Author's Notes:

Warning: This prompt was suggested by QueenieChryssie, and is a VERY detailed chapter that involves slob-play. This chapter was intentionally meant to be disgusting, and features a lot of gross imagery that might offend some readers. So if themes like popping zits, fat slobishness, or heavy diaper usage aren't preferable to your tastes, then consider yourself warned. Reader Discretion is VERY Advised

Despite how massive Twilight’s castle may have been, and how ripe with activity it usually was during the daytime (especially with rapant tourism around Ponyville and the School of Friendship), the crystal palace was surprisingly dead during nighttime. And since the castle as a whole was already fairly dreary with its dark purple architecture and intimidating dimensions, the place almost looked like a villain’s fortress when the sun wasn’t shining on it. Fortunately, ever since Queen Chrysalis’ second invasion attempt that was thwarted by Starlight Glimmer, Twilight’s castle had the best security systems implemented by Shining Armor himself. But still, even with how impenetrable the castle may have been from the outside, the sound of tip-toeing hooves could be heard echoing throughout the walls inside of the palace.

While everyone else in the castle was fast asleep in the middle of the night, Sunburst was stealthily making his way back to the Surveillance Room. The stallion may have not been the most experienced when it came to sneaking around, but he didn’t seem to trigger any alarms by the time he snuck past the Map Room. A heavy blush was accentuated across his cheeks due to his paranoia, and his glasses were nearly fogged-up from the heat radiating from his face. But regardless of how scared he may have looked, any trepidation he may have had immediately vanished the instant he got back into the Surveillance Room, and sighed in sweet relief. “Aaaahhh… Oh, sweet Celestia~”

Since the room was still illuminated with the ever-present glow of that hovering orb, Sunburst felt a bit more comfortable as he locked the door behind him. The bluish hue that was emanating from the orb and keeping the room lit, helped to show the optimistic smile on Sunburst’s face when he turned back towards it. However, just as he was able to try and light up his horn, his attention was turned towards a single sheet of paper that was left on the coffee table. The stallion looked around in confusion before he reached down with a hoof, and picked up the paper to read what it said; as soon as he saw the first line, he gasped in worry while his brows shot right up.

Sunburst,
In the off-chance that you decided to come back into this room to find that Starswirl recording, I just want you to know that Twilight already confiscated it. It’s in a locked container with all of the other recordings, and I know for a fact that you probably won’t be able to see it without her permission. I just wanted you to know that in advance, so please don’t do anything stupid.
-Starlight

P.S. - Please know that I’m really not mad at you about the diary thing. If I was, I wouldn’t have written you this warning.

Starlight Glimmer drew a tiny doodle of a winky-face next to that additional statement at the bottom of the paper, which was enough to make Sunburst sigh with a faint smile on his face. Even though he was rightfully embarrassed to have been caught in such a rouse by his friend, he couldn’t blame her for calling him out for his attempt to watch the Starswirl tape privately. Not to mention, the Crystaller was grateful that Starlight gave him that heads-up, since he probably would have done something foolish if he wasn’t given that warning. He knew that he had promised both of his friends that he wasn’t going to reattempt anything inappropriate in the Surveillance Room (and in his defense, he was planning to watch the recording somewhere else to maintain that sincerity); however, considering how the three came into possession of what was undoubtedly the rarest sex-scene ever recorded, he would’ve felt like an idiot if he didn’t attempt to watch it properly.

But alas, since he now knew that his plans were thwarted, Sunburst huffed with a skewed muzzle before sitting down on the couch. He folded up his note to place inside of his cape, which had several hidden pockets along the sides to make his garment functional. Sunburst then sighed as he looked around the empty room, and decided with a shrug, “Well… maybe it wouldn’t hurt to watch one scene by myself…”

Even though he knew better than to try the magic orb without any assistance, Sunburst was too awake to consider going back to bed at that moment. Not to mention, there was always a chance that he could find something useful to their research, which could possibly cancel out any previous mistakes he may have made. Of course, considering how he was planning to watch one sex scene, it was easy to assume what his real intentions were as he lit up his horn, and gave that magic orb a quick zap to activate it.

Sunburst sat back on the couch as he watched the swirling colors in the orb move around rapidly, and almost suddenly conjured up a new screen. The stallion grew an intrigued smirk, not expecting to get something in less than two seconds. “Oooohhh…” Since no red flags were going off in his head, Sunburst began to relax with one foreleg laid across the back of the couch, and his other foreleg resting across his lap. “Well then… hopefully this’ll be something good~”

Unfortunately for Sunburst, his curious smile dropped in an instant when the scene was finally revealed. Instead of seeing anything he would’ve preferred to watch in private, the unicorn could only reel back with his eyes widened in absolute shock, and his mouth hanging open to let out a terrified scream. But since the Surveillance Room was thoroughly soundproofed, even Owlilicious wasn’t able to help the poor stallion as he became trapped in his own hubris.

