"C'mon, we're going to be late!" Twilight said in a mixed tone of excitement and nervousness, her stomach a tangle of the same, butterflies dancing freely in her belly and her mane lightly frazzled. "It was hard enough to make time for this, what with all our royal duties, and it would be a shame to miss our appointment! I think I'm already starting to show, and we were supposed to do this two months ago!"

Celestia and Twilight had been dating for the past few months since Celestia had indeed impregnated her, the sun princess holding true to her promise that she wouldn't merely use Twilight as a broodmare, and that she genuinely had a romantic interest in her. The dates had always been nice, though they were only held at the castle for the time being, until they decided to tell their friends and families, then Equestrian as a whole, about their relationship.

Celestia chuckled, placing her hoof upon her lover's withers softly, and met eyes with her. "Come now, we're both princesses of Equestria. Surely they won't mind if we're a few minutes late," she said, her hooves softly rubbing her marefriend's back, then wrapping her in an embrace. "You need to calm yourself, your back is very tense. Here, turn over. I'll give you a massage to loosen that tension. Stress isn't good for a foal, especially not in the earlier months of pregnancy. It can lead to..." Celestia visibly slumped a bit at the thought, "...complications, or...spontaneous miscarriage."

Twilight sighed, placing a hoof softly to her chest as she deeply inhaled, then moving it away as she breathed out, a calming technique taught to her by Princess Cadance. She repeated that a few times before rolling onto her belly and exposing her back. Celesta did as she said, moving and positioning herself before she started softly massaging her back, trying to relax and calm her mare down. "I know, it's just...this is my first pregnancy, and my first time getting a foal-viewing. I mean, what if something's wrong with our foal? What if..." Twilight said, before she stopped talking as tingles of relief went through her as Celestia's hooves got to work.

Celestia suddenly pushed down more firmly on Twilight's back, hearing a series of pops issue forth from it, and a louder groan from Twilight. Knowing from her past experiences with mares she'd given foals, and when she herself had carried her own children, Twilight would very much be needing massages as the pregnancy progressed and the strain on her body increased, and this one would likely be the first of many. "Are you OK? That didn't hurt, right?" Celestia asked worriedly.

"Oh, no...no, quite the opposite. That spot's been bothering me all day!" Twilight cooed, pleasurable tingles rolling through her as Celestia's talented hooves kept kneading her tight muscles.

Celestia kept rubbing for a while, getting soft groans or moans of relief from Twilight as her well-practiced hooves loosened knot after knot, the elder mare giving quiet clicks of the tongue as she did. "So worked up over a simple ultrasound. You do know it won't hurt, right? Plus, we will get to see our foal for the first time! Isn't that something to look forward to, instead of fear?"

"I...I guess so. It's just...this is all so new to me. So sudden. I've never even been to the OBGYN department, except for basic pelvic exams!" Twilight said, squirming a bit to guide Celestia's hoof to a sore spot. "AAH~!"

Celestia stopped immediately. "Did I hurt you?" she asked, the worry blatant in her tone.

"Yeah, but it was a good hurt, the kind that tells me it's gonna feel better soon," Twilight responded, looking over her shoulder and smiling to her love, "Please, keep going."

Celestia gave the sore spot a gentle kiss, then kept massaging it, "Aren't you excited to see our foal? The product of our love; that lovely night's efforts in the flesh? Or was I too sudden with wanting a foal from you? Did you truly not want one with me yet?"

"What, no!" Twilight said, looking back at Celestia, hearing her tone growing more sad, "I really did want to have a foal with you, but...I'm still adjusting to the fact I'm going to become a mother in another eight or nine months, you know? It still makes me nervous, and seeing the foal in my womb...knowing I have another life inside me for sure," Twilight said, before shaking her head and sighing, "I'm just being silly, I know. I mean, my uterus isn't expanding just because. My last two estruses didnt come. I know I'm pregnant already, but...something about seeing our child inside me makes me...scared."

