Author's Note

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

-Magical pregnancy progression exercise story. Rainbow Dash is pregnant, with Soarin being the father. She’s following an old exercise book she got from Twilight’s library. Little does she know, the book has an enchantment on it. If a pregnant mare does an exercise designed for later in the pregnancy, the mare’s pregnancy will advance to that point. Not knowing this, Rainbow skips ahead and does an exercise for seven months, and suddenly winds up being seven months pregnant. Surprised by this, but also curious, Rainbow tries exercises for nine months, and becomes nine months pregnant. She then starts to look into exercises designed for twins…

Contains: Feral, Pregnancy, Pregnancy Expansion.

I Got This Idea From an Old British Sitcom

Art by Cosmonaut

“Let’s see, here…” Rainbow examined the old book back and forth, scanning through its contents. “Exercises for the fifth month of pregnancy… exercises for the sixth… seventh… so on… seems legit.”

She yawned and cracked her neck, shaking her shoulders and mane. She’d been so stiff with this pregnancy, and it’d been driving her nuts! Hopefully this exercise book Twilight recommended would help.

Rainbow’s hoof drifted to her slightly distended belly. “Five months in and you’re already being a hassle, kid… ugh.” She looked the book over for a few more minutes before opening it back to the fifth month chapter. She propped it open and moved to the middle of her bedroom, mimicking the movements she saw.

“Hmmm… shoulders high like this—” She straightened as best she could. “Then arch your back like so—ohhhhhh…”

Rainbow closed her eyes. The pose got at just the muscles that’d been giving her trouble, right in the small of her back. She bit back the rest of the moan as she held the pose, the tight muscles loosening, stretttttttching…

A few moments later, Rainbow tried the next pose.

“Mmmm...” Rainbow hummed as she shifted all her weight to one side, crouching and angling her other hooves. The thoracic muscles in her chest slowly pulled out, and it felt like heaven.

A third pose held much the same result. Making Rainbow nearly sag to the floor with relief. By the time she was done with the five poses, she was a very relaxed mare.

“That… was awesome.” Rainbow panted for breath, actually worked up a light sweat from that. She’d been trying to stay active throughout this whole deal, but the first few months had been plagued with morning sickness. It’d only been recently she’d had any non-negative thoughts regarding being pregnant.

Rainbow examined herself in the mirror by her closet. Her mane was full and lustrous, her coat holding a healthy sheen. Her smirk had a gentler look about it, her confident gaze now holding a softness to it. “Hmph. Never thought I’d be the mothering type, but I’m actually… kinda digging this.”

It was the first time she’d admitted it out loud. The thought of foals around had never excited her, but the thought of her foals, her sons and daughters…

Rainbow’s eyes drifted back to the exercise book. She went back over and flipped through it again, looking over the exercises for the next few months. They didn’t look too hard. Most of the forms she was familiar with—

“What the hay…” Rainbow squinted at the section for seven months. “What’s this pose?”

The mare was in a position Rainbow had never seen for an exercise. The book said it was for the seventh month of pregnancy, intended for strengthening your calves. Except Rainbow didn’t really see how.

Curious, Rainbow went back to the middle of the room, doing her best to copy the figure in the book. It suggested that she lay on her side.

“Legs completely stiff…” Rainbow muttered. “Raise hooves to the ceiling, hold for 30 seconds…”

Rainbow didn’t feel much in her calves from the stretch, but a few seconds into the pose, she definitely did feel something else. Her middle began to heat up, feeling warm and tingly. She felt a deep gurgle in her gut, followed by an itch around her navel. Rainbow squeaked, her breath going hitched, her womb feeling like it was submerged in a warm bath. With each exhale of her lungs, a pressure travelled down her belly, making her feel hot and bothered. Little by little, her middle started to swell, bit by bit… gaining centimeter by centimeter as seconds passed...

And then the pressure left her, quickly as it came. Rainbow gasped for air as she went limp, her haggard breaths the only sound in her cloud bedroom.

“What… was that?” Slowly, she sat up, registering increase in weight fighting against her. She looked down at herself with wide eyes, not fully believing what she saw. She ran a hoof down the side of her round paunch, feeling the warm, squishy weight beneath her taut skin. The feathery touch sent a spark through her navel, and she gasped again as her foal kicked, harder than she’d ever felt before.

It was then Rainbow noticed that the exercise book was glowing.

“Oh, horseapples.” Rainbow got herself up with a grunt. She picked up the book and snapped it shut, but the ‘damage’ had already been done.

