You, the human, stood naked within the Royal Bedroom before your massive, snowy white horse wife Princess Celestia. She stood much taller than you. She must have been at least 12 feet tall or so. Her body was bulky and thick. She was basically a super-sized, heavy draught horse, even bigger than that of a shire horse. You could not meet her at eye level, you had to look up the long swan-like neck to reach her beautiful face. She stood a whole six feet taller over your six-foot-tall body.
“Anon, I need you to sleep with my personal student,” you nodded eagerly. ”However, I may have to temporarily reduce the size of your penis. I don’t want you to destroy her pussy. She’s a virgin.”
“Wait… what?” you replied, trying to take in both this request as well as her stated desire to shrink your man-meat down. You were really proud of your penis size. A mighty 20 inches of long and thick flesh rod. “But… why?” you asked your wife.
“Anon, your penis will destroy Twilight’s pussy. You are far too long and thick.”
“I will be gentle!” you protested. “Also… why do you want me to sleep with Twilight Sparkle?” you asked, trying to understand your beloved’s logic.
“She needs a nice stallion… err, human like you for her first time. Just promise me, if I keep your cock huge, be slow and gentle with her. You are not going to be able to fit in all the way inside her. She’s nowhere near as large as me.”
“Of course,” Celestia flashed her horn, adding an additional 10 inches to your cock. Your heavy cock bobbed up and down from the sudden growth. “Whoa!”
You took hold of your even larger cock with your right hand, partially at least. It was so thick you could not fully wrap your hand around it. “Seriously?! You go from worried about me destroying her pussy to making it so big I can’t even fit it into her?!”
“Why are you mad? I gave you an even bigger penis. You should be happy. I thought I could do something nice for you, but it seems I failed,” she said in a low sad voice, her head dropping down low, and her ears drooping sadly.
“I’m… I’m just confused, my love. That’s all. You go from wanting to shrink it down to be easier for Twilight to suddenly making it big enough to bludgeon someone with. Getting mixed messages here.”
“I can use pocket field magic to fit your monster cock inside her,” said the Princess, a bit snippy now in her attitude.
“Then… why the worries about the size?” you asked, still confused, holding your ungainly large cock like it was a football.
“Twilight might be scared seeing your massive cock.”
“Oh…. ok. That makes sense. If that’s what you were worried about, Celly, then if you still want to reduce its size, then go ahead,” you said, petting your pony wife through her mane in an attempt to calm her down and soothe her seemingly wounded pride. Her multi-colored hair felt warm to the touch, which blew in an unseen wind from behind her. A light tingling sensation coursed through your hand upon contact with her mane.
“Twilight wants her first time with a big stallion. So, I’m not sure of that either. We’ll just see how she reacts to seeing your cock before we make any other alterations.”
Celestia licked her lips, and looked down at you with bedroom eyes. “You want to warm up, and try your new cock on me?”
You simply nodded. With that Celestia turned around and showed you her massive backside. Her cheeks were monstrously large, each one about the size of a beach ball. The mare kneeled down a good bit, just so you could reach her huge ass. Her legs, after all, were tall and imposing.
You laid your hands upon her plump asscheeks, her two sun cutie marks dominated your vision upon the white cheeks of her ass. Your right hand came to rest upon her cutie mark. You could only touch one of her cutie marks at a time. Her cheeks were so wide, your left hand could not reach the other cutie mark upon her left asscheek.
Milk leaked out of her huge watermelon-sized crotch-tits from between her thick hind legs. Her marehood was soaking wet, it dripped thick and creamy liquid on the floor below, forming a puddle of her creamy essence. Her milk and marecum came to mix together below her, forming a creamy concoction.
The mare was just too tall to mount when standing up. You then heard a hum of a horn, you were lifted off your feet. You were slammed headfirst between her thick, upper asscheeks, her flowing tail covered much of your head, and your back and shoulders. Her plump donut-like ponut was in your face.
Down below, you could feel your cock kissing her hot marehood. Your cock was sandwiched between the thick cheeks of her buttcheeks, squeezing it with a wonderful heavy softness on both sides. Your hands were resting on either side of her plump cheeks, sinking deeply into her soft fat.
“Push forward, my love, and enter,” she said softly, her voice tickling along your ears despite the distance between you.