Even though it was the middle of the night, the sun seemed to be shining clear as day from the live feed from Fluttershy’s cottage. The feed gave Sunburst a prime spot in the middle of pegasus’ backyard, and was looking directly at the now vacant pig-pen. Discord was standing beside the pen’s gate with a wide and cocky grin, and wearing a farmer’s cap with matching overalls to fit with the motif he created for this event. Meanwhile inside of the pig-pen, proof of the Draconequus’ chaotic magic could be seen much more notably than the oddly-present sunlight up above; for inside of that constrained patch of mud, a near-unrecognizable blob of yellow was just barely contained inside of the pen’s boarded-off quarters. It’s head was burrowed inside of the massive metal trough that was braced across the inside fence, and filled to the brim with various deep-fried and unhealthy foods; but despite how distracting the ravenous sounds of the “pony’s” wet and sloppy gnawings were, Sunburst could still catch the distinct pinkish mane that was hanging from the side, heavily matted in mud and grease.

Fluttershy -- or at least, the giant bulking mass of fat that Fluttershy had become -- was acting like a complete and utter pig as she tried to devour every mound of greasy fried batter her muzzle could reach. The fur across her fattened face was matted in a mixture of oil, slobbering drool, and strings of mucus that were shooting from her nostrils with every wheezing breath. The mare looked absolutely disgusting as she continuously slobbered and engulfed as much food as she could, almost as if her overstuffed and underwashed form wasn’t big enough from her animalistic behavior. Even as heavy ropes of snot and spittle sprayed across the pile of deathly unhealthy food spread across the trough, Fluttershy still chowed down as much as she could like her life depended on it.

All the while, Discord was smiling evilly as he looked down at his friend with a piercing gaze. “Mmmm… that’s right, you little piggy~ Eat up as much as you can…”

Even as the Draconequus cackled in delight to the ungodly scene he created, Fluttershy seemed absolutely blissful while stuffing her greasy muzzle with more of that disgusting array. With each mouthful that she eagerly swallowed down her fatty gullet, it only added to the massively amorphous shape that her body had grown into now. All four of her hooves were completely immobilized while hanging from the sides of her swollen and overstuffed torso, which was coated in dried mud and other unknown stains. Sweat was bleeding out from all of her pores in thick rivulets, making it look like she was just thrown into a pool from how drenched her yellow fur appeared. Due to her deeply unhealthy complexion, there was a countless amount of thick pustules, red sores, and throbbing boils could be seen forming all across Fluttershy’s back; the inflammations were peeking from her yellow fur like signs of warning, and bulging badly enough to show they were just about to start popping. If Sunburst was actually there to witness the revolting sight up-close, he was sure he would’ve gagged from how rancid the smell of her B.O. must’ve been.

Unfortunately, considering the fact that a giant sheet of thick white padding was somehow covering up the entirety of the mare’s backside, the stunned-looking Sunburst had a feeling she was going to smell a lot worse very soon.

“Ughhh…” While Fluttershy continued to gorge herself like a complete pig, Sunburst was growing more uncomfortable with each passing second he spent watching her. It was almost like watching a train careening off the tracks, with the carnage of the crash being too horrifying to look away from. Even though he knew better than to stare at such a vile and egregious act, Sunburst’s eyes remained half-lidded in focus as he shook his head, and muttered to himself in shock, “... pleeeeaaaaassssse tell me that isn’t a friggin’ diaper she’s wearing.”

“As a matter of fact, Sunburst,” chirped Discord with a shit-eating grin, before looking directly at the unicorn through the magic feed. “That’s exactly what my dear friend Fluttershy is wearing for this session!~”

“GAAAHHHH!!” Sunburst nearly lept off the couch as he yelped in horror to that unexpected response. Despite knowing that Discord was near omnipotent as the living embodiment of chaos, Sunburst would’ve never expected the Draconequus to break the fourth wall for one of these recordings. And even as he saw Fluttershy’s blob-like form grow even larger in the background, it was that knowingly wide grin on Discord’s face that was leaving the stallion a deathly shade of pale while he was alone in the Surveillance Room.

“Oh, were you really surprised that I know of you and Twilight’s little ‘experiment’?~” asked Discord as he tilted his head and continued to stare at Sunburst. “I mean, you should give me a little more credit than that! I was willing to pretend I didn’t notice the first time you guys recorded me and Fluttershy during one of our ‘private days,’ but I felt the need to make my presence known this time around~”

Sunburst’s pupils shrunk to the size of pins, and his muzzle trembled in pure fear. Even though he knew that he and Twilight’s surveillance experiment was a fairly questionable idea ethics-wise, he couldn’t have imagined any worse being to confront them about it than Discord. Not to mention, the fact that he was dealing with the Draconequus by himself left him feeling even more mortified, since he knew that help wasn’t likely to arrive anytime soon. Instead, the poor unicorn was left by himself with a sadistic Discord, and a very slobbish Fluttershy who didn’t seem to be paying attention to either of them.

