Twilight Sparkle sat alone in her royal chambers, staring intently at a blackboard absolutely filled with arcane formula. She tapped her chin thoughtfully, uncaring to the general chaos that surrounded her. Books and papers were piled haphazardly into small mountains that dotted the room seemingly at random.

The room itself was as large as Celestia or Luna’s room, before they were merged into one room of course. As such, it had all the pomp and grandeur that one would assume from the royal quarters. The walls were a shade off from Twilight’s fur and all throughout the room there were further allusions to the mare’s colors. From the deep blue color of her mane being used for the drapes and even the magenta and pink stripes in her mane were used sparingly throughout the room.

All in all it fit Twilight to a T and though she had initially found it rather arrogant to decorate a room solely with her colors, she had grown to enjoy the color scheme. It was homey, and reminded her of her teacher’s own room. (Other then the lack of millenia old artifacts displayed here and there of course).

The mare nodded slowly and added a checkmark to the corner of the blackboard, adding to two ticks already there. With her work triple checked she finally allowed herself a grim nod of satisfaction. The work had been difficult and balancing dozens of spells, and potions while taking into account the unique physiology of an alicorn had been a challenge for the brilliant mare. In the end she had managed to do everything her teacher had set out for her, and then some.

Sure she had to rework half of the spells and more then three quarters of the potions and she may have invented a new school of magic while she was at it but that was a small price to pay for insuring Equestria’s safety. She blushed, a hoof returning to her lower stomach suddenly, a deep need suddenly welling up inside her. She lit her horn, intent on suppressing this strange urge like the rest, only to find that the spell seemed to demand far more power then usual. With a grunt of annoyance she poured herself into the spell, until it finally it completed and subdued her more base urges.

Twilight breathed heavily, feeling the weight of the strange desires bearing down on her. The urges were normal, as it was about that time and yet they were abnormal in their sheer intensity, almost overwhelming the alicorn at several occasions before she managed to cast the suppression spell.

She sighed, falling into her bed with a soft flomp sound. Just another thing I have to bring up with Celestia. Speaking of which…

She glanced at the clock, only now realizing the time. “Oh no! She’ll be here any minute!”

The purple alicorn galloped across her room, her telekinetic aura scooping up papers and books at random before placing them gently in her near empty closet. Rushed though she was, the pony refused to harm any books due to her own poor time management. With a flash of her horn the closet was slammed shut and locked.

With that done she glanced around the room, quickly taking stock of her situation.

The rest of her room was relatively neat, save for the blackboard that was still filled with equations and formula. That was fine, all things considered though and she pushed it out of sight before tidying the rest of the room. Take out boxes were vaporized, trashy romance novels were hidden under her bed and finally the curtains were drawn, giving the alicorn the first rays of sun her skin had felt in three days.

She winced, covering her eyes with a leg while mumbling darkly about the damn sun always stabbing her eyes.

“Really Twilight? I thought you loved my day.” A voice said from her now revealed balcony.

Twilight blinked, rubbing the remnants of sleep from her eyes. “P-princess!”

Princess Celestia tittered behind a hoof. “Oh you are just adorable when your perplexed.”

Twilight gulped. “How long have you been sitting out here?”

Celestia tapped her chin thoughtfully. “Oh, from about the time you sung that adorable double check song.” Twilight blushed and rubbed the back of her neck. “You really should work on your high notes though, that part where you sung about the pleasures of double checking things felt a little off to me.”

Twilight’s blush doubled in size, causing Celestia to burst into laughter and for Twilight to cross her hooves in mock indignation. “Did you come here just to tease me?”

“Absolutely not my dear, if I may?” Princess Celestia gestured to the entrance gracefully.

Twilight nodded her ascent, silently musing at the few old customs Celestia still kept. “How were all the uh… preparations?”

Celestia nodded somberly. “They were uneventful for the most part. The nobility caused a ruckus when they heard I might be taking a leave of absence but quieted right down when I appointed one of their own as reagent.”

“Really? Is that a good idea?” Twilight asked incredulously, trying to imagine a noble actually doing a good job in the absence of the two sisters.

“No need to worry, I appointed that Fancy Pants fellow. Besides, he doesn't actually have the power to do anything other than to report to me and receive orders.” Celestia waved her hoof dismissively. “He's a glorified errand boy that will allow me and Luna a little time off when we begin to show.”