“As you wish, my darling Celestia,” you replied, as you started to push your obscenely large cock deeper and deeper into your wife’s quivering marehood. Celestia moaned, and even whinied a bit, kicking her back legs slightly to this welcome sensation. “MORE!! MORE!!!” she gasped out loud, pushing her ass into your body with increasing force.
Not only had she made your rod bigger and wider, but like ten times more sensitive. You were worried that you’d come inside her early without much effort on your part. The princess grit her teeth, groaning with pleasure as the massive ‘sausage’ plunged deeper and deeper inside. You were definitely stretching her out, and the big equestrian was loving it. Moans and mumbles escaped her mouth as the magical hum grew a bit more intense, applying pressure and force upon your body.
Celestia was trying to push you as deep as you could go, and soon your engorged penis was bumping up against the entrance to her cervix. This seemed to only energize the sexy big horse even more. “Fill me Anon! Fill me with your seed!!” she lustfully growled as the magical hold on you increased in strength. Without warning or build-up, she brought the full weight of her magic upon you… forcing you to penetrate her cervix with your mighty rod.
You yelped, then promptly groaned out as you came… HARD. Her vagina was flooded with your spunk, squirting out all over your lap-region. Gasping, all you could do was rest up against her massive soft squishy ass as you basked in the afterglow… before you felt an odd sensation.
Was… was Celestia’s ass getting… bigger? You found yourself being pushed upward as her rump air ballooned upward, and your still hard cock began to fill her less and less. You heard a loud crash, shortly followed by dust and debris falling from the ceiling. The gap between her buttcheeks became significantly wider and you subsequently fell between her cheeks. Celestia’s growing buttcheeks came to ensnare your body on both sides, squeezing your body on both sides with their wonderful, heavy softness.
Celestia craned her neck back and embraced the growth, her horn glowing with blinding light to amplify her growth even further. The walls and the ceiling expanded away from her, allowing her to grow to her heart’s content.
With magical aid, you could see Celestia’s ass air ballooning out from behind her. You stood before her thick and meaty marehood, which was soaking your face with gallons of thick and creamy marecumm, which came gushing out of her. You laid your head down and began to lick the right side of her plump marehood. You could see the lips of her vagina rapidly inflating before your face. The chasm that was her asscheeks grew ever wider, the light from outside began to fade away as you were lost into the abyss that was Celestia’s growing asscheeks.
Your love for Celestia caused her to grow even faster. Her rump cartoonishly bloated out from behind her like an avalanche. During her growth, Celestia shook her rump from side to side, this created loud meaty slapping sounds as her monstrously large buttcheeks smacked against each other. In the gloom between Celestia’s asscheeks, you could hear the echoing clap of her buttcheeks.
Licking her lips, Celestia placed her hoof upon her buttcheek. Her hoof sank into the heavy squishy softness of her bloating rear, it created a deep depression like that of an asteroid crater upon her cheek. Her hoof sank ever deeper into her plush ass, it showed no sign of stopping its growth.
Grow…. Grow… grow the snowy white alicorn went. Her body rose further and further into the air. Her cheeks jiggled about like a stormy ocean as new layers of fat pumped into her ass. When Celestia’s growth finally came to a stop she stood about 30 feet tall.
Celestia’s buttcheeks were bigger than ever before. If you had a guess, they were about the size of a British double-decker bus at the very least. Her bulky, thick legs were like that of silo containers at a milk factory. Even your cock at this larger size was nowhere near large enough for this behemoth mare. Her two huge crotch-boobs were about the size of hot air balloons. Her thick and creamy milk leaked out of her boobs onto the floor below.
Just then the purple unicorn Twilight came into the bedroom. She brought a hoof to her mouth and gasped in shock at the sight of the enormous Princess Celestia. Twilight stood at a cute, four and a half feet tall or so.
“Celestia… how did you get so big?”
Celestia giggled. “Hehe. Anon. He’s between my asscheeks,” she said in a joyful tone.
With a flash from her horn, she teleported you before Twilight. Your entire body was soaking wet with Celestia’s thick and creamy marecum.
“Hey there,” you said, giving her a wave.
Twilight sat down on her rump before you, fidgeting with her two front hooves as she stared at your huge cock standing tall and proud between your legs. “Oh, Hello Anon,” she said in a low voice. “I-I… heard you were big… but not that big.”
