Runneth Over

Peering out over the packed stadium, Cadance smiled broadly. While she hadn’t needed to attend the graduation ceremony for the newest batch of Royal Guard recruits, she saw no reason not to - especially because she was alongside her lovers and one of their most cherished friends. She turned her head to her left and right, peeking over at Celestia and Shining respectively, before glancing over her.

“What?” Rarity softly inquired.

“Nothing,” Cadance hummed, “I’m just glad that you decided to join us.”

Reaching out and caressing her shoulder, Rarity grinned. “Why would I not? It’s not every day that I get to pay a visit to the Crystal Empire and enjoy such regal company.”

Celestia dismissively waved a hand and shifted in her seat - a seat which creaked in protest beneath her. “As if Twilight doesn’t count.”

“Darling, you know as well as I do that I don’t see her like that - granted, she’s as much of a Princess as either of you, but you two held your crowns long before she did. Twilight was a friend before she became royalty, unlike yourselves,” Rarity giggled, reaching out and rubbing the alicorns’ shoulders.

Giving a deep, contented sigh, Cadance closed her eyes and shook her head. Other than being a fantastic friend, Rarity was an invaluable asset - doubly so as of late. Now more than half-way through their pregnancies, Celestia and herself would have been in dire straits without the couture’s expertise. While an outside observer may have just seen a pair of well-dressed Princesses sitting and enjoying the ceremonies alongside Prince Shining Armor, the reality was a bit more complicated.

Through a masterful combination of spellwork and enchanted materials, Rarity had done the unthinkable - she’d crafted garments that not only allowed her to function, being able to out and about like any normal mare, but she appeared to be a fraction of her actual size. The truth of the matter, despite her look in public, was that she’d grown by an order of magnitude. Her bust, belly, and backside were all much, much larger than they’d been when she’d been carrying Flurry or Aegis - so much so that, without the use of her ensorceled garments and magic, she’d be practically immobile.

She turned her head and looked back at their esteemed guest as her thoughts wandered. Rarity wasn’t pregnant, nor had she expressed any interest in having a foal herself, yet her time with her and Celestia had taken a toll on her. It had come as a pleasant surprise to find out that the seamstress had more than simply an appreciation of full-figured, expectant mares, and she’d been more than happy to indulge her. Regular fittings and routine refinement of the charms on her wardrobe meant she was seeing the skillful unicorn more often than ever.

“Care for some refreshments, Rarity?” she purred, running one hand over her bosom.

Rarity straightened in her seat and instantly looked away. “I’m q…quite alright, dear!”

Relenting if only for the time being, Cadance bit back a chuckle. It was hard for her to tell if Celestia had been telling the truth, claiming that Rarity had accosted her and fervently nursed on her nearly two months ago, but what actually had happened was of little consequence. At the end of the day, regardless of what may or may not have transpired within the Carousel Boutique, she had a quite eager volunteer to help drain milk from her prodigious breasts.

“You mares play nice,” Shining noted, casting a knowing glance between the trio of mares.

“No promises,” Celestia countered as she shamelessly leaned across Cadance’s lap to stroke his inner thigh.

It wasn’t the fact that Celestia was brazenly pawing at her husband that annoyed her - it was that she hadn’t struck first. Her ravenous appetite, expansive figure, and the need to wear spellbound clothing to do much of anything could all be annoying at times, but her hormones - heavens be, her hormones were like a rollercoaster! Pushing her fellow Princess away, if only out of a bit of spite, she folded her arms over her chest and pouted.

“Come on,” he sighed. “Don’t make me sit between you three…”

“As if you wouldn’t enjoy that,” Celestia giggled.

Cadance went to reply, to defend Shining’s honor, but she remained quiet. She knew better than anypony that having a healthy, virile stud sandwiched between herself and Celestia would be disastrous. It was hard enough for her to control herself around him, so adding a competitive element to the mix, on some subconscious level vying for his affection, magnified her already heightened libido.

