Had to split it up to two different submissions, due to its size. If you have downloaded part 2, it is all in there.
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With a rude awakening however. He felt as if he had overdone on some cider. A complete hangover. He rememberd something about eating, but not all to much. However, as he tried to get up, he noticed it to be impossible. His stomach had grown even more than before, making it unable for his hooves to reach around it. And even if, his legs had gotten so round, that they appeared to be far more stubbier. His cheeks were big and poofy, the neck chubby and flabby. The only little improvement, was that his hind was far more like a cushion, spreading out from over the one side of the bed. At least that let him sit somewhat comfy.

It took him a moment to realize, that he had slept a day long apparently, as the morning sun was shining through the window. And.. the entire castle smelled like there was a great breakfast being made.
Suddenly, there was a cold feeling of something being wrapped around his middle. He wobbled around slightly to figure out what it was, eeping at it.

“Oh!” a crystal pony jumped back, a measuring tape between her hooves. “Pardon me, my prince. I was taking your measurments. I thought you were still asleep.”

He squinted at the crystal mare, before huffing his reply. “What is even going on here? Is this some kind of prank?”

The mare chuckled and waved a hoof. “Oh, no no! You are becoming our new master record in wealth! Just look at how big you have become in just a few days! It must be your true destiny!”

“What?” he huffed angrily, yet had to catch his breath before continueing. “What are you even talking about? Since when is becoming immobile someponies destiny!?”

“Oh dear, nopony told you what it means to be the crystal princesses husband?” she smiled regardless. “In the Crystal Empire, our love is shown by the heart of the princess and the belly of the prince! Or did you think that ‘Love goes through the stomach’ is just a saying?”
the mare hopped off of the bed, taking a good look at it as well.
“You see, each time the new princess marries, her husband will be given the greatest goods from our fields and trades. It is our way to thank our royals for bringing about our happiness! And the more the prince gains from these goods, the greater our love is!”

Shining Armors face just stared at the crystal mare in dread. “But.. I can’t move anymore. Ain’t I big enough to show the love for the empire?!”
“Oh, in our eyes, you are even far bigger than our last prince already! But Princess Cadence insists on going on. She said, that she truely wants to show just how good we are doing!”

The stallion began to jiggle around, in the attempt to get up and perhaps waddle away. But it was no use. Even if he were to get up, he would most likely only be able to roll away.
“No..! This got to be a bad dream.. or prank! Cadence would never do such a thing to me!”

“Your higness, calm down! This is a good thing!” the mare tried to reassure him, yet the attempts were causing more harm than good.

“No!” Shining Armor protested, already nearly breathless. “This is sick! I don’t want to become any...” he widend his eyes, as his wife stood at the doorway, along with several crystal ponies behind her, carrying dishes with divinely smelling food.

The mare bowed to her princess, making room for her. Cadence wanderd right over to her husband, her eyes sternly locked on to his.

“Shining Armor. Why are you acting like this in front of the entire kingdom? I thought you promised to do whatever needed, in order to help the kingdom!”

“I was!” he whined back “But I didn’t know it included me becoming.. well.. this!” he waved his stubby front legs, before making his stomachs fat ripple with a few not so well placed claps against it.

The crystal ponies set the dishes on to the tables, piling up the food and preparing it for yet another eating session. Cadence sighed.

“You love me, don’t you? And all these crystal ponies, that want to do nothing more than show you their love, the only way they know.” she waved one crystal pony over, that held a dish of sugary crystal berries. “We will lead the Empire into a new era of happiness. And in order to show the world that we are truely remarkable, you will have to become even grander as you are now. That is just.. the way.. it is..” she smiled gently as her horn glowed up.

He knew what was going to follow, but before he could defend himself, he was struck once again by the power of love. Becoming the obiedient prince that everyone wanted him to be.

“Crystal ponies.” Cadence turned to her citizens “This will be a grand future, for us all. Today, you may give him your offerings. He will love them, I am sure!”

The ponies cheered and had a great time, giving their prince the food they had all made with deepest care and love, watching Shining Armor grow during the offered meals, as he effortlessly munched them down. They took turns, creating an almost endless flow of food, for the loving, everhungry stomach that they wished nothing more but to fill up to the tip.
His wife used the quieter times, to feed him herself, enjoying every little moment of it.

Soon enough, he was moved to a new location, to make sure that he could continue to eat and grow, beyond their wildest dreams. The Crystal Empire was a fertile place, assuring that he would most likely never stop gaining more loveable fat. And he was surely something impressive to see. His stomach was now wide and stretched out, his frontlegs but mere stubs, cozily pressed into his sides, the flanks of his were round and sturdy, yet hung over his hindlegs more and more as he continued his gain. His face had become unbelieveably round, with squishable cheeks and a thick, flabby, yet almost nonexistent neck framed his face.

Every day, his wife would have to remind him of his true destiny, of being the grand prince of the Empire, even though his complaints became less and less with each passing day.
Though some visitors of the Empire did not understand this custom, they did also bring their best dishes with to have them be fed to the stallion, alone out of respect and to show that they still loved the Empire for what it was.

Weeks passed, and Cadence found herself standing on her balcony, her gaze looking towards the large building they had fixed up for her hubby.
A familiar crystal pony mare joined her, bowing at first, before speaking up.

“Your highness?” she smiled up to the pink alicorn.

“Yes, my dearest citizen?” she returned the happy smile.

“It is time. You have fullfilled all requirements that there were to fullfill. You proved yourself worthy to be our princess. You brought back our happiness and pushed it to new heights. You made us have a place in the world again and you let the prince show this, far beyond any other Princess has ever done.” The mare sighed happily. “You are now worthy to become our Queen.”

Cadence chuckled in delight and gave the crystal mare a hug. “This is a big honour for me. And believe me, I will continue to let our happiness grow.” she looked back to her husbands building one last time, before following the crystal pony back into the castle. “My love for him and you all, is after all, neverending.”