Author's Note

This is intended as an idea dump of sorts for my own story concepts. Please do not solicit your own ideas.

Prompt: Princess Celestia is incredibly fertile. Every time she has sex with a stallion, she becomes pregnant with a new foal. This can happen even while she’s pregnant. If she’s already pregnant, the other foals halt in their gestation until the new foal catches up. Celestia greatly enjoys the feeling of being pregnant, so she waits until the last month of her latest pregnancy, then has sex with a new stallion to keep herself pregnant. Years go by with her becoming more and more pregnant, never actually giving birth.

Contains: Feral, Sex, Hyper Pregnancy.

Superfetation? More Like Ultrafetation

Art by Leovictor.

“Ah!” The stallion on top of her thrust into her over and over, his hips meeting hers with a meaty SLAP! Celestia arched her back more to give him a better angle, the tightness in her core building.

“Yes…” Celestia panted for breath, rivulets of sweat running down her face. “Yes!”

Her swollen belly swayed with his every thrust, heavy with two growing foals. Her foals. She still couldn’t believe it was real. She could feel them kicking, tiny little flutters racing through her, pressing against the walls of her womb.

The stallion—one of her older attendants—was standing on his tippy-hooves to mount her, whispering sweet nothings in her ear. He’d served her faithfully for so long… she didn’t want him to go. But if she couldn’t stop that, then maybe he could give her a little something to remember him by…

“Harder…” Celestia squeezed her muscles, clamping down on him. “Harder!”

The stallion obeyed. He bit down on her mane and pulled, causing her to scream out his name. The tight spring inside her was coiled SO tight now, all she needed was that little push.

“Tia…” The stallion whispered, licking and tugging her scruff. “My Princess…”

In her belly, she could feel it starting again. That warm, glowing, feeling of light, spreading out like fire through her veins. The foals inside her were slowing down, becoming more placid. Inside her, a new egg slipped into her fertile womb, glowing with strange magic.

The stallion’s thrusts became uneven and jerky. He moved in and out of her without hesitance, losing himself to his need. His balls were twitching, bloated with fresh seed, and with one final, mighty thrust, his cock flared inside her—

“AH!” The stallion came, his seed flooding Celestia’s willing tunnel. His cum splattered the sealed entrance of her womb, but then… phased right through it, as if the barrier were an illusion. Inside, his essence found Celestia’s glowing egg, seeding it thoroughly, the excess burning away.

Celestia felt it. She felt it ALL. The instant he impregnated her, her two other foals became enshrouded in a golden glow, not moving so much as an inch. Time stood still for them as their sibling-to-be took root, nestling in their mother’s nourishing womb.

“Mmm…” Celestia’s mane was hot and sticky, the flowing colors blending together. She turned her head to kiss her lover, their tongues dancing together. “Thank you, my dear… Thank you.”

The stallion hugged her tight, rubbing the sides of her taut belly. “Anything… for my Princess.”

Ten Months Later-

“You…” the young guard gulped. “You want me?”

Celestia beckoned him closer, her come-hither stare drawing him in. “I’ve seen the way you look at me. You can’t stop staring.”

The young guard didn’t deny it. His princess was a fertile goddess, her enormous belly almost as large as him. The way she walked with it was hypnotic—that round, gravid weight slowly moving, snugly tucked between her feathery wings. When he walked behind her, he got a full view of her hefty breasts, each one the size of his head, occasionally dripping with sweet-smelling milk.

“It’s just…” the young guard struggled to find words. “You’re… so beautiful…”

Celestia grinned. She laid back on her bed, stretching and letting him see everything. “Why, thank you. It’s good to know some of my new guards have such good taste.”

She knew everything about this young stallion—his lineage, his health, his performance. And to top it off, he got a boner every time she walked past him. All traits she could appreciate.

“I need your help, soldier,” Celestia said in a coy voice. “There’s something I’d like you to do, and only you can do it for me…”

The young guard was drooling. He ogled every aspect of her divine form--her ivory coat so pure, her fair, wise face, her wings so big and long, her mane and tail waving contrails of color. Her belly was definitely a contender for what he liked most, but that award went to her eyes. Piercing, deep, and calm, they were a striking color of magenta that made his heart skip a beat.

“Anything,” he murmured.

With a slow roll, Celestia moved onto her side. Her triplet-filled womb bounced a bit, the foals within safe and secure. She lifted her tail and presented her dripping cunny, fanning him with her scent.

“Make love to me,” she whispered. “I see that lust in your eyes, and I WANT it. Show it to me!”

The young guard had never been harder in his life. The scent of aroused mare washed over him, and he was drawn to it like a bee to honey. Carefully, he climbed up onto the bed beside her, then began nuzzling and peppering her with kisses, his throbbing cock wedged between them.

Celestia smiled. Yes, she knew she’d chosen well. He’d make her even bigger and fuller with child…

Ten and a half months later-

“Big Macintosh, wasn’t it?” Celestia said. “Well, I certainly see why you got the name.”

