life forces
>But given how huge and fat your coltpussy has gotten, and the fact that your "connection" seeking an equilibrium, Rarity's marecock snorkel started to siphon directly off your mass of pussyflesh, elongating and thickening her shaft and inflating her balls to a massive size
>And back outside, Cadence wedged the top half of her body under your mare's bloated, plump cunt
>She grabbed, squeezed, licked, nipped, hugged, pushed, and pulled at every square inch of warm, inflated pussy she could see or feel with her hands, horn, and even her wings
>She coaxed out gallons of femcum from your mare to soak her; also causing her to piss out a river of gold from her distended urethra onto the base of her super-sized alicorn marecock
>In your haze, you release your own bladder pressure, dumping even greater quantities of urine out of your dragon-sized coltpussy
>With the way you were reciprocating on Cadence's freakish marecock, you were spraying your essence all over them
>Cadence then began tucking her knees, pressing into the incredibly soft pussyflesh of your mare, when she bumped into her huge, juicy clit above her yellow waterfall
>With a wicked idea, the Princess of Love began to stroke your mare's clit back and forth, spurning an erection that rivaled her old marecock
>And it was growing longer and thicker towards your own oversized clit with every stroke
>You learn forward and start jacking off your fleshy nub, grown so large you can barely get two hands around it
>By sheer force of will, your clit miraculously grows out to meet your mare's, fighting everything your psyche can take to resist orgasm for just a few more moments
>The instant the two mega-clits made contact was the spark that set it off

>Despite having a huge and cavernous vulva that could fit around a tractor trailer, the resulting orgasm reflexively clamped around Cadence's megacock tight
>The waters rose another 10 feet higher from all the femcum you gushed out from your ever-swelling coltpussy
>The perfect amount of heat, pressure, softness, and lubrication to make Cadence's leg-width urethra to bulge from her alicorn-sized cumshot
>But with her final stoke to push and hold you down onto her hilt, her flare lodged itself into the birthed unicorn's ass a split second before her flare bloomed outwards with the width of a large manhole cover; locking it in place
>A kiloliter of futa pony semen exploded in Rarity's rectum, like sitting on a fire hose
>She went from flat-stomached to full-term-pregnant-looking in just seconds, carressing the swell of her rapidly-fattening belly pressing against your uterus
>The surge was so strong it backed up her whole digestive tract and began to vomit out her pumped-in cum; not that she needed to breathe thanks to her long, thick umbili-cock circulating oxygen from your body into hers
>That didn't stop Cadence's minutes-long ejaculation to flow out from Rarity's mouth and inflate your womb to  an even greater size than now
>You mare, on the other hand, with enhanced sensitivity not-so-accustomed-to yet, finally bloated out to a size roughly equaling that of yours when her orgasm ended
>Both your gargantuan, inflated pussies effortlessly floated in the deepening pool, taking up most of the width the cavern's shaft would allow
>Cadence, with her orgasm at last tapering off, withdrew from your womb, extracting the unicorn inside you
>Rarity felt her connection to you tense and naturally snap off upon Cadence withdrawing her still-locked-in flare, and by extension, the cum-inflated unicorn out from your dilated cervix
>Most of the impossible swell of your belly receded as Rarity was being birthed out

>When the alicorn discovered the fashionista pony on the end of her mighty shaft, she found out that said pony was bearing a 10-foot long, 20-inch wide marecock, complete with fat, churning balls that reached to her ankles
>And she wasn't even hard
>When Rarity recovered from her previously-unbirthed stupor, coughing up a pint of residual alicorn semen, she saw that she was being surrounded by not one, but two impossibly fat, plush, inflatable boats of vulvae; idly floating in their own limitlessly-producing liquid excretions
>Rarity's marecock hardened in the blink of an eye, doubling its dimensions in arousal of witnessing you and your mare's two perfect, taut, smooth, over-inflated cunts
>Your mare's own was carelessly releasing a seemingly-infinite quantity of delicious-looking, perpetually warm, golden piss; sighing in satisfaction of her hyper-engorged size and the power to apparently gush out her bladder this way for what felt like forever
>With only a cry of desire, Rarity swam up and rammed her new mega-cock up your mare, knowing she was now big enough to properly please and worship that huge, squirting tera-pussy 
>Both of them gasped in unbridled pleasure when the unicorn felt her marecock plow through your mare's cervix and touch her far womb walls
>She opened her mouth to allow your mare's yellow stream into her throat, and drink herself to another round of forbidden pleasure
>Beneath you, Cadence is still hard, and mentions that she never did fuck and cum inside of you directly, and was curious about the taste of hyper-inflated cuntcolt renal extract
>After being careful not to cum the moment she put her giant marecock in, you felt Cadence start to give your urethra a rimjob
>You held out for as long as you could, letting her tongue toy with the insides of your pisstube before giving in and near-drowning her with your deluge of sweet urine