Celestia stopped rubbing and, when Twilight looked up at her to see why, placed a soft kiss on her lips. Twilight pushed back into it needily; not lustfully, but needing the comfort her mate's kiss provided. "It'll be OK, you're going to be a great mother. That's one of the reasons I chose you, you know? You have good maternal instincts, if you practically raising Spike into the fine drake he is today is any indication," Celestia said, pulling away from the kiss gently, "Well, that and your magic talents, your health, and of course your beauty, intelligence, and accomplishments, the fact you're an alicorn....our foal will be so amazing..."

"Oh, Celestia..." Twilight said, feeling her cheeks flushing hot as her positive traits were laid out like that, "...you know I'd be nothing without you or my friends."

"Yes, but it was you who chose to make those friends, and accept my guidance; to become the accomplished and storied mare you are today," Celestia said, before standing and approaching her regalia, lifting her crown with her magic and placing it atop her head while putting her golden slippers on, "Come now, we've got an appointment to make, and we're running late."

The duo arrived at the hospital and signed in, with a nurse taking Twilight's vitals, asking a few relevant questions, as well as taking a vial of urine. As Twilight waited in the office with Celestia, eyeing the gynecological chair and ultrasound machine warily, she thought back to last month when her friends had first noticed her growing belly at one of Pinkie's 'Summer Spectacular' parties.

"Hey!" Pinkie said, gently poking Twilight's slightly swollen lower belly, "This part's looking a bit bigger on you, and I know it's not you getting fat! You look totally fit, as always, but just this part is bigger..." Suddenly, Pinkie's eyes widened and she gasped, "Oh-mi-gosh, are you...you totally are! You're pregnant!"

Twilight visibly blanched, though it should have been obvious that Pinkie, of all ponies, would pick up on her not so little, and growing, secret. She was a lot more perceptive than her airheaded, aloof personality may suggest. "I-I...um..." Twilight stammered out, very uneasy about being put in the spotlight like that, her friends all looking at her now.

"Pinkie! Y'all don't jus' go up t' somepony and say they're pregnant!" Applejack said sharply, though she did notice her friend in question was a bit bigger around the lower barrel than usual. Right around where her uterus was, she noted.

All of her friends were looking at her, as though studying her, until Rarity noticed her discomfort and stamped a hoof with a loud clack on the wood floor, startling everypony. "Come now, I would have expected better of you all!" Rarity admonished, "Treating our dear friend as though she's some...some prized breeding sow at the county fair!" She scoffed, before walking over and placing a comforting hoof on Twilight's withers. "If she wished for us to know she's pregnant, IF she's pregnant, I'm sure Twilight would tell us in her own time." Truly, Rarity was as curious as the rest of them about such a major gossip, but she had the good sense to not awkwardly ogle her friend's stomach like the others currently were and make her uncomfortable. Besides, a simple glance from earlier told her detail-oriented mind all she needed to know.

"No, no, it's OK Rarity. It is only equine to be curious, doubly so if it's something major about somepony close to you," Twilight paused, before looking to her friends. "Gals, what I'm going to say next doesn't leave this group, OK?" Twilight said and, after getting nods from the other five mares, let out a sigh and smiled, "We were hoping to wait until a little later, but I guess now is as good of a time as any. I suppose it is pretty obvious, since everypony can clearly see, but yes, I'm pretty sure I am pregnant. We're going to check for sure in a couple weeks when we get the time, and have a foal-viewing if so."

"WOOHOO I WAS RIGHT! TWILIGHT'S GOING TO BE A MOMMY! I HAVE SO MUCH TO PLAN FOR! BUT FIRST, PAAAAAARTAAAAY!"

"OHMIGOSH, THAT'S SO AWESOME!" Rainbow said, her wings flapping excitedly, "Twilight's foal's gonna be so awesome, I know it!"

"I figured out you were carrying earlier, dear, but I didn't want to make a scene and make you uncomfortable," Rarity said with a smile, gently rubbing Twilight's withers, "A fashionista's eyes are good at seeing subtle details and changes, after all."