“Oh, but I must say,” purred Discord as the smile on his fanged muzzle widened to scarily immense lengths, “it’s rather convenient that you decided to come by while I assisted with one of Fluttershy’s fantasies~ You see, since she’s always so worried about germs and being dirty, she requested that I give her a safe and temporary means to help break her of her habits! So for the time being, I intend to make her as dirty as she could possibly want…”

Without even realizing it, the couch Sunburst was seated on instantly changed its material. With a flick of Discord’s magic, the old polyester material that covered the couch changed to a very sticky adhesive substance, which clung to Sunburst’s fur without any give. By the time the unicorn realized what was happening, and shouted out in pain the moment tried to move the slightest inch, Discord’s eyes narrowed on him before he said devilishly, “And since you decided to watch a private scene without your friends around to help, I think it’s only fair that you sit right there, and watch every single second of this~”

“AAAAHHHH!!” Sunburst struggled in his bindings, but all he could do was shriek in pain as his coat and mane remained glued to the couch cushions. He could feel each individual strand of his hair being tugged by his movements against the adhesive, which left him to lean back in his bindings with a petrified look on his face. All the while, Discord just cackled maniacally as he pulled away from the magic feed, and made sure the scene placed all of its emphasis on the fat diapered blob he created. And unfortunately for the restrained stallion, his ears twitched the instant he heard a distinct gurgling from underneath Fluttershy’s bloated barrel. “Oh Gods… Oh, Gods no…”

Without warning, Fluttershy managed to pull her head up from the pile of slop when the pressure became too immense. Her fatty face was coated in a disgusting combination of dried snot, dripping slobber, and smears of greasy crumbs that gave her yellow fur a matted brownish hue. Of course, Sunburst didn’t have enough time to gawk at all of those nasty details before he saw her maw open up wide, and she let out a deafening belch that sprayed out a profuse amount of filth from her slobber.

“BRRRRAAAAAAAAPPPPPPP!!!”

“Ooh, that’s a big one!” cheered Discord in an excitedly supportive tone, before he lunged on top of the nasty mare and groped both of her fatty sides. His paw and claw dug into two of Fluttershy’s thick and flabby folds, which were tremendously lumpy from her immense cellulite. A couple of her thicker boils bulged out from that added pressure, with the white tips starting to bubble out and risk popping due to their ripeness. “Oh, don’t hold back, my sweet~” purred the Draconequus while smiling down at his piggish mate. “I know you have much more than that to expel~”

Sunburst’s muzzle was clenched tightly shut as he grimaced, almost as if he was worried Discord would give the screen Smell-O-Vision if the thought crossed his mind. But even with that feature thankfully absent, he still tried to avert his gaze when he watched Fluttershy trying to lift up her diapered rear. The mare groaned with a lot of strain as those flabby, chunky mounds of flesh pulled up a foot or so from the ground. Her underside was completely caked in mud from the pig-pen below her, but her diaper carried a temporarily pristine shade of white before that pink tail lifted itself up. And with one especially hard squeeze from the Draconequus laid out above her, an even larger blast of gas caused Fluttershy’s padding to bloat out like a balloon.

PPPBBBBBBTTTTTT!!!

The heavy, rumbling roar that escaped from the mare’s oversized rear was as loud and deafening as the engine on an airship, and wasn’t even the slightest bit muffled by that grotesquely huge diaper. The entire Surveillance Room shook from the sheer volume of that deafening bout of flatus, but Sunburst wasn’t able to turn his head and check if anypony outside the room heard that. Instead, the unlucky stallion was forced to subject himself to the unflattering sight as Fluttershy’s massive fart continued to blast out. That five-second rumble soon turned to ten, and then to a shockingly long fifteen seconds of pure, uninterrupted growling that burrowed out from her cellulite-ridden rump. And as if that gargantuan expulsion wasn’t shocking enough without visual emphasis, Discord made sure to turn his friend’s gas into a string of toxic green clouds; by the time that meaty groan from her gut began to dissipate to a round of meager squeaks, a long row of fart-clouds shaped into P’s, B’s, and T’s were hovering over Fluttershy’s body like a panel to a comic strip.