Twilight nodded slowly. “That makes sense. So everything is ready for the uh, main event so to speak?”

Celestia giggled at Twilight’s awkwardness. “Provided that your own preparations are complete then yes, I believe we can proceed as planned.”

“Oh that's uh… good?”

The larger alicorn paused, a little put off by her younger’s reluctance. “Are you alright Twilight?”

Twilight looked down and shuffled nervously. “It's just you were so distant and we still haven't talked about whatever you wanted to talk about.”

“Ahh, that.” The alicorn trotted over to the mare’s bed and plopped down, patting the spot next to her. “Come, sit.”

The purple mare did as she was told and sat close to Celestia, only to feel the other alicorn pull her a little closer and wrap a wing about her body. Twilight blushed a little, remembering all the times Celestia had done this when Twilight was young and feeling awkward.

“Twilight, I know you value honesty so I’m going to be frank with you.” Twilight ears perked up and she looked up at the strangely serious alicorn. “There is no threat. Or that is to say, no real threat.”

“Whuh?” Twilight muttered, her mouth hanging open.

“The changeligns might be able to do such a thing, and we didn't lie about most things, but rather we have no reason to believe Thorax’s story is anything but genuine.” Celestia explained, much to her former student’s confusion.

“What, why bother with all the cloak and dagger then?”

“Twilight, I’m sure you've noticed that you haven't gotten your heat since becoming an alicorn and this is part of our rather… unique physiology.” Celestia coughed awkwardly. “It's rather odd to explain this but the truth is, alicorns don't have a regular heat like normal mares and instead have a heat once every thousand years. This heat is incredibly intense and so all consuming that the alicorn’s mind is nearly consumed by the urge to breed.”

Twilight gulped, a hoof going to her lower stomach where the heat still burned faintly. Celestia smiled and pulled her former student closer. “Be glad you don't have to deal with this for another few hundred years. The last time a bunch of alicorns went into heat at the same time we went to war with Sombra then split the nation and fought each other.”

Celestia shook her head slowly. “Truly, alicorn heat is more a curse then a blessing, even if we don't have to worry about heats for nine hundred and ninety nine years.”

Twilight winced. “Theoretically, what would this heat feel like?”

Celestia lifted an eyebrow, reading the concern on her face. “Well… It would feel a lot like a normal heat only it would come randomly throughout the day in increasingly growing surges of heat. If you use spells or potions to try and subdue it you will find they become mostly ineffective by about day five, and useless by day seven. By then the urge to breed will nearly consume your mind and drive you to do things you may not have imagined.”

The solar alicorn shook her head suddenly, dismissing a bluff. “It is… unpleasant but if you do manage to get pregnant then it abates entirely, freeing yourself of it's incessant heat and allowing you to think once more.”

Twilight gulped. “Oh wow, that sounds… disturbing.”

“It is not the most pleasant of circumstances, which is why Luna and I were so hell bent on making sure we got knocked up this time around.” She smiled lecherously, the alicorn’s mind going to thoughts of Luna’s swollen belly and massive, milk engorged tits.

Twilight shook her head and chuckled, endlessly entertained by just how easy it was to tell what her mentor was thinking. “She really is that attractive?”

Celestia smiled wistfully, staring off into the distance. “I would trade the very sun for her.”

The younger alicorn rolled her eyes. “Would you like to see some of the breakthroughs I made? I think you are really going to like one of the spells I made.”

“You made a new spell for just such an occasion?” Celestia smirked. “How very Twilight of you.”

The smaller mare pouted in mock indignation. “I can't believe Rainbow Dash got everyone saying that…”

“You must admit it is rather fitting.”

Twilight grumbled softly. “Do you want me to show you the spell or not?”

Celestia pulled back her wing and gestured towards the mare’s desk. “By all means, I am most intrigued to see what you have come up with.”

Twilight eagerly leapt off the bed, and trotted over to her desk, completely forgetting any lingering dread that had settled over her. “Do you remember back when you were first teaching me about potions and you stated that the spells and their alchemical counterparts could not coexist. Well, I seem to have figured out why spells and potions meant to do the same thing react so poorly.”

Celestia gasped. “Really? My alchemists have been trying for decades to figure that out.”