"Well Ah could tell too. Ain't my first time 'round a pregnant female, pony or otherwise. Got animal husbandry on the farm, an’ a younger sis, af'er all." Applejack said, crossing her forehooves and leaning against a wall.

Fluttershy simply looked in awe at Twilight, eyes wide at the revelation that one of her best friends was pregnant. After a few moments of stunned silence, she let out a little happy squeal, her wings flapping a couple of times in joy. "Yay!" she cheered softly, smiling grandly at her friend.

"So, iffin yer willin' to share, who was the lucky stallion ta have caught yer interest?" Applejack asked, seeing Twilight wince at the question, and getting a glare from Rarity for her bluntness.

"Well...I don't know if they'd want me to share that yet. It's still kind of a secret, as is my pregnancy, since we've only been dating for about a few months now. While they're a wonderful pony, I just want to be sure it’s special somepony wonderful before I start spreading it around. I promise I'll tell you girls later, once everything's figured out," Twilight said, before making an ‘X’ motion over her chest and placing a hoof over her eye, sealing that promise with the Pinkie Promise oath. "Cross my heart and hope to fly, stick a cupcake in my eye."

The rest of the night was spent partying, the party renamed in honor of Twilight’s pregnancy and new relationship.

"Twilight Sparkle?" a mare's voice called out into the waiting room, startling Twilight from her memories. She hadn't noticed, but a mare had entered the doctor's office and quickly bowed, with Celestia smiling and indicating with a hoof for her to rise again.

"Please, stand my dear. Twilight, this is Doctor Crown Jewel, my personal OBGYN physician. She will be the one who will be caring for you during your pregnancy," Celestia said, prompting another short curtsy from the emerald-green mare in the doctor's coat she was indicating, "She has taken the Hooficratic Oath, of course, so nothing that is discussed in this office will be shared outside of you and her under patient/doctor confidentiality."

"Speaking of which," Crown said, her voice soft and gentle, with a faint Manehattenite accent, "I will need your verbal permission to discuss your case while Princess Celestia is present, ruler of Equestria she is or not. Legalities, you understand."

"Yes, of course I grant that," Twilight said simply, getting a nod from the doctor.

"Very well. The pregnancy test, predictably, came back positive, and we're estimating you're about four months along given the information you gave me about the end of your previous estrus cycle." Crown said, reading out of Twilight's file.

"Yes, that seems about right," Twilight said, nodding.

"Alright, so, are you ready to see your baby, Princess?" Crown asked, getting a hesitant nod from Twilight...and oddly to her, a rather eager one from Celestia too. "Good, good. Please just lay on your back and I'll get everything set up. We'll just be doing an abdominal ultrasound today, no need for anything more invasive unless strictly needed."

Twilight did as asked, laying on her back with her forehooves comfortably folded to her chest, hind legs spread and tail up both to maintain her modesty and out of nervousness. She felt incredibly exposed despite, like all ponies, rarely wearing clothes. Feeling her nervousness growing as the doctor rolled over a tray with a screen and a wide, flat paddle-looking device attached to it, and a bottle of clear fluid in some water, Twilight looked to Celestia for guidance as she always had.

"It's alright, my dear." Celestia said, offering her hoof to Twilight and her taking it, giving her mare's fetlock a gentle, comforting squeeze as Crown turned on the monitor.

"I'm going to need you to lower your tail, hun, or it might get in the way," Crown said, before catching herself, "I mean please, Your Highness."

"Please, call me Twilight," Twilight said, reluctantly letting her tail lower and hang over the table's edge, blushing a bit as she felt so vulnerable again. Noticing her mate's discomfort, Celestia gave Twilight's hoof a little squeeze again and, when she looked over to her in response, a soft smile. Twilight felt her nerves dissipate a bit as she was reminded Celestia was right here with her, as always a rock for her.