Big Mac’s stoic face betrayed nothing. He merely bowed before his Princess, his eyes glued to the floor.

Celestia examined him. He was a nice shade of red, with an impressive physique. He was also one of the tallest stallions she’d ever seen. His eyes about level with her chin!

“I’ve heard tell that you’re quite experienced with plowing fields,” Celestia said. She kept her voice calm, level, the same tone that always placated her little ponies. “I thought maybe you could help me with one.”

Big Mac hesitated. He dared look up a moment, his head cocked to the side. “Pardon?”

Celestia grinned. “You’re a farmer, aren’t you? I assume you’re quite experienced with seeding fertile fields.”

Big Mac raised an eyebrow. Either he was dreaming, or he’d stumbled into a bad porno movie. “Uh… yeah, I s’pose.”

Celestia bade him to rise. She could see the glint of recognition in his eyes, dubious, but there all the same. “I have a field that’s in need of a thorough plowing. I’ve been searching for a strong, capable stallion to do it for me, but I haven’t yet found a good fit. Perhaps you can be the one to fill the need…”

Big Mac could feel his loins twitching. His princess, a veritable goddess of maternity, was really asking him to…?

“Are you interested?” Celestia asked. She took his hoof and guided it to her gigantic barrel, letting him feel it’s warmth. The four foals within moved errantly, now all awake and not frozen in time that they were all caught up. They were all safe inside her, their constant twitches so exciting, ready to soon be born.

But there was no rush for that just yet…

Big Mac could now see the color in Celestia’s cheeks. She was panting, a hunger in her gaze that re-routed all the blood to his groin. His long, thick cock slipped out its sheath, it’s flat head already turning slick.

“Eeyup.” Boldly, Big Mac closed the distance, nuzzling Celestia’s long neck. “Just to warn ya, though—when an Apple plows a field, we plow it good. Ya might wind up gettin’ more than ya bargained for…”

Celestia shivered. She buried her nose in his mane, inhaling deep his scent. He smelled like sweet straw, and just from his nuzzling, she could feel the power, the strength in his corded muscles. “I’ll take you up on that.”

Big Mac chuckled. “Don’t say I didn’t warn ya.”

Nine Months Later-

“Luna,” Celestia called. “LUNA!”

No response. Either her sister hadn’t heard, or she was busy with something.

“Damn it…” Grunting, Celestia struggled to her hooves, every step a challenge. Her bulbous, burgeoning womb grazed the floor with every step, quickly leaving her a winded mess.

Somehow, she made it to her desk. Stupid enchanted scrolls couldn’t be summoned with magic, and it was annoying as all Tartarus. Grumbling under her breath, Celestia pulled out an ink and quill and began to write.

Spike-

Please pass this letter along to Big Macintosh. Thank you.

Celestia paused to cast a quick enchantment. Now, the rest could only be read by one other pony.

Mac-

Thank you very much for the latest shipment of non-alcoholic cider. It was delicious, and it was just the thing to satisfy my cravings. The—

THUMP!

“GAH!” Celestia felt like she’d been punched in the gut. A noticeable bulge in her belly had stretched out, shaped in the form of a hoof.

“Little gremlins,” Celestia said. Gingerly rubbing her side, she continued.

—foals are doing well, and we’ve at last narrowed down how many there actually are.

Celestia took a moment to collect her thoughts. She still couldn’t quite believe this herself, but to be fair, he HAD warned her.

Seven. You got me pregnant with SEVEN foals, Mac. They’re all strong, able-bodied things, too. They keep using my insides as a punching bag!

Celestia rubbed her temples. She stymied her anger, looking down at the stretched, engorged sphere that was her womb. She could only just envelop the whole thing with her wings. It was the size of two full-grown stallions, her eleven children soon ready to enter the world.

To answer the first of your earlier questions—that’s entirely up to you. If you wish to come up here to Canterlot to be with the kids, that can certainly be arranged. There’s a small plateau on the mountainside that I Lulu and I could work to make into a farmland, perhaps that would be to your liking.

Celestia’s thoughts wandered to the other four fathers of her children. Their responses had been varied, but they were under no obligation to ‘take responsibility’. She was quite fine with raising them all herself.

As for the second question… It’s been some time since I’ve taken a consort. You’d be the first in four hundred years, and it would be life changing for you. Are you sure you’re able to handle that?

Celestia closed her eyes. For a few minutes, she lost herself in the warmth blooming in her body, the contentment that pulsed out from her womb. It was laced with a pleasant tingling—anticipation for what was to come.

Think hard on this, Mac. I care deeply for you, and I don’t want you to feel forced into a decision. Being with me comes with a price. You’re smart, my sweet. Don’t be blinded by love.

Focusing, Celestia summoned forth a small, white box. In it were a collection of phoenix feathers, warm to the touch and smelling like burning wood. She placed one of these inside the scroll, attaching it to the side.

In either case, I wish you well. I look forward to your reply.

-Tia