“Well it certainly wouldn’t bother me at all,” Rarity chimed in, drawing the trio’s attention. “I’m not sure how much I’d be permitted to help with, but spectating would -”

“Not helping, Rarity,” Cadance grumbled.

Extending her arm to one side, barely aware of what she was doing, she rubbed Shining’s upper leg to assert herself. She loved Celestia as both a mentor and a partner, although she was his wife - yes, they’d discussed a wedding that would include all three of them at some point, but she was going to wield her marital status for as long as she was able. As her fingers graced the imprint of his stallionhood, a thrilled shiver shot through her.

Nopony could explain it, not even Twilight with her extensive knowledge of the arcane, but something was going on with Shining. The white in his mane and beard had all but disappeared, he’d inexplicably grown nearly a foot in height, and his stallionhood - mother of mercy, his stallionhood was more impressive than it had ever been! She’d initially thought she was losing her marbles, that it would be impossible for her hubby’s endowment to have gotten substantially larger, yet the repeated measurements she’d taken didn’t lie - his cock had become monstrous.

Pushing himself up and gently pushing her hand away, likely knowing what direction things were taking, Shining straightened his uniform. “I’m going to use the little colt’s room. Do any of you fine mares want anything ~ a drink or snack maybe?”

“I’m quite fine, but I do appreciate the offer,” Rarity replied.

Celestia shook her head. “Nothing for me.”

“Same,” Cadance noted.

After the incredible rutting that morning, followed by the banquet she’d had for breakfast, there wasn’t much she wanted - of course, that would change in a few hours, although that was an issue she’d tackle when the time came. Waving to him as he departed, she turned her eyes back to the field. While she couldn’t say exactly what the remainder of their day would entail, after the graduation was finished, was certain that it would end the way most others did.

Nearly every night before going to bed, Shining would tend to her marish needs. Some evenings, she’d get rutted into a stupor, cumming so hard and so frequently that she was unable to stand - others, she’d play with herself while assisting him and Celestia. Regardless of how things played out in their bedchamber, she always - always drifted off gratified in every conceivable way.

As she turned her nose up and sniffed the air, the corners of Celestia’s lips turned up. “Somepony’s excited.”

“Says the mare who’s probably drenched her panties at this point,” Cadance huffed.

Celestia leaned in and brought her muzzle to Cadance’s ear. “You know, being up here and away from the crowd, nopony would notice if things got a bit steamy.”

Merely hearing the sinful proposal was enough to make Cadance’s marehood seize upon itself. They were in a private box situated high above the grounds, and the chances of anypony seeing what they were doing were slim, but they couldn’t just spontaneously help themselves to some hanky-panky in a colosseum ~ could they? Reining in the slavering, uncontrollable beast that was her lust, she drew a deep breath through her nose, slowly exhaled through her mouth, and centered herself.

“I…I wouldn’t mind - I m…mean, don’t hold yourselves back on my account,” Rarity stammered.

Shifting in her chair, Cadance leered back at Rarity. She wouldn’t be shocked if her friend eventually became involved with their amorous affairs, with the way things had been going lately, but this was neither the time nor place for such things. As quickly as it had appeared, her irritation faded.

“Rarity,” she softly began, “if you’d like to join us, you could simply ask…”

Celestia rolled her head back and drew her hands over her face. “I’ve been telling her that for at least a month…”

Put on the spot, Rarity fidgeted uncomfortably while holding a hand to her chest. “It’s hardly my fault! With as big and beauteous as you are, not to mention your status as Princess, it’s to be expected that mares like yourselves are assertive. A mere commoner, like myself, could hardly ask two alicorns and their charming Prince to participate in any of their passionate activities.”

“Uh-huh…” Cadance grunted, wholly unconvinced by the humble act. “You do remember that you’re one of the Elements of Harmony and friends with every Princess in Equestria ~ right?”

“Plus I heard she’s fooled around with Twilight,” Celestia nonchalantly added.