“Blame Celestia. She made my cock even bigger,” you said, scratching the back of your neck.
Twilight reached up with her soft, spongy feeling right hoof to take hold of your thick cock, partially at least. Your cock was too thick for her to fully wrap her hoof around. “I didn’t say it was bad,” she said softly.
You open your mouth to speak but were cut off when the tip of your fat cock came to be softly kissed by her, this was accompanied by a well-defined smooching sound. You gasped, your legs jerking from the sudden feel of her lovely muzzle kissing your cock. Twilight pulled her head back and giggled happily in reaction.
“Let me make things more comfortable for you,” said Princess Celestia as she laid herself down on the floor, presenting her absolutely enormous backside to the two of you. “Feel free to use my ass like a bed.”
Twilight let go of your cock. You made to walk over, and to climb up Celestia’s right asscheek. You laid yourself down upon her huge, yellow sun cutie mark. Your body sank deeply into the thick layers of soft fat. Her rump was the softest, warmest bed you ever felt to lay upon.
You were soon joined by Twilight, who laid herself down on top of you. Her additional weight caused you to sink even deeper into Celestia's ass below. The soft, warm cheeks of Twilight’s rump came to rest against your cock, hot-dogging them. Her two front, soft, spongy feeling hooves came to rest upon your shoulders. The mare smiled nervously and turned her head away to the side to look at Celestia’s other cheek.
“Am I sexy to you, Anon?” she asked in a worried tone. “My ass is nowhere near as big as Celestia’s.”
You raised your hands up and took a tight grip around her cutie marks. Your hands sank into the plush softness of her plump asscheeks. The mare made a sound like a dog’s chew toy in happiness.
“Twilight, I love all pony butts. Big and small,” you said softly.
Twilight turned to face you. You could see her lower lip quivering, and tears of joy came to fall down her cheeks. “Do you really mean it?” she said in a low voice.
“Yes, Twilight. I meant it,” you said, giving her fat rump a tender rubbing with both of your hands.
Twilight leaned her head down and brought her lips to yours. Her large equine tongue came to enter your mouth. Immediately, she swirled her tongue wildly about within yours. Your far smaller, human tongue could only lick the underside of her tongue for the most part. She tasted minty fresh, with a hint of lavender.
You and Twilight kissed for what seemed like forever before you finally pulled apart. A bridge of both of your saliva connected your departing lips. The mare hoisted herself up high over you. In doing so, her ass left your lap, and her hooves departed your shoulders. Once high enough, she brought her soaking wet marehood to the bloated tip of your massive, 30-inch long cock.
The mare smiled nervously, as she stared at the massive cock about to enter her tight pussy. “Uhhh… go easy on me?” she giggled, anxious. “It’s my first time.”
“Of course Twilight. You can be in command while on top.”
“Celestia has been teaching me pocket dimension spells lately. I see why I needed them,” the mare took a deep breath, and lit up her horn with magical power. “Okay, here goes.”
“Are we still sure about if we can use this... to… well… to this extent?” you asked, still not wrapping your mind around how this could work. But all the two Equestrians did was smirk and give each other knowing glances.
The purple mare took the plunge and took your huge thick tip into her tight pussy. The mare uttered a loud neigh as your cock slipped into her impossibly tight marehood. She closed her eyes tightly as tears began to fall down her cheeks. Her marehood frantically squeezed down hard upon the massive invader inside her, making you groan in bliss.
“Neeiigghh!” she cried out with a neigh. The protective part of you was about to put a stop to this, worried perhaps that the pocket dimensional magics were taking too long to kick in, but Twilight put a hoof on your chest. She gave you a warm smile.
“It’s… it’s ok...” she whispered between gasps.
Inch by inch, she slowly sank down upon your massive cock at a snail’s pace. Once she was low enough the mare leaned her head onto your shoulder and uttered a muffled scream she seemed to be holding in. You could feel her tears soaking your shoulder. The mare’s whole body was shaking uncontrollably. You brought your right hand upon her mane, and began to lovingly pet her to try to soothe her pain. Your left hand came to rest upon her cutie mark.
