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The Crystal Heir for Sunkit by Draconicon

The Crystal King had little patience for the typical 'traditions' of court. There were some that he enjoyed, particularly those that required those under him to pay obeisance to his power, but most were beyond his interest. The thoughts of being graceful, of paying attention to those beneath him, the idea of tending to the land and ensuring that the kingdom was run well; all of those were for the courtiers and his advisors, not for the King himself.

There was, however, one particular statute that Sombra couldn't escape from, no matter how hard he tried. As King of the Crystal lands, he needed to supply an heir for the throne. Eventually, he would pass - no magic could prevent that - and he needed to have someone left behind to take up the reins and reigns of over the other ponies. If he did not, then the land may fall to someone that couldn't handle it, like the Solar Sisters or someone of their ilk. The mere thought of it left him with a bad taste in his mouth.

However, he was not one interested in seeding mares. While there was the time or two when Sombra had called one to his chambers for a change of pace, none had been interesting or engaging enough for the king to finish with them. He'd always been forced to call upon his slave, Strike - a human that he'd summoned and transformed into a pony - to do the job for him.

Strike...now that was a thought.

King Sombra smiled as he looked out his window, gazing upon the slave pony down in the gardens. The young male was definitely pulling his weight, though not as any normal pony would do. Some of the King's Guards were hard at work 'training' him in how to deal with more meaty blades, and the boy was handling the 'sword swallowing' very well.

Well enough to be riling the King up, in fact. He used a bit of his corrupted magic to stroke his shaft as it grew before he shouted for one of his courtiers.

"Send the slave to my chambers."

"As you wish, Your Majesty."

The pony clopped off down the halls, and Sombra used his magic to whisk himself away.

By the time that Strike had arrived, Sombra had found the spell that he needed, and he smiled as he realized how much more simple his life was about to become. His slave would fulfill yet another vital purpose, and the few people in court that disagreed with him would have their one valid complaint silenced.

The King turned his attention to the pony on the ground, oozing cum from his lips and dripping with sweat. Sombra stomped over to him, and used his magic to lift the smaller male to his hooves.

"It seems you're learning your place well."

"Yes, Master."

"The guards seemed quite eager to train you. Did they start it, or you?"

The blush on the smaller pony's face said it all.

"You saw them and hungered."

"I can't help it, Master. It's like I need to eat cum."

"You don't get enough from me?"

"I-I do, but I get so hungry, and you're busy -"

Sombra raised one front hoof in dismissal. The slave had little right to complain of hunger when he was fed a good four times a day, both in physical meals and as a slave should be. To his relief, the slave didn't push the issue. Much as he didn't like the whining of his slave, he didn't want to punish him, either.

The King circled the brown and blue pony, looking down on him. The rounded rump that the former human had been given as a pony was nearly feminine enough for the King's purposes already, but he knew it would change yet more when the transformation began. Other things would likely change as well, though he knew his slave would remain male. That was where things needed to work; a female would not be enough, and he knew his slave could take his seed where no female could.

When he stood in front of the pony again, he nodded his head in approval.

"You will do well."

"For what, Master?"

"For bearing my heir."

As the slave gasped, Sombra's eyes flashed. He seized hold of his power, and watched as the wisps of smoke surrounded the smaller pony. It slipped about him, rushing into the pony's mouth and under his tail. He saw that his slave's cock began to grow as the smoke pushed past his rim, and Sombra smirked past his magical facade at the reaction his slave was having.

"It seems that you want this, Strike."

"M-master's wants...are my wants."

"Perhaps so. But this was one of your wants long before this, I would wager."

The smoke swelled, pushing into the pony's hole and into his mouth. Strike filled out around the hips, getting wider and thicker, more like a mare's than a pony's or stallion's. His body seemed to grow wider in general around the middle, the pony's frame getting the support it needed to be able to have a baby inside. The King forced the transformation on, even going so far as to leave Strike's hole wet, able to drip with lubricant when the pony was aroused, much like a female might.

Much like he was doing right then, as a matter of fact. King Sombra chuckled at the sight, shaking his head as the magical smoke faded. He walked around and tapped his slave's ass with a hoof.

"You look like a mare in heat, slave."

"I...I feel like one, sir."

"And you will be used like one."

Sombra grunted as he reared up, his cock already emerging from his sheath, and the head hard enough to push past the moistened hole. His slave nearly buckled beneath him, but it had been that way since the first time. Their size difference made it a guarantee every time. But as always, Strike got his balance back, and moaned underneath the King.

Sombra didn't have to move. His cock continued to grow, sliding deeper and deeper into his slave's ass on its own. Bigger and bigger his cock grew, and Strike shuffled and muttered quietly beneath him. Despite the occasional grunts of discomfort from the smaller pony, Sombra knew that the slave enjoyed it. The feeling of tension, the sound of the other pony's cock smacking against his belly, was all the evidence that the Crystal King needed. His slave was a slut for his cock.

When his cock was at full length, Sombra finally slid back. The feeling of his slave's hole around his cock made him moan in pleasure, and he heard his slave answer him with a moan of his own.

"Ready to be bred, slave?"

"Yes master! Please, breed me!"

The King did just that, rapidly humping into the pony's wet hole, fucking him hard and fast. Strike shuddered under him, the smaller pony's knees having difficulty holding them both up, but Sombra showed no mercy. He would have his heir, and his slave would be the one to bear it. The conception would happen tonight.

Growling, he bared his teeth as he rode his slave, pushing him harder and harder with deep, hard thrusts of his cock. His balls swung forward, slapping against the slave's smaller, more meager pair with every thrust. Sombra panted and moaned as the hole tightened around him, squeezing around the base of his cock every time he sheathed himself in that hot little hole. It was as good as ever.

"I'm close, my slave."

"Cum in me, Master! Please, please cum in me!"

The King could not deny his slave such a request. With a moan deep in his chest, the king of the crystal lands slammed his cock in up to the hilt. His balls drew up, and his cock throbbed as he shot his load into the smaller pony below him. He grinned, already feeling his magic collect the seed and take it where it needed to go.

Dismounting his slut as he was still cumming, the king let the last shot land on the slave's rump. It left a white mark in his fur, and Sombra chuckled.

"You are forbidden from cleaning that off."

Three months later, and Strike's belly had swelled to immense size. It was past the size of the average pregnant mare, showing that the spell had worked better than even the Crystal King had expected it to. Sombra smiled as he watched the former stallion waddle about the palace, enjoying the sight of his slave needing cum and the seed of his betters more than ever before, feeding himself and the heir that was to come.

It wasn't until the fifth month that the child was finally born. It slipped free of the slave's asshole with a slip and a pop, and the young pony lay behind the 'mare' that had carried it for so long. Sombra had it taken to the nursery, and stood over his slave.

"You did well, slave."

"T-thank you, master."

"Now we'll have to do it again."

The slave blinked, turning to stare at him as he panted.

"W-what?"

"I have one heir. As king, I need several. On your hooves, slave."

"But I just -"

"On your hooves!"

Strike jumped at the sudden shout from the king, turning around and presenting himself. Despite the birth, it was clear that the pony was eagerly awaiting another fuck from the King, and Sombra was happy to give it.

He was, admittedly, a little disappointed at the feeling of such looseness after the birth, but he supposed that it was unavoidable. Still, it was easy to slide in, and he was able to fuck his slut hard right from the start.

"I plan on at least four heirs, slave. I hope you are up to the task of birthing them."

The End