Rarity froze as cold beads of sweat formed on her brow. “I…I haven’t the s…slightest idea what y…you’re talking about. Twilight and I w…would never -”

“Would never get frisky during a sleepover with Applejack?” Celestia interrupted. “Do bear in mind that Twilight was writing to me on a near-daily basis after she moved to Ponyville, and some of her messages were, shall we say, a bit suspect…”

“Wait,” Cadance croaked, taken aback by the revelation. “Rarity, is that true?”

She’d long suspected that the Elements of Harmony, all six of them, may have been more than just friends, but this was the first evidence she’d ever heard to give it any real weight. There’d been times when the sextet would act a bit too close, namely between Rainbow Dash and Applejack, and she couldn’t help but think that there was something going on between them - after all, as far as she knew, none of them were in relationships. Waiting patiently for a reply, she watched as Rarity began to squirm.

“W…well,” Rarity gulped, rubbing the back of her neck while her face went beet red, “I’d hardly say there was a…anything particularly frisky about…”

As much as Cadance would have relished the impromptu inquisition, she knew when to hit the breaks. Teasing a friend was all well and good, but there was a fine line between having fun and making somepony genuinely uncomfortable. Extending an arm and patting the flustered unicorn’s knee, she smiled.

“How about this,” she murmured, “if you ever find the courage to talk to Celestia, Shining, and myself about a sleepover at our castle, I love to hear about…”

She fell silent and started when an odd sensation struck her - specifically her unmentionables. It wasn’t a secret that she’d gotten a bit worked up, with her nipples being hard enough to be seen through her top and her bouquet strong enough to be detected by Celestia, although that wouldn’t explain what had just happened. Twisting in place, she peaked a brow down at her groin.

“Is something the matter?” Rarity asked.

Cadance slowly shook her head, genuinely unsure. “I’m…I’m fine…”

It was over as quickly as it had started, although she could have sworn she felt something brush against her marehood. Considering that there was nothing in her chair, and that there wasn’t anypony around to slip anything up her dress, she must have been imagining things. Shaken from her thoughts by the sound of applause, she turned her attention back to the throng and the rows of impending graduates.

Following her gaze, Celestia nodded to an armored figure waxing poetic about the duty of the Royal Guard. “I’m a bit surprised that Flash Magnus is so long-winded…”

“Well I certainly am not,” Rarity tutted. “When he came to speak at the School of Friendship, he went on and on for ages! If Twilight hadn’t intervened and politely told him to wrap things up…”

Cadance barely paid the banter any mind - not because she wasn’t interested, but because shortly after Rarity started talking, she felt it again - something softly nudging her marish bits. Though she was tempted to lean back and thrust a hand into her panties, doing so wouldn’t necessarily do her any favors - in fact, it was probably the worst thing she could do. Any act to touch her loins, whether it was warranted or not, would guarantee a sound ribbing from Celestia and possibly from Rarity as well, so she bided her time and considered her options.

Wondering if Celestia or possibly even Shining had slipped something into her underwear, she bolted to her feet. Whatever the heck was touching her had stopped simply rubbing her marehood and was doing its darndest to sink into her. While she turned in place and pawed at herself, thrusting one hand to her groin and the other to her tush, her anxiety went through the roof.

Standing up, Celestia placed a comforting hand on her arm. “Ants in your pants?”

“There’s something…” The words died in Cadance’s throat when she looked over.

She’d assumed Celestia was worried about her, but the look on the older mare’s face smacked of something all the more concerning. As she glanced over to Rarity and was greeted by a similar expression, a cold knot formed in her stomach. Her friends, two mares she trusted more than almost anypony in the whole wide world, appeared anything but anxious about her inexplicable plight - no, it seemed like they were on the verge of laughter.

Rarity rested her chin on her hands as she leaned forward. “What’s wrong, dear? You seem a little tense.”

Willing herself to ignore the thing, whatever the hay it was, that was prodding her entrance, Cadance scowled. “What did you do?”