>Both futa mares gently and slowly eased their enormous marecocks in and out of your formidable vulvae, engorging their stomachs with your infinite-amounts of your delicious yellow nectar; letting any excess contribute to further filling up the cavern you all floated in
>While Rarity and your mare went at it, something clicked inside of Cadence's head
>She pulled out of you, belly sloshing with piss and held up the head of her marecock to your still-gushing urethra, and pressed her cumslit up to it
>Cadence haunched over in reflexive pleasure, both of you witnessing her dragon-sized marecock grow even bigger
>Her marecock elongated and thickened with your pee, sloshing and inflating her already-huge marecock longer and fatter than ever
>It was like enlarging a penis with a liquid injection, with its thick core snug inside a turgid, sensitive tube of your own extract
>She was growing herself in preparation to take your island of magical inflating coltpussy to its limits
>Once Cadence enlarged herself by an extra 15 to 20 feet, she popped off, dove underwater and crammed her piss-inflated horsecock up your snatch
>This time, you could REALLY feel her stretch your pussy out, spreading your ultra-bloated netherlips wide
>Even a fully-grown dragoness couldn't hope to fit a marecock of her dimensions all the way to the hilt
>You heard your mare crying in bliss about Rarity pissing in her womb
>Before you could process those words in your brain, the alicorn flooded your own womb with a warm liquid, less viscous than cum
>Their bellies shrunk as they voided, after metabolizing all that ingested urine into their own
>You were a marecock urinal too? 
>Why not?
>It felt SO GOOD to filled
>Filled with marecock, semen, piss, unbirthed ponies, it didn't matter
>With this god-like pussy, you could take in anything
>You were begging to crammed full with whatever this world of marecock had in store for you, because now you're built to take it

>Cadence began to feverishly hump your expanse of coltpussy, embracing and worshiping its softness, productivity, and sheer magnitude
>She'd make Shining Armor flood the Crystal Empire after transforming him the way you and your mare did
>Rarity and your mare obliged, acknowledging they loved to worship coltpussy as much as you worshiped marecock
>Their appreciation of your genital-inverted form made you squishing your inner walls tight around Cadence's foreskin
>In the corner of your eye, you saw your mare's belly distending into a globe with Rarity's cum; watching her turgid netherlips bloat out to completely encase the body of the unicorn
>Then you felt Cadence's flare bloomed to triple its width
>You had a feeling that you were gonna outsize her very soon
>With a soundless scream, you threw your head back, your pussy clamping down tight on Cadence's cock, then clenching rhythmically >Squeezing
>Kneading
>Milking
>Swallowing
>She could only take a few seconds of it, grunting deeply as her drunched nuts slapped tight to her body, bladder and testes emptying together
>Tens of gallons of milky yellow spunk blasting through her cock, wrenching your hole wide from the sheer girth of her inflated urethra
>She could see the force of it pushing against the inner walls of your womb, bulging your belly out with her cum alone
>Before the bloating caught up with it, ballooning you and your monster of a coltpussy fatter and fatter
>The explosive release of combined femcum and piss felt like you being drained of every drop in your body
>The sheer pleasure was enough to make you pass out

>When you awoke, you looked up at the light being shone above you
>You glanced above to see two familiar marecocks, a pink one and a blue one were dangling less than five feet above you through the trap door you entered the cave in
>Aloe and Lotus called out to you, asking if you wanted to be gotten out from their premium orgy pool/cave
>Wait, you were that close to the surface?
>Your orgasmic flood must've floated you to the top along with-
>You looked down to see your parade balloon of coltpussy was nearly scraping the walls of the cave shaft
>Shit-were they trapped under there?
>But then you noticed your mare, rubbing her nowhere-near-as-big-as-yours-but-still huge vulva underneath her clit;leaning against the smooth stone wall for support
>Looking around to your sides, you barely made out Cadence and Rarity's heads on each netherlip, massaging, nipping, groping, and humping its sensitive mass
>Their marecocks both penetrated your vaginal canal as deep as they could go in veneration of your humongous coltpussy
>Suddenly, their cocks poked into a hidden fold/tunnel on your interior pussy walls, and dove underneath the lake of piss and cum you all made 
>You felt that cryptic opening dilate as each of them wriggled their bodies inside, while your mare dove in and started climbing up your pussy to reach your womb
>The alicorn and unicorn dropped into a massive pocket filled with a magical, gelatinous matrix, feeling the texture of liquid though an rubbery outer of skin
>They were snuggled within your idolized pussylips themselves
>Their pythons of marecock fused themselves to your inner skin, feeling them pulsate and cum followed by a sense of fatigue and lacking the need to breathe
>Meanwhile, your mare had managed to crawl inside your inner chamber, just squeezing her inflated pussy lips inside when she felt a warm, throbbing tentacle attach to her clit and felt the same sensations throughout her oversized balloon-cunny
>The three mares decided to take a nap inside your body, sharing one another's vital energies while their umbilical cocks (and clit) breathed for them
>You told Aloe and Lotus that it could wait
>With a wave of tiredness crashing over you, you lie yourself and your hyper-distended belly back on your mammoth coltpussy, feeling the three mares purr within
>You could really get used to having a coltpussy

The End