"OK, perfect Your Hi-Twilight. Now," Crown said, lifting the bottle and applying a healthy dollop of it onto the paddle, "The lubricant gel is going to be a little warm at first, nothing to worry about."

Twilight choked back a yelp as the paddle first pressed to her lower belly, the gel indeed nearly hot, though it quickly cooled. The texture of it - warm, slick, and gooey as it was - brought back memories of another certain similar warm, slippery, thick fluid Celestia liked to squirt on her pregnant belly, making her cheeks flush hotter. She giggled slightly at the ticklish sensation of the paddle gliding over her foal-swollen womb.

"Alright, now I'm going to spread the gel around, do a basic internal exam, and locate the uterus..." Crown said, moving the paddle around while looking at the screen, "Alright, ovaries and fallopian tubes look healthy...no signs of a blastocyst remaining there, a good sign of a successful uterine implantation, now...there's the uterus, perfect. Now, if you both would like to look at the screen, you can help me find your foal."

While there was some static, the image of her uterus was mostly clear, and to the ever-curious Twilight, seeing inside her own womb was awe-inspiring. She knew it was the standard, bicornal equine uterus that all mares had, and that she'd already seen hundreds of times in anatomy or medical books, but something about it being hers that she was seeing made it that much more fascinating. "Alright, switching on the heartbeat sensor..." Crown said, flicking a switch on the machine, and soon a steady, rhythmic beating sounded from the speakers. "...alright, there's mama's heart..." And then a second, more rapid beating sound came, "...and there's foal's."

Then a third, rapid heartbeat came.

The implications obvious, Twilight's jaw hung open as she looked on the screen, a tiny hind hoof coming into view.

"Alright, looks like there's the possibility of twins. Gonna check visually. Do you want to know the gender or genders?" Crown asked and, getting two nods, moved the paddle over Twilight's womb, and the foal within it. Soon, a pair of hind legs showed up on the monitor, then a pelvis. She moved it from between the hind legs and over the crotch, revealing that it was a filly with both a vulva and sheath, up to the abdomen, showing the nubs of wings starting to grow there. As she moved it up more, showing the filly's face....

...there was the starting nub of a horn.

They all heard a clatter as the dropped paddle landed on the exam table, and Twilight's breath caught in her throat as she looked over to Celestia with wide eyes, seeing Celestia equally as surprised at the revelation.

Twilight was carrying an alicorn foal, the second in Equestrian history.

"A-Alright, the foal looks healthy, normally developing at this stage as far as I can tell. I'm not an expert of alicorn prenatal development, of course, but judging by the other tribes' foals..." Crown stammered after a solid minute of silence, shakily picking up and then moving the paddle over more...and another, separate tiny foreleg came on the screen.

As a second foal showed up on a screen, its face was the first thing seen after its foreleg. The horn-nub was clearly there and, almost too eagerly, Crown lowered the paddle down to its barrel. There were wing nubs too. "T-this...this is..." Crown stammered out, looking faint, before lowering the paddle to the second foal's crotch, revealing she had a sheath and vulva both too, just like her twin.

Not only one alicorn foal, but Twilight was carrying alicorn twins.

"A miracle. My miracles," Celestia finished for her, beaming nearly as brightly as her sun as she realized the sheer magnitude of this.

Twilight, meanwhile, felt like she was in a daze as Crown gave her standard maternal advice for carrying twins and a bottle of prenatal vitamins, everything a blur. It wasn't until they were walking back to the castle that Celestia spoke and shook her from that daze. "Twins! I've carried several pairs of twins before, and sired dozens of pairs, but alicorn twins?! This is a first!" Celestia suddenly exclaimed, startling Twilight.

"Oh, um..." Twilight said, all the while having been weighing the odds, and surprised she'd not even considered the possibility of twins, nor the likelihood of two alicorns' gametes meeting actually producing more alicorns. After all, her niece Flurry Heart had been born an alicorn, and only her mother was an alicorn, with Flurry's sire, Twilight's brother Shining Armor, being a unicorn. As she thought about it more, she felt more and more foalish for not considering the possibility. "...yeah, well, it certainly is a surprise!"