Celestia reeled back and clutched her bosom. “Whatever do you mean, Cadance? Neither Rarity nor myself would ever do anything to harm you!”

“Quite right,” Rarity chirped.

“That’s a load of horse apples and yoooooooo - Oh buck!” Cadance groaned as her marehood was forced open.

With her knees buckling and heart racing, she stumbled to one side and grabbed the booth’s guardrail to support herself. What in the heck was going on?! She could understand if somepony had surreptitiously hidden a vibrating egg in her panties, even if she didn’t know how they could do it without her noticing it, but she was dealing with something far larger than a simple toy. Involuntarily contracting around what she swore was the broad head of a stallionhood, she sucked air through her clenched teeth and trembled.

“Looks like she’s struggling a bit,” Rarity remarked.

“I’m sure she’ll be fine ~” Celestia snickered, “won’t you, Cadance.”

Cadance fought through the strangely pleasant sensations accosting her and squinted over at the pair. It was as plain as day that Celestia and Rarity were at the very least aware of whatever was going on with her, if not directly responsible themselves, although that gave her no hints as to what was happening. Inadvertently glancing down at the crowd, she noticed several paces peering up at her in curiosity.

This was bad - really, really bad. The obvious solution would be to run off to the mares’ room, strip down, and figure out what was sinking into her depths, but that wasn’t exactly possible. Given that her dress was the only thing keeping her inordinately full figure in check, getting undressed wasn’t something she could easily do - plus she was pretty sure there wasn’t a restroom stall in the building that could accommodate her immense, unrestrained girth! As the mysterious intruder sank deeper and ground against her g-spot, she groaned then immediately clamped a hand over her muzzle.

While she didn’t understand what was happening, she knew one thing for certain - it was far more enjoyable than she dared to admit. To say she was troubled by the unforeseen and lecherous development would be an understatement - nevertheless, her body reacted to the sudden and quite passionate intrusion in an altogether different light. Winking and leaking nectar down her inner thigh, she impulsively bucked her hips.

“What,” she hissed, whipping her head around when Celestia’s hand glided up to her shoulder.

Grinning from ear to ear, Celestia leaned in. “Just relax…”

“How can you tell me to relax when - wait,” Cadance croaked.

It wasn’t something gradually filling her, it was somepony. For as long as she’d been with Shining Armor, having dated him for years before making it official and tying the knot with him, she was intimately familiar with everything about him - bearing that in mind, after calming herself enough to focus on it for a moment, she could recognize his stallionhood from feeling alone. She wanted to be angry with her husband and the pair of conniving mares who obviously had some hand in her lecherous harassment, yet the onslaught of pleasure, yet the bolts of pleasure coursing through her made it all but impossible to be upset.

Shining’s endowment was a gift, the type of stallionhood that inspired poets and sculptors, and its every minute detail had been all but literally plowed into her mind. With a subtle upward curve, an angry vein that ran along one side, and a slight taper that she’d unwittingly committed to memory, her hubby’s cock had seemingly been made to hit every sensitive area in her depths. Tightly squeezing the base of his shaft, she falteringly exhaled and tried not to draw any attention to herself.

Making a scene was the last thing in the world she needed. With a pair of Royal Guards stationed just outside their box, only a few dozen feet away, and hundreds of ponies in attendance for the graduation, the circumstances were precarious at best and possibly catastrophic at worst. While the chances were relatively slim that anypony would pay her any mind, getting too loud, stumbling off to a bathroom, or teleporting away from the ceremony without a darn good excuse would raise questions and make her look bad.

“You’re - Nnnnph - an ass,” she growled, glancing between Celestia and Rarity.

“Don’t be so prudish, darling,” Rarity tittered. “I’m sure that if you were given the chance, you’d do the same thing to Celestia.”

Celestia nodded as she eased herself back down and gestured to Shining’s chair. “I’m sure she would. Rarity, feel free to keep Shining’s seat warm until he gets back.”