Lower, and lower she went until she took you to the very bottom. Your massive dick was impossibly deep inside her marehood. To prove the point even further, your cock grew even larger inside her. Your cock quickly rose up yet another 10 inches, making your cock now 40 inches long inside her, and even thicker again.
Twilight uttered muffled screams into your shoulder at the feel of your even bigger cock now inside her. “I’m sorry Twilight. I forgot Celestia had magically enhanced my cock to grow bigger when it is inside a virgin. Something about making it extra special for them or something.”
Blushing, the purple mare gave a glare towards Celestia, groaning and moaning as she panted. Their ‘bed’ giggled in response, sending ripples through her immense ass.
“Oh Twilight, his cock comes with a pocket dimension when it detects it is inside a virgin. Do you not like it?”
Twilight lifted her head up slightly to show you her badly bloodshot eyes. “I-I…. yes. I like it. But--... it’s so…. So… so painful.”
“Good. Because it’s not done yet.” came Celestia’s chipper voice.
“Wait? What?” whimpered her student.
She cried out a loud whinny, as her walls were pushed even further apart as your cock once again swelled in size. Your cock pushed even more impossibly deeper inside her, slamming against her cervix. Her marehood clamped down hard upon your expanding girth.
“I’m sorry, Twilight,” you said in a low voice, feeling guilty about the pain you were causing her.
In response, Twilight kissed your shoulder even as she uttered muffled screams of pain. Longer and longer, thicker and thicker your cock came until it finally came to a stop about 60 inches long inside her. You had just grown another 20 inches inside the mare.
Twilight’s whole body was shaking erratically, her tears soaking your shoulder. Her marehood was convulsing around your monstrously thick cock deep inside her.
You laid there for quite some time. You could not bear to thrust into Twilight in such a state. You allowed the mare all the time she needed. Eventually, the mare calmed down and lifted her head to look upon you. Your heart melted at the sight. Her lower lip was quivering, and you could see that her eyes were badly bloodshot from her tears.
You brought your right hand to her mane, and you subsequently began to pet the distraught mare. Her hair felt silky soft as it slid through your fingers. At the same time, your other hand came to rest upon her left cutie mark. Your left hand sank deep into the plush softness of her cheek. With loving tenderness, you stroked her asscheek with your other hand, feeling up the warm softness of her asscheek. It melded to your touch like memory foam.
Twilight cooed happily as a smile came upon her face while you tenderly pet her, and rubbed her asscheek. She brought her right hoof to her face, wiped away her tears, before placing it back down again on your shoulder.
Subsequently, Twilight began to lightly bounce her ass up and down your lap. You in turn gently thrust upward, meeting her in time with her bounces on your lap. Your cock came to plunge deep into her depths each time she bounced on top of you. The mare moaned happily as your balls repeatedly smacked against her backside.
You withdrew your right hand from her mane, and laid it down upon her right asscheek, joining alongside the other one from the other side. Your hand sank into the thick, bubbly softness of her cheek. With both hands, you began to worship Twilight’s succulent cheeks, feeling up her wonderful plush softness.
You didn't notice it at first but Twilight was slowly beginning to rise into the air, centimeter by centimeter. Her bounces on your lap just became a little bit heavier as time went on. Your hands upon her rear began to sink slowly deeper and deeper into her inflating rump.
You roamed your hands across her rump, feeling up her wonderful softness, admiring her bubbly softness as her lovely butt swelled bigger and bigger in your grasp. Twilight leaned down and kissed you passionately, uttering muffled moans as she slowly grew on top of you. Her large equine tongue came into your mouth, and began to swirl about, dominating your far smaller human tongue.
You delivered a hard slap upon Twilight’s right asscheek as it bounced on top of you. There came a loud meaty slapping sound as her cheek smacked against the other one. At the same time, your cock throbbed harder inside her, growing several more inches inside her, making Twilight utter a muffled whinny into your mouth.
Your hands began to slowly sink ever deeper into her ass. Twilight’s elongating tongue came to push further and further down your throat, causing you to choke and cough. In reaction, the mare lifted her head up to fix the issue.
You hissed in pain, Twilight’s buttcheeks now felt like two heavy bags of potatoes slamming up and down your lap. And they only became heavier and heavier as time went on.