“Great.” Rainbow threw up her hooves. “Just great! Either I’m having a fever dream, or I likely just pushed my pregnancy up two months! Fantastic!”

Rainbow glowered at the tome for a few minutes, thinking, her wings idly stroking her belly.

“I should get rid of you,” Rainbow said. “Tell Twilight, and turn you back in. You’re nothing but trouble.”

But was it, though?

Rainbow chewed on her lip. Her gaze drifted back over to the mirror, taking in her profile. Her baby bump was a good deal larger, the flutters of her foal more pronounced. She’d never paid much attention to her looks (that sissy stuff was more Rarity’s thing) but she couldn’t help but admit that right now, she looked good.

What would it be like if…

“Hrhrhghghgh…” Rainbow turned her back on the tome. “No! That’s irresponsible! We’re not ready yet!”

Oh, come on. A few more months wouldn’t hurt. You’d be doing things fast!

Rainbow looked back over her shoulder, face scrunched up, eyes squinted.

Soarin was just saying how excited he was to see the baby. He’s been all over you since this whole thing started. Just think you might make him cream his Wonderbolts suit if you strut in front of him with a full baby belly. The look on his face will be priceless!

Without saying anything, Rainbow turned and took a few steps back towards the book.

And you’ll be pulling a fast one on AJ. Wasn’t she just bragging how she was gonna have her foal before you?

Welp, that sealed it.

Carefully, Rainbow picked the book back up and flipped through it’s weathered pages. The magic made no effort to hide itself now, its energy sweeping through her and making her skin prickle. She’d been trying the exercises for the seventh month, right? How about… oh, let’s say… the ninth?

“Hrm…” Rainbow moved to the chapter and glanced it over. The stretches were gentle and unassuming, nothing out of the ordinary. Except, there was one strange pose again, one that didn’t really make any sense…

Rainbow did the pose. She bent her front legs low, stretching out her lumbar. She straightened her rear legs at the same time, at the same time squeezing her pelvic muscles—

“Aahhahahahhhaa…” Rainbow’s mind clouded over. The warm, comforting feeling returned, as if several pairs of hooves were rubbing her down. Her muscles tensed a moment as the pressure began anew, spiking around her throbbing navel. Her breathing grew shallow as the crest of her stomach pushed outward, the precious weight within getting bigger, stronger, healthier.

Rainbow squirmed. The unseen hooves were kneading other spots, too, their touch the herald of more change. Her muscled flanks became padded, a layer of soft fat forming on top. Her hips creaked as they widened, her rear hooves shifting as she had to adjust her stance. A tickling coolness arose just above her marehood, her flat teats filling, the glands beneath swelling with milk. Her gut rocked about now, her navel still plagued by a maddening itch, and it was about to drive Rainbow crazy before—

Pop! The little nub of flesh broke free. Her new outie surged in size, each fresh throb sending tickles and tingles through Rainbow. The pressure soon ended not long after that, leaving breathing hard like she’d run a marathon. But the rest of her body didn’t feel that way at all. She felt giddy, saturated with energy, and as she turned to look back in the mirror…

“Ohhhh, yeah.” Rainbow sauntered towards the mirror with a playful grin. She tossed back her long mane with bedroom eyes, doing a slow twirl to admire herself. “Hey there, sexy mama.”

Rainbow’s pregnant belly was now big and round, not quite yet ready to drop, but getting there. Her foalbearing hips were thick and strong, punctuated by a padded rear that could turn heads a mile away. A pair of plump teats could be seen just on the fringe of her bump, and while they weren’t functional yet, it was only a matter of time.

Rainbow chuckled. She did a few poses, getting a feel for how to move with the new weight. The lean muscle of her athletic body still showed through her maternal changes, accentuating her luscious curves. She was a lithe, lovely mare, rocking the pregnant look with the best of them.

The only thing that could make it better, was if…

Rainbow raised an eyebrow, a thought striking her. She hadn’t fully looked through the table of contents, so maybe…

She returned to the book and looked more closely at the chapter entries, now seeing that they continued past the first two pages. She flipped the page over and saw the remaining entries in the back of the book.

Exercises for a Multiple Pregnancy

Twins……………………….. 235

Triplets……………………… 240

Quadruplets…………………248

Quintuplets………………….253

It went on like that for some time, using names for multiples she’d never even heard of.

A slow smirk crept up on Rainbow’s face. She always did kinda secretly want twins...