“With pleasure!” Rarity sang, standing and hopping into open chair just behind and to the right of Cadance.

“And you,” Celestia continued, sending power into her horn, “why not make yourself comfortable…”

Lifted and pulled back into her seat, Cadance fought to contain herself. Even though Shining hadn’t fully hilted himself, plunging into her at a snail’s pace, the sensation of fullness

Though it was a relief to understand what was happening, she still couldn’t wrap her head around how it was happening - as such, she took the only reasonable course of action.

“M…magic - Buck - dildo?” she wheezed, looking over to Celestia’s smug face.

“Nope,” Celestia hummed. “It’s actually your husband.”

Cadance gasped and shuddered when the fat tip of stallionhood pressed against her womb. “H…how?”

“Portals,” Rarity glibly stated. “For the past month or so, I’ve been working with Celestia to construct a very special pair of panties that would allow her to service Shining when they were separated - granted, I hadn’t intended to use them as a prank, and I was going to surprise you with a pair for yourself, but the notion of this little trial run was simply too perfect to pass up! I do hope you’re not cross with us…”

“It’s fine,” Cadance breathed through gritted teeth.

It was, in fact, anything but fine, but she wasn’t going to proclaim she’d reap vengeance on either of them. Heaving air into her chest, she gripped the sides of her seat while trying and failing cataclysmically to gather her thoughts. She had to presume Shining was hiding away somewhere, quite possibly in a bathroom stall, languidly plowing a sex toy that was linked to per panties, although where he was and what he was using hardly mattered at this point - what did matter was that her bestial urges were steadily eclipsing her higher functions.

Of all the treachery she was suffering, from Rarity and Celestia flanking her and watching her endure her sensual torture to her husband off rutting her at a distance, her body’s betrayal was by far the most annoying. Though she consciously knew she should leave, she simply couldn’t. Rocking her hips forward and back, she tightly squeezed around his retreating shaft.

“I bet he’s loving this,” Celestia cooed, reaching over to massage her breast.

“How could he not?” Rarity purred as she lovingly fondled her opposite bosom.

Merely having Shining’s colossal cock in her would have made responding a trial, but being pawed at by a duo of devilish mares made forming a coherent thought a herculean endeavor. Groaning and rolling her head back, she spread her legs ever so slightly. It was a darn good thing that her gown was as good at concealing her proportions as it was, because the scene would look dramatically different if it wasn’t.

From an outsider’s perspective, she must have appeared as a mare suffering through a bout of minor hyperventilation, breathing hard and blushing heavily, although that couldn’t have been further from the truth of the matter. Effectively acting as a living, breathing cock-sleeve for her husband, a stallion who’d endowment could rival even that of a fully grown dragon’s tool, it took everything she had not to start moaning and playing with herself. As she held onto her seat for dear life, her tormentors grew more brazen.

Sliding one hand into her top, Celestia rubbed the bare fur of her tit. “I wonder what would happen if - excuse me, when he cums…”

“I suppose my craftsmareship would be thoroughly tested -” Rarity sighed, lightly pulling at the hem of her dress, “then again, a bit of a stress test may be intriguing. Honestly, I’m more interested to see if little Cadance here will be able to outlast her dearest hubby…”

“To - Mmmph - Tartarus with both of you,” she seethed.

Why - why was this so much hotter than it had any right to be?!? She’d been involved with threesomes before, and it was hardly the first time she’d done something erotic while out in public, yet she could already sense herself inching to a climax. Whether it was from her surroundings, that she had to keep her voice down, because Rarity was suddenly involved, the portal in her panties, or some wild combination of those or other factors she couldn’t account for, her ordinarily impressive endurance crumbled away and slipped through her fingers.

Clamping her eyes shut, she fought to think of something - anything to delay the inevitable - unfortunately for her, her plan backfired spectacularly. Her mind dwelled on Shining, imagining him seated beneath her as he bucked his hips and pounded her from below. The din of the crowd, the stadium around her, the delicate, marish fingers wandering over her shivering frame - all of it disappeared as she envisioned herself with her lover and him alone.