Twilight grinned confidently. “Actually it was those alchemists that got me thinking about it and after I got a hold of their notes I noticed that…” She paused and took a deep breath, stopping her train of thought before it had a chance to pick up stream. “Basically if you make the spell do the thing you want the potion to do only slightly differently they react better. It sounds small but-”

“It is anything but!” She smiled proudly at the beaming young mare. “Once again you have worked ahead of your lesson plan.”

Twilight blushed profusely, her face tingling a few shades red. “Aww, it's nothing. What I really wanted to show you is this new spell! It is a little more flashy then some formula work I did.”

“Don't discredit yourself Twilight, that ‘formula work’ as you call it has stumped many an alchemist.”

Twilight smiled triumphantly before reaching into a drawer and pulling out a large scroll. “Tada!” Twilight unfurled the scroll that fell and fell until it nearly touched the floor, revealing hundreds of lines of text. “I call it Twilight’s bounty!”

Celestia blinked, her eyes slowly scanning down through the many, many lines of descriptions, formula and instructions that littered the scroll. “Wow. I don't suppose you would mind demonstrating for me by chance?”

Twilight shook her head. “Absolutely not.” She lit her horn and after a few tense moments of concentration she released the energy, which exploded into several lines of glowing purple energy.

The energy rocketed outward before becoming lighter, until it became a light pink that curled back around and streaked towards the caster. When the lines of energy struck the mare’s skin they instantly faded, while Twilight’s fur was suffused with the same colored glow. Eventually all the energy had sunk into the mare’s body which glowed a faint pink before returning to normal. Twilight reared up, using a nearby chair as balance, showing a small glowing pink rune that now stood out just above the mare’s breasts. “Interesting…” Celestia mused. “What, exactly does it do?”

Twilight blinked, then slapped a hoof to her head. “I should have started with that.” She sighed. “It increases the amount of foals a mare can carry, but this differs from the old spells.”

“Oh.” Celestia leaned in closer, peering intently at the small rune. “How so?”

“For one, it doesn't just stimulate the mare’s ovaries into releasing another egg, which is inherently dangerous and unreliable. Rather it creates one, using the mare’s own body as a template.” Twilight gestured to the rune. “As long as the rune is glowing any err, coupling the mare does is guaranteed to create another egg. I took the liberty of combining it with the minor polymorph spells that change the mare’s body to be able to carry the increased weight.”

Celestia’s wide eyes grew even wider, imagining Luna rendered unable to even walk due to the sheer amount of foals growing in her massive belly. “How many foals could this spell support?”

Twilight hopped back down and tapped her chin. “In theory dozens, so long as the mare’s body has necessary amount of magical energy from which the spell could draw on it could theoretically support hundreds.”

Celestia nearly swooned and she had to place a hoof against her rapidly beating heart. Be still, mine beating heart. “You must teach me this spell.”

Twilight blinked. “Of course princess Celestia. It all starts with-”

Celestia’s smile grew larger and larger until it nearly encompassed her entire face. Twilight’s teaching method was a bit heavy on the theory but Celestia had experience learning from a teacher who was on the rambly side and in no time she had learned the new spell.

“-There you go, just remember to be gentle with the end of the spell. It doesn't seem to work as well if you try and force it.” Twilight remarked, staring intently at the white alicorn whose horn glowed like the morning sun.

Celestia nodded solemnly before doing as she was told. The magic released much the same way as it had when Twilight had cast it only the rays of energy were much more numerous and were the same color as Celestia’s magic before turning into the same color pink that Twilight’s spell had.

“Oops. I may have put a little more power into that then strictly necessary.” Celestia remarked plainly, hiding a small impish smile.

As the spell flowed into her Celestia could vaguely feel a tingle begin to erupt beneath her skin. Starting from the points the spell had entered her body and suffusing the entirety of her being before focusing itself directly within her womb. The strange sensation of feeling one of her internal organs was an odd one but not as off putting as one might think. The strange sensation passed quickly and Celestia was left feeling almost exactly the same, save for an unusual tingling rising from her nethers.

“It uh, takes some getting used to.” Twilight remarked, rubbing her neck awkwardly.

“Interesting…” Celestia mused, a cheshire grin spreading across her face.

“If you’d like I could add it to the list along with all the other spells.” Twilight offered.

