I decided that I'd finally publish some writing to here, and I'm pretty happy with how this turned out, so I hope you enjoy! (Warning: Contains weight gain)

Eric is this guy: http://www.furaffinity.net/view/26681837/

Also, sidenote, there may be some grammar and spelling errors in the pdf version. There shouldn't be any in the description version though.

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"Ah, good. It appears as though your senses are returning." The strange, mechanical words echoed throughout Eric's mind, slowly bringing the donkey to his senses. "W-What? Where... Am I?" Eric said with a slight slur.

The donkey could feel his arms being pressed against metal, tied by what felt like a rope. He squinted in the darkness but was only able to make out the silhouette of what appeared to be a rabbit. "Sir, I am pleased to inform you that you have been selected-" The voice cut off suddenly, replaced by the grating sound of grinding gears. Suddenly, a warm, electric blue glow illuminated my surroundings. I felt my eyes widen as I finally saw the speaker with my own eyes.

The strange, rabbit-like automaton before me continued with, "-for the first trial run of the Fulfiller Mk4!" The creature's glowing green eyes peered at me, and it's shining aluminum teeth were suddenly completely visible against its copper skin, as it's face contorted into a wide grin. "Ah, there is much to work with here."

"Wait- Who are you? And what do you mean, trial?" Eric said, with a hint of irritation, his dazed slur having vanished.

"As I said, sir, I am the Fulfiller Mk4. I have been created by the Alchemist to make his work much easier. You were handpicked by the alchemist for this experiment, and you shall be compensated accordingly once the experiment is finished." The Fulfiller said in a chipper, mechanical voice. "All of the trials will be recorded for observation. Now, to begin, we will show an initial composition. Suddenly, the rabbit's eyes flashed a bright tint of blue for a split second, causing Eric to recoil, his eyes momentarily blinded by the light. "Hey, just what do you think you're-" Eric said as his eyes readjusted, before taking in the image before him. It was - him.

It almost looked like a still version of a mirror, surrounded by various symbols and words. The donkey had never seen anything like it before. In the image, he was standing with his arms spread out, making him resemble a "T". In addition, there were various angles of said "T" pose located beside the initial image. He had never seen such a detailed image of himself before. The distinct contrast of his white belly fur and his reddish-brown body fur was clear throughout his form, as was the distinct purple hue of his eyes and the white of his nose. The Donkey was wearing a loose, tan cloth tunic which rounded outward slightly at the peak of his stomach. His gray-tipped tail flowed outward from his loose white trousers, which were held up by a secure leather belt. While the donkey would typically be wearing a straw hat, his head was bear, revealing his jagged brown hair. Eric could just make out a few of the statistics besides the images, including "Height: 5'11" and "Weight: 176 pounds."

"As you can see, we have taken some basic information on your physique before we begin. Now, if you agree to the experiment, I will readjust your surroundings, allowing you to be more comfortable." The grinning automaton said.

"Seeing as you already have me bound to an iron chair, why would you need my consent for this... experiment?" The donkey asked.

"Why, once you give consent, we will give you proper compensation. Otherwise, we will have to perform our experiments without paying you. The pay you receive is proportionate to the number of trials performed, as well as the severity of said trials. The recommended amount for you to choose is 200 gold. But, we would be happy to raise the number to 500 gold, if the subject would desire it." The Fulfiller said chipperly.

Eric felt his jaw drop. "Wait... 500 gold?! All for my consent?"

The Fulfiller began, "As I said sir, the severity of the trials is proportionate to the payment-"

"Yes! A thousand times, yes!" The donkey yelled eagerly. With that amount of money, the donkey would be able to feed himself for years.

"That is wonderful to hear sir!" The Fulfiller said, the static in its voice rising as a gargantuan silver throne rose up beside the automaton. "A-All you have to do to s-s-start the experiment is sit in the seat!"

The rope binding Eric fell down instantly, the enchantment that had been holding it dissipating. The jackass was oblivious to the rising discrepancies in the efficient machine since he was far more focused on plopping his own ass in the massive seat. Once he sat in it, he took in how utterly massive the throne was. It was more of a luxuriant bench than a throne, as it appeared as though a dozen people could sit on the throne with no issues. The donkey no longer cared what the experiments entailed - the promise of wealth was too much for him.

"T-Thank you for giving your consent 1,001 times. We will now multiply the duration and severity of the trials by 1,001 times. W-We hope you do enjoy." The clearly malfunctioning machine said.

"Wait... What?" The donkey said as a small plate with a sphere and a jug of water suddenly appeared out of thin air, levitating in front of the donkey.