Losing a little more of herself with each of his thrusts, her breaths came harder and her heart beat faster. No matter where she was or what she was doing, if Shining saw fit to feel her embrace, it was her duty - no, her privilege to serve him. Fighting his backstrokes, yearning to have him as deeply as possible, she bit her bottom lip and teetered on the precipice of release.

“I think she’s close,” Rarity whispered.

Bringing her muzzle to the side of her head, Celestia breathed hotly on her ear. “Cum…”

Like some sort of spell being cast, the word was her undoing. She arched her back and spasmed, unleashing a torrent of marish juices over her seat and to the concrete beneath her, while she whimpered. The logical side of her told her she didn’t have too much to fear, what with Rarity and Celestia being the only two who could actually see her clearly, although climaxing in such a public setting was as ignominious as it was thrilling.

Wheezing and nearly cross-eyed, she had to force herself to grimace. “You’re the worst - both of you…”

“Wait until he’s finished before you hurl accusations like that,” Celestia mused.

“Verily,” Rarity agreed. “He’s only just getting started…”

Cadance fought to recover as Shining picked up speed. Her gargantuan bosoms, once safe and arcanely concealed within her gown, threatened to spill out and into the open, while her plump thighs strained the fabric over her legs. Her climax, for as wondrous as it had been, had made her expand in several areas, although she was far from the only pony making a scene.

Practically plastered against her side, Celestia teased her while getting herself off. Her right hand had disappeared between her thighs, while her left lightly tugged at her top. While she hadn’t overtly done anything to threaten the integrity of her own dress, her enthusiasm would see her pushing her attire to its limits. As if by an ironic twist of fate, moments after Cadance’s eyes fell on her, she grabbed the top of her dress and hauled it downward.

Celestia’s breasts practically exploded out into the open, defying reality and being liberated from their stifling confines. Each monolithic tit was roughly as big as a pony’s torso, driving her back in her seat and filling nearly a third of the booth, although she hadn’t just whipped them out for show. Lifting and beckoning with one finger, she set her sights on Rarity.

Rarity only hesitated for a moment before shifting her attention over to the behemoth bosoms that had been presented to her. She may have been a fraction of Celestia or Cadance’s size, no larger in stature than any ordinary pony, but the fondness she’d developed for rich, borderline decadent Princess milk had done wonders for her figure. With pudge in all the right places, a head-turning derriere, and a rack that sat heavily on her chest, she was, in spite of not being a mother herself, the quintessential definition of a MILF.

“Let me just - Whoops!” she melodramatically squawked as she sidled by Cadance and wrenched her top open. “Do excuse my butterfingers…”

Cadance would have bet every bit in the royal coffers that the accident had been anything but intentional, but she had bigger issues to deal with - namely the massive stallionhood rearranging her insides, toeing the line of a second orgasm, and finding it very, very difficult to look away from Celestia’s exposed, head-sized, leaking nipples. Though she hadn’t been hungry minutes prior, the sight of so much warm, sweet milk flowing from her mentor-made-lover’s tit made her mouth water.

Shifting slightly, Celestia used a combination of her magic and hands to tauntingly shake her breast at her. “Go ahead…”

Cadance glanced out over the balcony and scrunched her snout. “One sec…”

Acting with haste, she cast a simple noise barrier and an illusory spell to shroud the VIP box from prying eyes or ears. She’d just wanted to attend the graduation with Shining, Celestia, and Rarity, to have an innocent little outing to celebrate the newest batch of Guard recruits, yet things had gone well and thoroughly off the rails - so much so that she knew there was no salvaging it. Turning and draping herself over the proffered bosom, she bounced on her seat, milked her husband’s cock, and ran her tongue over her fellow Princess’ areola.

“So good,” Rarity muttered.