"Ooooh, well Luna's sure going to be surprised that she's going to be an auntie to twins! Alicorn twins!" Celestia said, with Twilight never having seen her so excited before, so much so that she was practically pronking down the hallways, akin to what Pinkie Pie may do.

"Well, I'm quite sure she will be, given this is completely unprecedented," Twilight said, still unbelieving of it even as she had the ultrasound pictures in her saddlebag, and the heft of the developing twins in her womb, "Alicorn twins..."

"I knew you were special," Celestia said as they arrived at Canterlot Castle, the guards giving a small bow to them before opening the gates. "This just proves it even more. Come, Luna should be up by now. Shall we tell her just what she's going to be an auntie to?"

"Twins? Twilight is pregnant, with twins, and they're alicorns?" Luna said, her tone one of the expected skepticism, but also of barely-restrained joy, her flittering wings showing said excitement clearly. She looked over to Twilight, who nodded to affirm it true.

"That's right, sister," Celestia said, pulling out the ultrasound pictures and levitating them over to her. "Alicorn twins, both hermaphrodites. The first ever recorded case of them."

"I mean, I had my suspicions that Alicorns could conceive more Alicorns given Flurry Heart's birth, but..." Luna said, her tone very surprised as she hoofed through the several ultrasound pictures of the foals growing within Twilight's womb, "...but this is...this has never happened before!"

Celestia simply smiled, before nuzzling behind Twilight's ear affectionately, "Twilight is most certainly my special mare. I've known that ever since I chose her to join my school as a filly, and she just keeps proving it evermore."

"W-well," Luna said after a few moments of awed silence as she looked over the in-utero pictures of her to-be nieces, "Congratulations to both of you are in order," Luna set the pictures down on the table, before hugging Celestia, then Twilight, "Shall I prepare a foal shower for her? It's been so long since I've been able to, with you hiding that...aspect of who you are for so long, and my...thousand-year absence."

"Oh come now, my dear sister. No need to dwell on the past on the cusp of such a lovely future," Celestia said, smiling to her sister and affectionately rubbing noses with her, "and of course you can host the foal shower. There is nopony else I would prefer for that honor."

Luna smiled, nodding, "For you, sister, and your royal consort, I would indeed be honored to be host to your first foal shower in over a thousand years."

"Thank you, my dear sister. Now," Celestia said, looking at Twilight with the most sensual of eyes, "I think our own, private celebrations are in order, don't you, Twilight?

"Ah, of course, that..." Luna said, giving both of them a knowing look after subtly sniffing the air, and gave Twilight a wink, "I shall leave you to that then. Congratulations again."

With that, Twilight and Celestia left the sitting room they'd met in with Luna and, when out of view of Luna, Celestia swiftly met lips with Twilight and kissed her passionately. "I can smell you from here," Celestia growled huskily into Twilight's ear, earning a shiver from her, "Pregnancy hormones...always making a mare want some ‘loving’, huh? Besides, we did need to celebrate, after all."

All Twilight did was nod and, after ensuring they were alone, turned and flagged her tail aside to let her lover see just how wet and needy she was already, before trotting off towards Celestia's and her shared bedroom. Celestia followed closely, disregarding the puzzled glances from the guards or other castle workers that they passed by in the hallway, with Celestia nearly looking ready to mount Twilight right there in the passageway.

Finally, after a minute that instead felt like a year, Celestia couldn't restrain herself anymore once they passed her bedchamber's threshold and she kicked the door shut with a hind hoof, sealing it with a locking spell that ensured they wouldn't be disturbed. She also lit her horn and removed the concealment spell between her legs, her cock fully erect already, ready to once more claim her mare. After all, tonight was a night of celebration, and both were more than looking forwards to the fireworks.

Author's Note

Twins! Guess the fertility spell and Celestia's virility came together to make quite the boon, eh? Now onto the celebration...