Hypothesis: Foals

The castle stood silent, not a single soul in all it’s halls. A peaceful sight for all inside. Though there was only one mare to appreciate it, a single mare enjoying a warm cup of tea and a nice book. The pink mare’s ear flicked as she heard a belaboured breath approach on the other side of the foyer. Starlight looked up as she saw Twilight stagger through the door landing roughly on her side.

Without even getting up, she rolled her eyes and laid down her book. She stared across at the alicorn laid splayed on the sofa she’d moved there about a month back. Twilight had only gotten more and more lethargic as the days went on, any movement was slow and prone to tiring. Starlight was half convinced she was putting on an act.

Twilight pulled off her saddle bags, a small wince every time her hooves touched the ground.

Well, she did say half convinced. “You alright Twi?”

The Princess looked up at her, exhaustion clear as day on her face, “I’m fine Starlight. Just pushed myself a bit hard today. The growing pains were worse today”

Growing pains.., Starlight thought to herself, It’s more than that twilight, why won’t you open up

She’d been complaining about alicorn growth pains for months now. After meeting with Celestia she’d come back saying that her body was growing to match the royal sisters. But Starlight wasn’t convinced. Why now? Why not back when she first transformed? Any attempt at finding out more was met with rebuffs.

A wave of purple magic washed over Twilight’s hooves, slowly pulsing over each one in turn. Another habit she’d picked up…

Starlight sighed and picked her book back up again, she’d been through getting a straight answer out of her. All she wanted to do was get back to relaxing in peace, her mind off of one of her best friend’s actions. She was less than successful.

Twilight picked herself off of the sofa, her hooves now rested enough for her to trek deeper into the castle. She gave a short goodbye to starlight who was deep in her book, and slowly trotted down the hall.

It was a big castle, half the rooms she swore she’d never use. With a short look behind herself, she ducked into one of the side rooms. From the outside it looked like nothing special, exactly how she wanted it. The inside on the other hand was far from normal.

Large beams crossed the room, tools haphazardly thrown around the place, and random garbage littered the room. But none of that captured her attention, she walked with determination towards the hole in the middle. It was a rough hole, the edges clearly hand sawn with chunks of crystal randomly removed.

Twilight slowly stepped down the crude staircase, the spell that she had been holding all day finally dispelling. Her bloated stomach slowly materialising from behind the magical cloak. It wasn’t a hard spell, but it had to be perfect. She couldn’t let it slip for even a moment, or else all would go to waste.

Going deeper through the tunnel, she had to duck on several occasions so as to not bump her horn. She was once again thankful towards the friendship tree, she’d never have been able to do this back in the library. With one more duck she was able to enter into a large cavernous room just as makeshift as the last. This one featuring several beds and cots, an ultrasound scanner, and whatever small decorations she was able to sneak in.

Twilight slowly raised herself onto the bed, pulling the scanner close to her with her magic. She splayed herself out on her back, letting her hooves dangle to her side. With a tiny bit of gel on the tip she pressed the probe against her belly. Eyes locked onto the monitor, she looked over the twin forms of foals slowly shifting around inside of her.

She let the probe fall as a smile crossed her face, she’d never counted her luck as much as she did the day she got the news. She had danced around for joy in the small bathroom she was in, silently swinging her hooves from side to side. And still, nearly 11 months later, she had a hard time believing what that meant.

Twilight brought a hoof up to rub her stomach, the small kicks of her foals slowly smacking against her. Her secret foals, hidden from the world and to be born under a tree. And what they’d do after that… She moved her hoof further down, her folds already slick with arousal.

A squirt of liquid shot out over her hoof.

It took a moment for her to realise what that meant. But once she did she sat up in a fright. 11 months. With her magic she reached for a towel that she kept specifically for this purpose. She felt more liquid begin to squirt, an almost uncomfortable amount spraying over the crystal floor. Twilight moaned in a combination of arousal and pain, as her stomach began deflating outlining the foals inside clearer.

Though it wouldn’t be for long as she began involuntarily contracting. The two foals began flowing achingly slowly through a hole that was normally the size of half of one. Twi’s magic flared involuntarily, casting unformed ether out into the world as she squirmed in pain. She’d tried her best to prepare, but the sheer pain was unlike anything she’d experienced before.

She felt the bulge shift lower and lower, getting closer and closer to the end of the tunnel. Twilight’s eyes were clamped shut as she clenched as many muscles as she could to try and either ease the pain or speed the birth. But it felt like neither worked, despite her best research she was forced to endure.

After what felt like an eternity, she felt the bulge crest daylight. Or at least what counted as daylight. Without the walls of her insides to hold it back, the amniotic sack burst forward to land at the foot of her bed. And like that, there was quiet.

For about a couple seconds.

The sound of a pair of foals screaming broke Twi out of her stupor, rushing forward to pull the newborns out of the bodily sack. A filly and a colt. Pride was the word on her mind as she held her foals close to her, she was a proud mother holding her kin. They’d scream for now, but they’d stop.

Then, the fun would begin.