Cadance glanced over and saw that she was no longer the only mare enjoying herself. With her tits flopped out and squatted down, Rarity unabashedly fingered herself while gulping down mouthfuls of Celestia’s milk. To see the ordinarily well-mannered and refined couture acting in such an uncouth fashion would have been disconcerting, if it hadn’t been as stimulating as it was.

Realizing that things had crossed the point of no return, that herself, Rarity, or Celestia would have to leave the colosseum via teleportation, if only to avoid the public seeing them in a disheveled state, she yielded to her urges. Each gulp sent a river of milk down her throat and into her stomach while she fiercely gripped Shining’s incredible shaft. Not-so-stealthily having sex with two of the hottest, most curvaceous mares in the planet as her husband furtively fucked her through a portal in her underwear was definitely a first for her, but she could already tell that it wouldn’t be the last time for such a depraved tryst.

Muffling an ecstatic howl by cramming Celestia’s nipple into her muzzle, she was rocked with a second, even more powerful climax. The sheer amount of pleasure she was experiencing would likely drive any other mare mad, although her innate abilities, those linked to her being the Princess of Love, allowed her to maintain her sanity and savor the moment - if only just. As she drank deeply and greedily, like somepony who’d just wandered out of a desert, the sound of popping seams and tearing fabric went unnoticed.

“Here,” Celestia breathed, reclining and causing her mammoth breasts to fall to either side of her chest, “let me help.”

Being the oldest and most composed member of the trio, along with her mastery of sorcery, gave her an edge that she was all too willing to wield against both Rarity and Cadance. As she called upon her magic, her golden aura surrounded the mares’ bosoms and nethers. She began to laugh as her colleagues mewled, amused and aroused by their reaction to the additional stimulation, until her hubris bit her squarely on the ass.

Though neither Rarity or Cadance were in the best situation, with the former half undressed and the latter coming down from an orgasm, their counteroffensive was nothing short of savage. Their magic mingled and hit Celestia with full force, plowing her with a sorcerous stallionhood while toying with her clit and giving her a full-body massage. They may have been on the cusp of delirium, but neither would let the wizened demigod go unpunished for her perverted transgressions.

Safe and secure within the enchantment Cadance had carefully cast, the trio became more and more passionate. Celestia howled out and spasmed as she came, pushed past her limit as both her bosoms were suckled upon, while Rarity and Cadance gagged and sputtered around the colossal nipples they were nursing on. The ceremony was only a few dozen yards away, they were in the last place anypony should become intimate, and yet they forgot all about where they were and what they were supposed to be doing.

Cadance recoiled, swallowed her mouthful, and covered her muzzle as she demurely burped. “I don’t think -”

Riiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiip

Mid-sentence, her dress detonated and was reduced to rags. The combination of enchantments and eldritch fabrics, coupled with her growth caused by her welling passion and influx of several gallons of milk, turned her dress into a bomb of sorts - a harmless bomb that rained glittering shreds of fabric around her, but a bomb all the same. Her distended, incomprehensibly gravid belly pushed her thighs apart and came to settle between her feet, her tits almost pushed Rarity off the balcony, and her ass crushed the chair she’d been seated on into nonexistence, reducing it to atoms, while she toed the line of a third orgasm.

There was no reason to hold herself back at this point, positively drenched with a mixture of marish nectar and breast milk, but that didn’t stop her from trying to retrain herself. Slowing her breathing and bucking her tush on the concrete beneath her, she delicately bit down on the teat in her nearly dislocated jaw and earned herself a squeal of delight. Celestia’s rack may have been a touch bigger than hers, although that may change if she kept getting bigger.

“Aaaaaaaghn!” Rarity screamed as her knees quaked and she fell forward onto Celestia’s breast.

Hearing her friend cum chipped away at Cadance’s resolve, but her self-control disappeared when she looked over. Rarity’s gown had burst down the middle, unveiling her sagging, gurgling belly. Seeing her friend’s doughy belly, imagining that it was filled with a foal and not just milk, brought her to the gates of nirvana in the blink of an eye.