Twilight came to match your height, but showed no sign of stopping her growth. The six foot tall mare kept growing ever further into the air. Your hands found it increasingly difficult to hold onto her air ballooning ass. You were slowly, but surely losing your grip on her cheeks. Twilight grinned down at you she kept getting bigger and bigger, heavier and heavier, fatter and fatter, thicker and thicker.
You could barely hold onto her massive ass now. It just kept getting bigger and bigger in your grasp. You struggled to hold onto her ass, your hands ending up sinking like a waterbed mattress into the plush softness of her cheeks.
As Twilight assumed 7 feet over you, your hands came to slip onto her breathtakingly thick thighs, but even they were a struggle to hold onto. Her crotch-tits weren’t helping either, starting to slowly inflate… pushing you two further apart with each new swelling in size. Milk began to dribble and leak from her nipples, soon drenching your lap and stomach. The virgin pony moaned and mewled as she grew more and more, your monster cock soon no longer taking up so much ungodly room within her nether-regions.
Celestia was panting heavily, watching this all transpire. She loved watching you take her favorite student’s virginity. It took all of the Sunbringer’s power and discipline to not shove a hoof into her massively wet snatch. Mostly out of a fear of disrupting the show before her, atop her magnificent ass.
Loud meaty slapping sounds could be heard from Twilight’s massive growing backside hitting your lap, and Celestia’s asscheek below. Twilight's growth rate seemed to be increasing the bigger she got. She now was about 8 feet tall. The mare was now gaining about an inch per second, rather than a centimeter.
Twilight for her part was moaning aloud and uttering loud whinnies of pure bliss. The unicorn was both sexually stimulated by your massive cock inside her and her continuous growth. “Mmmmmm! Yes! Yes! Yes!” she cried out.
The noise of her buttcheeks slapping against your lap and Celestia’s asscheek below increased in volume the bigger she got. Her massive, beach-ball-like big bubbly purple ass was a blur of motion as she rapidly bounced up and down upon you. You were a quivering mess under the massive, and growing mare, your whole body was shaking erratically. You were both moaning and hissing in pain from the heavy slams of her massive backside hitting your lap each time she bounced on top of you.
“Mmmm! Yes! Take my big fat rump!” she cried out.
You struggled with all your might to hold on to her expanding thighs but it soon became impossible. Your hands slipped away from her thighs and came to land upon her furry chest. With love and affection you began to rub her chest causing the mare to moan happily. Her air ballooning rump began to cover your torso. In no time at all your entire body was covered with Twilight's ass covering it. You uttered a muffled moan into Twilight right asscheek covering your face. You were trapped in darkness under her ass.
With magical aid you were given a perfect view of Twilight’s rump air ballooning out from behind her. You could see her ass jiggling about like a stormy ocean as more and more fat was pumped into it. Her massive, thick asscheeks clapped together with loud meaty slapping sounds each time she bounced on top of you.
Twilight's body in general was massive at this point. She was about the size of a full-blown african elephant bouncing on top of you. Her godlike asscheeks were like that of enormous beach balls each. And yet, she was still growing.
You felt your cock twitch, you were near the point of release. Tears of joy fell down your cheeks in anticipation of seeing Twilight having a massive growth spurt from your cum.
With a muffled cry, muffled in that you were face-deep in her massive crotchboobs, you exploded in orgasm. Filling up your virginal pony to her limits as seed and ejaculate seeped out onto your lap. The walls and ceiling of the room expanded hundreds, if not thousands of miles away. Celestia gasped in shock, and her eyes widened in alarm.
The rest happened a little fast, but when your brain caught up… you find yourself nestled comfortably between the epic-crotch-breasts of the purple pony. As the mare on top of you went practically supernova in growth. Gasping, you tried to look for your beloved wife, the two of you having become separated in the calamitous chaos of a massive growing pony. For a second you feared that Celestia had been crushed beneath the spontaneous ‘ass-plosion’ that had occurred.
“Did you forget, my love, that I’m practically a divine being?” came a voice in your head, giggling at the concern she felt coming from you.
“How big is she?” you asked in your thoughts, curious to see how large Twilight had gotten. Because all you could see was endless furry breast-flesh, the sloshing of her tits strangely soothing. To this your wife giggled.
