Original - https://pastebin.com/5YdjbZak
Behemoth Baby-factory Batpony Botheration

Prompt - http://i.4cdn.org/mlp/1493640166540.png
Princess Luna is approached by a massive (and massively pregnant) batpony breeding an army for Nightmare Moon.

Tags - SFW, Hyper Pregnancy, Macro

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The months following Princess Luna's return had been busy indeed. First she'd needed to catch up with a thousand years of Equestrian history and re-learn how to behave amongst the common ponies - not the easiest of tasks. But then it had also come to light that Nightmare Moon - in the short time that she'd been set loose upon Equestria - had put into motion all manner of backup plans in her mad quest for eternal darkness. The princess of the night, unwilling to allow her unhinged alter-ego even the smallest victory, had personally dedicated herself to thwarting each and every one. And so she had - in a quest fit for a princess she'd sought out Nightmare's twisted schemes and put a stop to them one after another: a night-worshipping cult, a giant deployable sunshade; even an overclocked weather machine designed to shroud Equestria under a blanket of clouds.

A difficult task, but a noble one, and she'd accomplished it all by herself.

At last, one quiet morning, Princess Luna allowed herself to relax. While vigilance would always be needed, all of Nightmare's bizarre plans that she'd managed to track down had finally been put to rest. She sat on the balcony of her temporary lodging, letting the cool air play through her mane, and gazed up at the beautiful starlit sky. In the evening she would return to Canterlot and to her dear sister's side, and for the first time in so, so long, things could be... normal. Even the normally taciturn princess couldn't help but smile at that, closing her eyes and letting her imagination free.

*BOOM*

Luna's ears perked, and she immediately snapped out of her reverie. Something had just hit the ground nearby - something big. Something *very* big, and judging by the thunderous sound of hoofsteps, approaching fast. The princess of the night blinked a few times, slowly coming to terms with exactly what her eyes were telling her. Approaching over the open field was a batpony mare the size of a small castle, slate gray and carrying a substantial paunch. Wide, bright purple eyes the size of wagons were fixed on her, accompanied by a gleeful smile that only widened as the massive pony rumbled closer and closer, wings outstretched in obvious excitement.

"General Moon! General Moon, I found you!"

Even faced with the bizarre and somewhat intimidating sight, Luna had to fight the urge to facehoof above all else. "...oh no."

The gargantuan batpony skidded to a stop, bringing her hooves down on the balcony either side of the princess and annihilating the guardrail. She leaned down close, her smile never wavering, and announced proudly in her shrill and resonant voice, "General Moon! Your secret Bun-in-the-Oven Brigade is ready to deploy! Soon your enemies will know true fear!"

Luna was, for the moment, struck speechless by the strangeness of the situation. While her brain struggled to process exactly what was going on, her eyes took stock of the boisterous, bulbous bat-behemoth, who was wagging her long crimson tail (and hips along with it) like a massive, overexcited puppy. Her cutie mark, a factory building smoking merrily in front of a full moon, was big enough to decorate the wall of a barn. But speaking of size, that paled in comparison to the mare's belly. Now up close, the unavoidable observation was that the giant mare wasn't just chubby, but quite prodigiously pregnant.

The wheels started to turn again in Luna's mind. 'General Moon'? Nightmare's return had been less than a year ago. 'Secret bun-in-the-oven brigade'? A brigade could mean anything between fifteen hundred and four thousand soldiers...

The batpony tilted her head a little. "Don't you remember me, General Moon? It's me, Harvest Moon!" She raised her hoof and saluted, sending planks and splinters from the unfortunate balcony flying in all directions. "Force multiplication specialist, at your service!"

Luna cleared her throat and spoke in her most authoritative tone. "Well met, Harvest Moon. Pray tell, what do you have to report?"

Harvest grinned from tufted ear to tufted ear, sitting back on her haunches with an earthshaking crash and proudly presenting the colossal rounded mass that was her tummy, easily rivalling Luna's opulent dwelling for sheer volume all on its own. "They're almost ready, see? Less than a month, and your batpony army will be born and ready to take over Equestria!" Luna vaguely realised that her guards had arrived to investigate the commotion and were standing slack-jawed in the doorway. Harvest carried on, her enthusiasm invincible. "And then when that's done, you'll be free to complete your master plan and the night - shall last - *forever*!" She threw her head back and belted out a genuinely impressive echo of Nightmare Moon's best villain laugh (at the volume of an approaching freight train). ***"Ahahahaha! Wa-hahahahahahaha!"***

Luna managed to join in with a half-hearted cackle, a cold sweat starting to trail down the back of her neck. "V-very good, Specialist. Just a moment."

"Are you feeling alright, General Moon? You always laugh at that part. You're looking a little pale, too."

"Yes, yes, perfectly fine. Ahahahaha. Ha. Please attend to the brigade while I speak with my gu- ah, *other minions*." Luna turned and leaned in close to her two guards, lowering her voice to a hissed whisper. Judging by the sounds behind her, Harvest was 'attending to the brigade' by uprooting and eating an entire tree. 

"Please contact my sister with all haste. I may need a little help with this one..."