Author's Note

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

Rarity is pregnant again, this time with twelve foals. The compatibility and fertility of dragons and ponies is no longer in question, and the effects of which have been having an interesting effect on Rarity’s body. Dragon magic has started to intermingle with her own, bonding her to Spike and allowing him to be of equal size to mate with him no matter how big he grows. Which is good, because Spike has started growing more and more as days past, the power of the Elements starting to affect him as well. Now with both of them growing larger by the day with no sign of stopping, they have one last romp on their old bed before they both outgrow it.

Contains: Pony, Macro, Hyper Pregnancy, Lactation, Power Absorption

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“There you are.” Rarity said as she teleported into her and Spike’s old bedroom. “Couldn’t help but measure yourself one last time, eh?”

It was moving weekend. Boxes were piled up and ready to be moved, just about everything taken off the walls, dust all over the place forming odd lines and creases on the floor. Their furniture had already been taken to the new house, the only things left now being a few hanging pictures, a mostly-emptied out dresser, and of course, her and Spike’s first bed, which had been little more than a decoration for a while now.

Spike’s laugh was a low rumble. His voice had gotten deeper and stronger over the years, yet it still carried the warmth it always had. “Yeah, I suppose.” He ran a claw along the pen marks signifying his and Rarity’s height measurements, each one taken at the shoulder. They’d been growing like weeds ever since undergoing the mystical dragon rite of marriage—an ancient soul-bonding ritual that made them compatible in every way. “Hard to believe I was ever this small.”

Rarity smiled. Her own measurements were always half a head taller than Spike’s, their relative size difference always proportionately the same. She still found it hard to believe she’d become the tallest pony in Equestria. “We could always remove that section of the wall and take it with us. We have friends with carpentry skills.”

Spike snorted. He marked his latest standing height with a green marker, then compared it to the last measurement with a ruler. “Three inches taller, one and a half inches wider, seven inches longer nose to tail. Not bad.”

Rarity couldn’t help but agree. Ever since they’d been wed, the Element of Generosity’s power had been reacting in an odd way, enhancing them even further with no sign of stopping. Spike was marvelous specimen of a drake, fierce and handsome, with marvelously wide wings, deep green spines, a lithe, sleek frame rippling with primal muscle, and shining purple scales that made her heart skip a beat. His keen claws and razor-sharp spines were quite dangerous, but a simple spell kept them sheathed in protective magic—

“Ahhhhhh~” Spike stretched himself out. He made no effort to conceal something that wasn’t sheathed at the moment, his hefty tapered cock hard and stuck up straight and grazing his ribs. His whole length twitched as she looked on, a thick bead of pre dripping off to join a puddle on the floor. “You sure you want to keep the bed here? I’m sure we could find a use for it.”

Rarity smirked. “Maybe I want to find a use for it now, hmm?” Her horn nearly grazed the ceiling as she made her way towards Spike like she was moving underwater. “Maybe I kept it here on purpose so we could use it one last time.”

The bed in question was an enormous four-poster with tall bronze banisters. They hadn’t been able to fit in it since Rarity been six months pregnant with the septuplets, and considering they’d both almost tripled in size since then, AND with Rarity ten months pregnant with duodecaplets...

Spike licked his lips. You could see how taut Rarity’s barrel was, how full, lively and burgeoning with their twelve newest additions..The soft light made her seem like she swelled larger with every breath, and with them both growing more fecund by the day, they both knew this was only the beginning. It was a marvel to see her move these days, the firm, warm mass of her pregnant belly swaying like a fluffy zeppelin. She needed a spell to keep her skin protected as it grazed the floor, their big, strong dragon-foals asleep within her nourishing womb.

Rarity nestled herself into Spike’s strong embrace. They started off slow—tender nuzzles, soft kisses, light touches here and there. Spike’s polished scales were warm and smooth against Rarity’s healthy coat, and now she was shivering as he pressed his lips to her neck. She could feel the hardness of his teeth just behind, and her tail raised high at the thought of his dagger-like fangs. Spike’s kisses then trailed south, licking and snuffling, trailing across her body until he got to her protruding stomach. He made a strange sound then, a low growl like a cat’s purr.

“They recognize you,” Rarity said, feeling flutters within her gut.

Spike hummed. He ran his claws and face all along her side, whispering and purring, kissing and massaging. More flutters soon followed, and Spike spread his great wings and wrapped around them around Rarity in full. She could only chuckle as one wing covered a window, tinting the evening sunlight green.

But it wasn’t long before she wanted more. The familiar scent of Spike’s body called to her, amplified by his excitement and mixing with hers. Their warm, large bodies had upped the room’s temperature by several degrees, and it was only growing hotter as Spike puffed out jets of flame to provide their foals some dragon magic. His tingly fire was like heaven on Rarity’s skin, but she wanted more… much more. She coaxed Spike to his feet and pulled him into a hungry kiss, and he responded by breathing green fire directly down her throat in a rush of power.

“Mmmmhhhh~” Rarity soaked up the draconic magic in an instant, and he kept feeding her more and more, only coming up for air before giving her another great dose. She could feel the raw energy suffusing her, coursing through her veins like adrenaline… but even so, it wasn’t enough. She gripped Spike and deepened their kiss even more, and he answered by cupping her head in his claws and unleashing a full blast of fire…

Rarity’s eyes rolled back. Her marehood dripped as she drank in the power without end, all of it surging into her fertile womb. Their precious dozen foals had all grown big and strong thanks to their love and care, and soon she’d be pregnant again, likely with even more considering the test results they’d got back.

They wound up moving to the bed at some point. Spike crawled on first, laying on his back with his wings dangling far over the sides. Rarity took a moment to admire his fat cock, his knot pulsing in time with his thudding heart. His full, musky balls swelled larger by the day, the virile seed within growing ever-more potent, and in a few short months that seed would be taking root inside her once more. She eased onto the bed and stepped over him with a fluid motion, the springs and frame creaking as they took on more and more of her pregnant weight.

Rarity only just fit beneath the four poster canopy now. She had to take care to keep her head and horn down, her shoulders, back, and rump straining the fabric top as it was. Spike groaned as he was pushed, deep, deep into the mattress, his pregnant wife and the dozen lives within her settling on his chest, torso, and hips. Rarity’s barrel alone was bigger than all of he was, and the realization made him harder than ever as she planted her legs on either side of his him.

“My, my,” said Rarity, a puff of flame escaping her lips. “Certainly a far cry from the first time we made love here, isn’t it? There won’t be a bed in the world that’ll hold both of us at this rate…”

Spike was quivering. He could feel Rarity’s warm arousal dripping on his tail, as well as milk droplets from her head-sized breasts. Their tails grew entwined to pull and squeeze, and Spike stroked Rarity’s white womb while looking into her eyes. She bent her head down to meet his desperate lips, her horn glowing to magically stroke his length—

It was too much. Spike massive balls bloating larger than ever, and dragonfire erupted from his throat to flow down Rarity’s in a great stream. Their lower halves became coated in piping hot cum as the tight, clenched spring inside Spike exploded like a bomb, and Rarity moaned louder than ever as she became awash in fresh, tingling power. She kept pumping his dick throughout his orgasm, grinding her mammoth belly on him as the bed—

CRUNCH!

Rarity and Spike felt the bed frame give beneath them. The banisters of the four poster became uneven, and the jolt bent several of the mattress springs with a metallic screech. Both the headboard and the footboard snapped as the entire bed buckled in on itself, yet neither Rarity nor Spike ever stopped what they were doing, their thoughts consumed by one another, making out for minutes while Rarity brought Spike to climax after climax.

They wound up burning the bed afterwards.