You were then shown an image as if Twilight was outside this room. She looked like she was the size of the continent of Asia back home… maybe with some of Europe added in as well. If Twilight were outside, right now… she would cover all of Equestria. Her breasts alone dwarfed the highest mountains. And that doesn’t even begin to describe how big her ass was. Her cheeks spread out hundreds of miles out to sea, they nearly reached Griffon Stone in the South East. Her head was above the clouds, and out into space even while sitting down. Luckily, she was contained in this room. Not to mention… her massive tits were spewing out milk, flooding the room, creating a sea of her own.
You gasped in shock at the sight of huge, feathery wings appearing upon her back. It appeared she became an alicorn. You could now see Celestia, she was like a tiny ant smothered by her right cutie mark against her huge asscheek.
“I’m… I’m an alicorn now?” said Twilight in awe, looking back at her feathery wings upon her back.
Celestia chimed in. “I still expect you to do your friendship studies. If the world is in danger, I want you to be empowered even further.”
Twilight gasped in shock. “You think I would get bored of studying? Of course not! Just because I’m an alicorn it does not mean my friendship lessons are over. Besides, I want an even bigger ass.”
“That’s my student. I too would love to see your ass bigger.”
With her now being an alicorn, Twilight seemed to be undergoing some after growth, her asscheeks were air ballooning out from behind her, slowly getting bigger and bigger. Her asscheeks came to clap together, creating loud meaty slapping sounds of flesh, slapping against flesh. Her cheeks jiggled about like a stormy ocean as more and more layers of fat pumped into her ass.
You were smothered between her tits, you could feel them swell even larger by the second. The sight of which broke you down, you found yourself crying, your tears landing on her tits. Your tears was like throwing more fuel onto the fire, because she was hit with small growth explosions each time your tears landed on her.
Celestia flashed her horn, and she subsequently exploded in size. You were quite blindsided by this turn of events, though you figured it shouldn’t have been so… strange… given your wife’s power and abilities. Size manipulation shouldn’t be too out of her wheelhouse.
Celestia and Twilight were now face to face, matching each other in about equal in size. The two huge mares smiled at one another. Celestia reached her hooves back, and took a tight grip around Twilight’s monstrously large asscheeks. Like huge gaping asteroid craters, her hooves sank into the squishy softness of her rump, creating deep depressions.
“Love the cushions,” giggled Celestia
Twilight craned her neck back and uttered a loud moan as she flashed her horn. “Well if you like them now, how about...” she gasped out loud. With a burst of magic, she augmented her size even further. Celestia with tears in her eyes watched Twilight’s rump swell larger, blasting upward with a huge growth spurt.
Celestia’s hooves could now barely hold onto Twilight’s massive asscheeks. Even now, she was still growing, her rump slowly inflating higher and higher into the air. Celestia’s hooves began to sink even deeper into her expanding rear.
“More like a sofa now, wouldn’t you say?” giggled the newly-minted alicorn.
“Two can play at that game,” Celestia flashed her horn, rising up to match Twilight’s height. She could now easily hold onto Twilight’s asscheeks with her hooves. The two mares were now about two times larger than the continent of Equestria.
Twilight gasped in shock. “Oh, you are being so rude. Celestia, I wanted to be the bigger one for once.”
“Well, I am Sunbutt. Nopony is allowed to be bigger than me. Love and embrace me, and accept that I will always be bigger,” said Celestia, as the two godly bodies glared into each other’s eyes in a stand-off.
Then they both erupted in giggles and laughter.
You spoke up in a worried tone. “Please don’t fight each other. I love you both.” The two mares swelled larger with massive growth spurt from your loving words.
“Relax my love!” cooed Celestia, using her magic to pluck you out from between Twilight’s glorious breasts, eliciting an excited whimper from her student. The two alicorns beamed with pride and warmth as they watched you float up to their faces. As soon as you were within reach, the duo began to smother you in gentle but affectionate kisses. Their massive mouths kissing your small body between them.
“Yeah Anon! We’re just being silly! I want to see Celestia’s ass get bigger myself,” chuckled Twilight as her massive lips smacked against your body.
Celestia giggled. “And I will be happy to see your ass try to beat mine in battle. After I've defeated you, we should shrink back down to normal size and try to have some vanilla sex with my husband together with no growth.”