Celestia nodded eagerly. “Please do, I’ll tell them all about this little spell.”

Twilight lifted an eyebrow but reluctantly shrugged. “Alright.”

“Is that everything I need to know?”

Twilight nodded. “I think so. Is everyone ready?”

“Cadence and Shining Armor should be arriving within the hour, do you want to join me and Luna in our chambers?” Celestia asked, a small lecherous smile on her lips.

The younger mare blushed profusely and looked away. “So long as I’m not intruding on anything.”

“Of course not, Luna rather enjoys being watched.” Celestia giggled, trotting over to the door and glancing back at her blushing former student. “Are you coming?”

“Err yes, just give me a second to gather some notes and grab the potions.” Twilight threw open the door to her closet and quickly extracted a large clinking box that Celestia assumed, carried the potions.

The nervous mare tucked a small notebook under a wing and while holding the box aloft in her aura she trotted up to her mentor and nodded. “All ready.”

“Good.” Celestia opened the door and proceeded out into the hallway, pausing only to nod politely to the guards standing just outside.

Twilight did the same but with more enthusiasm, eagerly following close behind her mentor and doing her best not to read too deeply into the older alicorn’s remarks. Time flew by and soon enough the pair found themselves before the large double doors of the royal pony sisters room. One door was dominated by a large flaming, orange sun, while the rest of the door was either gold or was painted to look like it was. The other had a mirrored image of a blue moon that formed the other half of the sun, while the rest of the door was a soft silver color.

Although it appeared simple at first glance the door itself was quite the masterpiece of artistry and as a watcher stared closer they would begin to notice many hidden details. Such as the reflective shapes of two great alicorns hidden within their respective heavenly bodies, that were only viewable at the right angle. It reminded Twilight of the classic depictions of the royal pony sisters only these seemed more alive in a way and a small band of something was clasped about the base of their horns.

Twilight blinked and looked up at an amused Celestia. “Done staring at our door?”

“I just have only seen it in passing. It's much more marvelous then what I first gave it credit for.”

Celestia smiled triumphantly. “Do tell that to Luna, she was afraid she was a little too subtle when crafting the door to our quarters.”

“Luna made this?”

The white alicorn nodded, a proud smile stamped on her face. “Oh yes, during her time away she spent centuries learning the art of crafting all sorts of things. I must admit i’m rather envious, as the only thing I can craft is a nice meal.”

The two shared a brief chuckle before Celestia pressed a hoof against her side of the door. Bereft of handles or any other method of opening, Twilight had assumed there was some manner of spell that would enable to the door and sure enough when Celestia’s hoof touched the metal it glowed faintly before the door creaked open. As the door opened soundlessly the pair could faintly hear the whispered words of Luna emanating from the enchanted steel. “Welcome home, my love.” The door whispered before faithfully parting, allowing the pair to step inside.

Twilight blushed at the naked admission. “Was that part of the spells on the door?”

Celestia nodded proudly. “Luna recorded over two hundred unique lines just to ensure that whether she was here or not I would always hear her voice when coming home.”

The purple alicorn couldn't help but feel a sliver of envy, which was easily overridden by the sheer cuteness of the situation. “Aww, that's adorable.”

“Neigh! It's romantic.” Called the distinctive voice of princess Luna.

Celestia rolled her eyes. “Yes, yes dear.”

Luna huffed in mock annoyance, throwing her head a little too high to be taken seriously. Twilight giggled. “I love the door you made Luna.”

“Truly? I had thought I was too subtle.” Luna remarked.

“Any mare would be happy to have such artistry in their home.” Twilight announced.

Luna grinned. “That is delightful to hear! But if you will excuse me a second, I need to attend to my little star.”

Celestia giggled and rolled her eyes once more. “You know very well I’m not the little one in this rela-oof!”

Luna leaped upon the white alicorn, toppling them both to the ground in a heap, with Luna standing atop the other alicorn. “Yes you are.” She quipped.

Then, before Celestia had a chance to mutter a rebuttal she found her lips assaulted by her sister who pressed against her with all the instance of a lover whom she had not seen in years. Twilight thanked the stars the magical door had closed so nopony else could see the rather intimate tongue assault that Luna was launching. The purple alicorn took a step back and shielded her eyes from the sight, only for her curiosity to get the better of her. She peaked around the side of her hoof and watched as the pair of alicorn’s pressed against one another like a pair of newlyweds.