She brayed to the heavens, her toes curled, and her eyes rolled back as her figure ballooned outward. The prophetic notion she’d had moments before, that it wouldn’t be impossible for her to eclipse Celestia’s figure, was proven all too true. Now bigger than her fellow Princess, doughier and larger in every way, she wailed uncontrollably and was beset with rapture.

Celestia climaxed a split second after her, adding her blissful howling to the cacophonous symphony, and grew as a result. It was silly to think that it was some fashion of competition, that the alicorns were trying to outdo one another, although that’s essentially what ended up happening. Sandwiched between the two titanic and soft mares, pinned in their cleavage and against their bellies, Rarity wailed and thrust a hand to the heavens.

Glancing down and seeing an alabaster hand protruding from her bosoms, Cadance shrugged. Judging from just how intense Rarity’s climax had just been, she wasn’t all that worried about her friend. Shifting her attention back to Celestia, now that one mare had been essentially dealt with, she set her brow and forced a grin.

“Your turn,” she growled, focusing her energy on the Princess.

Amplifying her magic, Celestia pulled out all the stops. “You first…”

Now, unlike minutes before, it was a competition between them. Dueling with pleasure and with folds of yielding flesh spilling over the balcony, the alicorns pitted themselves against one another without restraint. As quickly as one would be stricken with an orgasm, the other would follow moments prior, until they were both cumming at a startling rate. With every climax came new growth, filling the entire area until it resembled a concrete swimming pool of breasts, bellies, milk, and two panting, semi-coherent Princesses locked in carnal combat.

Cadance thought she’d gained a slight advantage after Celestia spasmed endured her umpteenth orgasm, but any edge she held was lost when she sensed Shining throbbing within her. The devastating realization that she was about to be filled with an inordinate amount of foal-batter came several moments too late to do anything other than brace herself. Sensing him flare against her womb, she was wracked with blinding ecstasy when he erupted inside her.

Getting creampied by her beloved always - always did her in, and this time was no exception. With her mouth hanging open in a silent scream, she came with the full fury of a collapsing star. Her mind went blank, her limbs fell slack, and any determination she had to conquer Celestia withered away to nothingness. It would have been bad enough to have victory snatched from her clutches, but then she heard it - the unmistakable and terrifying crack beneath her.

It took every ounce of strength she had to summon her power. If there was even the slightest chance that the balcony Celestia, Rarity, and herself was on would collapse, there would be more than just their lives at stake. Tweaking the shrouding spell’s workings, she magically flung the VIP box and everypony in it to a remote glade outside of Ponyville. Would a duo of Princesses winking a section of the colosseum out of existence raise questions? Yes, undoubtedly so, but it beat potentially sending somepony to the hospital.

Celestia yelped as she went crashing to the earth and rolled onto her back. Fairing no better than the startled alicorn, Cadance landed and levitated Rarity onto herself as she landed with an inglorious flop. If nothing else, her size made her a convenient and startlingly effective landing pad for the incoherent unicorn entombed in her bust.

“T…truce…” Celestia rasped.

“Truce,” Cadance wheezed, lifting a shaky thumbs up.

In a flash of light, Shining appeared with his dick buried in what appeared to be a fuck-toy. “What the heck just…oh…”

“Hi, honey,” Celestia and Cadance groaned in tandem.

The Princesses looked at one another, snickered, then broke into outright laughter. They’d made a spectacular mess of things, including themselves, and they’d likely caused several thousand bits worth of damage, but there was no sense crying over figurative or literal spilt milk. Between the four of them, they could come up with a semi-believable explanation for their abrupt departure - if they couldn’t, it wouldn’t be the end of the world. Dreamily looking up as Shining came over to check on her, Cadance smiled. No matter what happened next, or what sort of fallout she’d have to deal with, she was glad that the graduation hadn’t been as boring as she’d predicted…