"Do not worry sir. For the first trial, you will be testing a new type of compact food known as Packaberries. The effects of the food will take place when liquid is consumed." The glad construct said.

Eric raised an eyebrow at the coin-sized sphere, wondering what the point of all of this was. The donkey shrugged and flipped the ball into his mouth. The strange sphere tasted like some sort of dried fruit initially, until the donkey took a swig of the water jug. When he took of sip of the water, it tasted quite similar to apple pie. In fact, the donkey could almost feel the gooey texture of apple pie filling running along his tongue. The donkey swallowed heavily, surprised to find that the globe was far larger - and looser than previously. The breathed a content sigh and said, "You know, that was decent overall, if not a bit bland in the beginning, so mission accomplished for you. What's the next test?"

"Well sir, the next 300 tests were to be more Packaberry tests. If you would like, we could move on-" Eric interrupted the machine, saying, "You know what? Give me all of them. I could go for a decent meal."

Eric did not notice, but as he was making his order, his stomach had swelled outward noticeably, making his potbelly more pronounced under his tunic. "As you wish, subject!" The robot said. Instantly, a massive plate piled high with identical spheres appeared. Eric pondered how he was going to eat all of them quickly, as he was a bit eager to leave this place. Then, an idea emerged. The hasty donkey lifted the somewhat light plate up and poured each and every ball straight down into his gullet, not even tasting them before they entered his stomach. The donkey's throat felt somewhat parched, so he lifted the jug and slowly drank the whole thing. As the donkey drank, he could fell a growing tightness around his shirt, but he reasoned that it was nothing but his imagination.

Despite having already entered his stomach, the water trigged a vast array of flavors upon hitting Eric's tongue, eliciting a moan of pleasure from the gluttonous donkey. Once finished with the jug, the donkey laid back in the throne and released a sigh of bliss. Gesturing to his metallic observer, the donkey said, "Well, I would say that was an extremely successful taste test-" The donkey paused as he heard significant growling coming from his stomach. The donkey looked own at his loud midsection, confused as to what was causing it to growl. "Sir, that was not a taste test." His automated companion said, chipper grin still in place.

The donkey's eyes widened in surprise as his belly suddenly began bloating outwards at an alarming rate, causing his shirt to ride up, exposing his white belly fur."It was a test of the number of calories that can be stored in Packaberries." The robotic rabbit said with his ever-present tone of glee.

"Wait, what!?" The donkey yelled as his belly ballooned to the size of a watermelon, snapping his belt in half. His growing midsection surged forward as the confines of the belt were stripped away. The donkey stood up from the massive throne, wavering for a moment as his feet adjusted to the increasing weight. The swelling began to increase in rate, and within a few seconds, the donkey's massive middle was the size of an overinflated yoga ball. "W-What the ever-loving hell is happening to me?!?" Eric demanded, fear running through his voice.

"The food you consumed is being converted to its true mass inside of your stomach. Overall, you consumed about 903 pounds worth of food." The artificial rabbit said as the button from the bloated donkey's pants hit his forehead, leaving the automaton unphased.

"WHAT?!?" The donkey shouted as he fought to maintain balance, the weight of his ever-swelling stomach burdening his movements. The tightness of his shirt vanished soon after, as the shirt split apart, causing another wave of stomach to burst forward. The two halves of the ruined tunic hung loosely on the donkey's flailing arms. Suddenly, the donkey lost balance, his gargantuan gut crashing into the floor, causing his pants to split apart completely, leaving the shreds of trousers dangling on the thin thighs of the massively overfed creature. The donkey was completely beached on top of his now-boulder sized gut, which was beginning to push against the throne he had just left. Finally, as the donkey rose to ten feet in height based on the belly alone, the expansion ended.

The massively bloated donkey groaned as he laid sprawled out atop his overstretched belly. Eric felt, and looked, like an overfilled water balloon, however his belly had the physics of a boulder, remaining mostly still aside from a stray movement here or there. The donkey was far too stuffed to even conjure the strength to attempt movement, especially considering his new status as a beached whale. "Congratulations! The first round of tests was a complete success, subject! Thank you for your participation! Now, we recommend that you rest and give yourself some time to digest. Tomorrow, we will begin the second round of experiments. See you then!"

The gleeful robot turned towards a wall, which slid open to reveal an opening. As the robot walked towards the doorway, the lights slowly began to dim, until the only light came from the other side of the doorway. "*Urp*... Ughhhh... W-what d-d-do yo-you mean, s-second round?" The donkey whined as the doorway closed, leaving the donkey in utter darkness.