Luna seemed instant about staying on top and in control and though Celestia fought back it was a feeble effort that Luna was easily able to overpower. For almost several full minutes the pair of alicorns furiously made out in front of Twilight who had grown increasingly envious as time passed. With great reluctance Luna pulled back, freeing her sister’s lips and allowing them to both take deep, gasping breaths.

“You should invite Twilight over more often, my love.” Luna remarked.

Celestia blushed softly and glanced at her former student. “I am sorry Twilight but Luna has always been a rather insistent lover.”

Luna scoffed. “Sorry? I swore you nearly finished once you noticed Twilight watching us.”

Twilight and Celestia blushed hard, both sharing a nervous glance at one another. Twilight recovered first and gulped. “Should we get on with the spells now?”

Celestia nodded and gently pressed a hoof against Luna’s chest. “Would you please get off of me?”

“Oh I’ll get you off alright.” Luna said with a smirk.

The eldest alicorn giggle snorted adorably, causing the other mares to laugh as well. Luna reluctantly got off her sister, though the act was unfortunately literal in this instance. Now free of the smaller alicorn’s grip, Celestia stood back up, flexing her wings and limbs in turn before facing her sister and former student.

“Alright, Cadence is nothing if not punctual so we should begin with our preparation.” Celestia announced.

Luna nodded. “Excellent thinking sister. By the time we are finished I’m sure they will be here.”

Twilight was busy unpacking the box and setting aside the many vials and bottles that filled the wooden container nearly to the brim. With practiced ease she floated the various glass containers in her magic, flipped over the box and gently arranged them from left to right, leaving a large group set aside for the other two participants.

The purple alicorn lifted two small purple vials of liquid. “Endurance potion, this one doesn't taste very good so don't let it hit your tongue.”

Celestia nodded and threw back the mixture as instructed. Luna however merely scoffed, internally reassuring herself that she was the toughest mare in Equestria. She threw back the potion and swallowed normally, the thick, viscous liquid sliding across her tongue.

“Blech.” Luna pulled her tongue out with her magic and began vigorously scraping it of any left over residue.

The two other alicorns shared a laugh at Luna’s expense who merely shot them a glare, unable to give voice to her annoyance. After the offending liquid had been purged from Luna’s mouth Twilight lit her horn.

“Next is a flexibility spell, will ensure that nothing gets tense or ends up cramping.” Twilight remarked flatly.

Luna raised an eyebrow. “Just how many spells are you going to cast on us?”

Twilight concentrated briefly before releasing the pent up energy in a small flash of light, which seemed to gather into two orbs that flew into the other alicorn’s chest. The feeling was strange, muscle groups that Celestia had gotten massaged a hundred times became more loose then after even the most rigorous of massages. Luna felt similarly, only on an entirely different level and her eyelids fluttered as a tiny moan escaped her lips.

“Ooh, that's good. You must teach me that one.” She remarked, eyes still shut as she flexed her wings.

Twilight chuckled. “It should last several days unless actively dismissed.”

Both of the elder alicorns gave their younger an approving nod, which Twilight hardly noticed as she had already grabbed another potion. “This one should fertility and works in juncture with the other spells and potions for a compounding effect.”

Celestia grabbed hers eagerly while Luna eyed it cautiously. Twilight rolled her eyes. “It tastes like bubblegum.”

Luna’s eyes lit up and like a kid with some new candy she eagerly drank the vial. The alicorn smacked her lips audibly. “Mmm that it does.”

Celestia downed hers a little more gracefully than her sister.

And so Twilight launched into another round of spells and potions until finally the two alicorns positively glowed with magical energy. Side effects seemed minimal, other then a slight tingling emanating from Celestia’s breasts and more precisely her nipples. Luna suffered similarly but to a lesser degree, which was amazing in itself as there were a lot of spells and potions at work here The scholarly mare had evidently put a lot of effort into her preparation as the spells covered seemingly everything, from flexibility, fertility, and a potent set of aphrodisiacs, Twilight had covered nearly all the bases.

With a satisfied nod Twilight’s horn grew dim for the final time, the last spell slowly working its way under the two alicorns skin. “There, that's all of them.”

Luna shook her head and wiped a bead of sweat from her brow. “I am most impressed young Twilight, those were no easy feats of magic.”

The younger alicorn shrugged, hiding a small blush. “It was nothing, just practice.”

Celestia shook her head, trying to dismiss the cloying thoughts that commanded her to breed. “That was not nothing, you have both my and my sister’s gratitude.”

Twilight’s blush grew until her nonchalant attitude could contain it no longer. “Aww, thanks you two. I just have two last ponies to prepare and we should be ready to go.”

“Who I believe are waiting just outside.” Celestia commented before lighting her horn and opening the large double doors. Revealing a blushing Shining Armor, whose hoof was raised to knock and a madly grinning Cadence who seemed positively overflowing with energy.

Cadence trotted into the room confidently. “I told you she would open the door just as you are about to knock. She does that every time.”

Shining Armor chuckled. “I should have known.”

Twilight’s blush finally faded and she eagerly trotted over to the couple. “Hey you two!” Twilight and the couple exchanged brief hugs greetings before assembling near the impromptu alchemy stand.

Cadence nodded to the two larger alicorns, her smile containing a faint wisp of impish delight. “Good evening your majesties.”

Celestia eagerly wrapped her younger alicorn in a brief hug. “So glad you could make it, I was beginning to think Twilight’s planning would be all for nought.”

“We are quite glad you brought the male along as well.” Luna added.

Shining Armor snorted. “I’m glad I was brought along as well.”

Celestia rolled her eyes and elbowed her sister. “Be nice you.”

Luna huffed and crossed her hooves. “Let's get this done, shall we?”

Twilight took the opportunity to slip between the two, enthusiastically holding two vials of the same purple liquid that she had given the other two. “Who wants some endurance potions?” She said with a smile that was a little too wide.

Cadence sighed in relief and eagerly grabbed the vial, throwing it back in a single motion. A move that was mirrored by her husband who handed the empty vial back. “Ooh, that's a good one. Reminds me of the batch we got from Las Pegasus during our honeymoon.”

Cadence rolled her tongue in her mouth a few times before nodding her ascent. “Almost, it's a little too heavy on the fortitude enhancement though, more like the ones we got in Manehatten that one time.”

“Ahh, that’s what I’m tasting. Have I ever told you that you have a very talented tongue?” Shining asked with a smirk.

Cadence rolled her eyes. “Only every time I go down on you.”

The couple shared a laugh while the other three alicorns looked on with mixed expressions. Luna seemed vaguely miffed still, but unperturbed by the rather risque flirting. Twilight was about as red as a beat and was furiously attempting to remove the image of her sister in law and brother sixty-nining, and failing utterly. Celestia seemed intrigued, a slight, rather pleased expression on her face.

A talented tongue eh? We will have to see about that. Celestia thought to herself.

Twilight coughed, drawing the attention of the flirting couple. “If your done flirting, we have a lot more spells and potions to get through and I’m sure that Luna and Celestia are uh. ‘Ready to go’ as they say.”

Cadence chuckled and shook her head. “We really need to get you laid.”

Twilight and Shining shared a nervous glance, both awkwardly laughing before turning away. “Right, onto the next spell!” Twilight announced with a little more volume then what was comfortable.

Spells were cast and potions drank all while two increasing impatient alicorns watched on. The pair had retreated to their enormous bed that was so large it was easily enough to fit four full grown alicorns on it with relative ease. Luna lay draped over her sister’s back, her head resting on top of Celestia’s. She had long since run out of teasing energy and all her best jabs were used up so she simply sat on the world's most comfy pillow and watched with a bored expression. Celestia was enjoying herself immensely, silently making a note to commend Twilight on her endurance spell casting.

Their arousal had dulled over time, becoming little more than a slight reminder at the back of their minds. As they noticed Twilight was beginning to wrap up, that same arousal surged to the forefront of their minds and Luna nibbled absently at Celestia’s ear. The solar alicorn herself wiggled awkwardly under her sister’s tender ministrations, her eyes glued to the impressive package that now hung beneath Shining’s legs.

At first it had been barely noticeable, with Shining Armor merely lamenting about a tightness in his privates but that quickly changed and grew to become much more intense. Growing until everyone in the room could hear the magic due it's work, making the male’s above average cock grow to truly impressive proportions. Celestia stared in wonder through the entire thing, much to Luna and Cadence’s annoyance though at least the pink alicorn’s distaste waned as the male’s genitalia grew to it's new massive size.

All while Shining stood in slowly increasing paranoia and discomfort. The magic itself was fairly gentle and there was little pain other than a small pang when it finished growing to it’s new length. More annoying then the spells and potions were the looks. He could handle Luna’s barely restrained disdain but the predatory hunger in Celestia and then his wife’s eyes made him nervous in a way he couldn't wholly explain.

By the end it had swelled from a pleasant seven inches to a massive thirteen inch behemoth, which, to Twilight’s credit looked completely natural. No strange veins, coloration or anything else about the stallion’s now massive cock seemed off at all.

That wasn't the only thing that had grown somewhat however and Luna licked her lips at the sight. Cadence’s large, motherly breasts had grown as well, apparently reacting to the potent fertility spells flowing through her being. Their size change dwarfed even her husband’s transformation, going from a large but still manageable pair of above average, cantaloupe sized breast, to a size that Luna hardly had a reference point for. They were the single largest pair of breasts other than Celestia’s that Luna had ever seen and she couldn't tear her eyes from the pendulous pair. When Luna stared at them in wonder, all she could think about was pressing her face in between those lovely pink orbs, and watermelon. She wasn't quite sure why watermelon, but that was the only thing she could think of that neared Cadence’s massive new size.

Luna had only ever cast sidelong glances at the growing appendage, much more interested in watching as Cadence’s breasts slowly filled out and her hips grew to match. Even Celestia felt a small spark of envy burn in her heart, though that wasn't enough to make her tear her eyes from the male’s impressive package.

Cadence handled her expansion with a quiet air of dignity, for the most part. When her hips had changed she had dryly remarked that her dresses hardly fit her anyway and that this was a good excuse to get a new wardrobe. When her breasts had ballooned to new and unmanageable size she had been slight less dignified about it and had lamented at length of the uncomfortable sensation of feeling them rub against her legs.
Luna licked her lips once more, whispering in Celestia’s ear. “How much you wanna bet Cadence has an even bigger nipple fetish then you.”

Celestia giggled. “I don't know… I love what you do to me.”

Luna nipped at the white alicorns cheek. “Don't I know it.”

The pair whispered back and forth, eagerly chatting about the many physiological changes while the couple in question shifted awkwardly. Shining Armor managed to take his changes in stride with an ease that suggested experience. Cadence however, was much less pleased, and shifted from hoof to hoof while casting the odd glance between her legs.

“Are you sure that it’s natural? They weren't this big when I had Flurry Heart.” She remarked.

“It was well within the realm of possibility.” Twilight stated achedimcaly.

Shining Armor cast his wife a quick sidelong glance. “You look amazing, my love.”

“I feel like a cow that's ready to be milked.” She replied dryly.

Twilight did her best to pry her eyes away from the couple’s newly enhanced features. “Alright, one last one and…” She lit her horn and quickly cast the last spell. “That's it.”

The spell slipped under the couple’s skin and quickly disappeared. Leaving two rather intrigued ponies to glance at each other. Shining Armor blinked owlishly as his eyes beheld his wife’s newly enhanced form. “Wow, you are…” He shook his head, at a loss for words.

“Beautiful beyond words.” Twilight finished. Cadence glanced at the purple mare curiously, who only now realized what she had said. “I-I- err.”

Cadence giggled and quickly leaned into the purple mare, planting a small kiss on her lips. “Thank you.” She whispered huskily into the other mare’s ear.

Twilight’s mouth hung open for a second before turning to her brother who merely shook his head and laughed. “The heart is a strange thing.” He said simply.

Twilight’s face grew beet red. “Okaygottagobye!” Then in a flash, she was gone.

Twilight reappeared with a flash of purple light in her room. Her breathing was heavy, her face flushed and her knees weak. In the quiet, the mare collapsed to the ground, her face pressed against her hooves.

“Oh my gosh, what have I done?” She asked no one.

When no one answered the mare groaned and silently wished the floor boards would open up and swallow her whole. Alas they did not, leaving her alone with intense warmth that threatened to consume her every thought.

Author's Note

There might be a few errors left so if you see em pm me or leave a comment.
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