“My goodness, that was a big one!~” exclaimed the Draconequus while he laid atop a couple of the clouds like pillows, and had an oversized clothespin clamped over his nose. His dementedly wide smile remained pointed at Sunburst, who had become deathly silent on his end following that shocking display. The unicorn’s left eye twitched a little behind his glasses, and his muzzle was hung down while he carried a stunned expression. Of course, it was clear Discord didn’t care about Sunburst’s shock as he remained above his disgusting friend, and asked cheekily, “What did you think of that, Sunburst? Are you feeling tempted to masturbate to ponies without their consent again?~”

“Nnnngggg!!” Sunburst tried to squirm out of the Draconequus’ restraints, but any movement he made caused him to shout out painfully from the strain he was putting on his coat. He knew why Discord decided to subject him to this kind of torture, but the Crystaller wished nothing more than to make this nightmare end. As his teeth gritted tightly with a mix of panic and guilt on his face, it didn’t take long for Sunburst to answer with a strained grimace, “N-NO!! I… I wasn’t going to do that!!”

“Oh, so is that why you decided to sneak into that hidden room in the middle of the night?~” Discord’s intrigued grin never dissipated, but his eyes narrowed evilly on Sunburst while trapping him in that lie. The chaotic being decided to pull his claw down towards Fluttershy’s bulging body, as the mare went back to devouring her trough of food without any complaint. Sunburst tensed up the instant that magic feed was pulled in closer to the pegasus’ damp and smelly form, and he was forced to see Discord’s avian-like digits squeezing hard around a thick cluster of zits near one of her fat-rolls. “Honestly, if you were wanting to see something unique,” purred Discord in a low and maliciously gleeful tone, “then perhaps this will give you what you want~”

“DISCORD, PLEASE DON’T--”

Despite how direly desperate Sunburst’s plea may have sounded, Discord waited until the focus was entirely on Fluttershy’s nasty boils before he gave them a singular burst of release. Four of those thick, drooling zits erupted in an instant, which shot out multiple arrays of dark yellow puss that dripped down her yellow fur. Sunburst nearly gagged upon seeing those ropes of secretions oozing over Discord’s claw, which was close enough to the screen for the unicorn to practically taste. Even without the sense of smell coming through the magic feed, Sunburst was sure that Fluttershy smelled like absolute death in the state she was in. And while Discord rubbed his smeared claw all across the sweat-soaked fur atop Fluttershy’s back, which left his digits shimmering in a thick greasy glaze, the stallion coughed a couple times as he struggled not to throw up for real.

“Oh, do you not like seeing things like this?~” asked Discord in a mockingly jeering tone. He used his free paw to somehow grab hold of that magic feed, and pull it around with him after he landed back on the ground. Sunburst’s pupils shrunk even smaller with dread, not needing any clarification as to where Discord was taking the scene next. The Draconequus continued to talk as he directed the screen towards Fluttershy’s padded backside, where an evident brownish hue could already be seen from that ass-blasting she gave earlier. “Well, maybe this will ensure that you and your associates take this experiment more seriously…”

Just at that moment, another gurgling rumble could be heard from beneath Fluttershy’s bulbous build, and she let out a pained whimper as her head lifted up from the trough. Her diapered rear pulled up again as well, with the stench of her gas still ripe enough to make the magic feed ripple like the horizon on a blisteringly hot day. But for Discord himself, who pulled his head in to stare directly at Sunburst, he didn’t seem to mind the revolting smell at all while glaring at the stallion with narrowed eyes. “And you better believe me, Sunburst,” said the Draconequus with a scarily serious voice to show he wasn’t fucking around, “If you or your friends try to spy on Fluttershy, or anybody else for your own perverted interests, then I will see to it that your face will be Planted. Right. Here~”

As if that intense threat wasn’t genuine enough to make Sunburst writhe in his seat with a horrified wince, his heart felt like it was going to stop the moment he heard Fluttershy start to grunt hard.

“Oh, and if I do have to cash in that threat,” added Discord before he could pull away from the shot, as he gave Sunburst an especially evil-looking grin and said, “I’ll bend your mind enough to make you want it~”

The Draconequus finally disappeared from view, and left Sunburst trapped in sheer terror the instant Fluttershy began to push. “Nnnnghhhhh… Aaaaaahhhhhhh!!~”

The pegasus lifted her greasy and crumb-encrusted muzzle up high, and let out a deep moan of relief as she let her bowels release. While it may have not been as loud as her immobilizing fart, the wet and nasty splorch that expelled from beneath her padding was still audible enough to leave Sunburst’s ears ringing. It sounded like a wagon’s worth of filth was just dumped out into a vat of mud, and the rear of that diaper instantly swole out to emphasize how close that metaphor was to being a literal comparison. Despite the fact that it looked like there was a good five feet in width for that oversized diaper, it seemed like every inch of the material was put to use as the lumpy mass inside pushed it outward to its limits.

“Theeerrrrrrrre you go~” cooed Discord with a kindly supportive tone as he hugged Fluttershy’s slobbish form tenderly, and rubbed her sides to help her keep pushing. “That’s right, Fluttershy… Let it aaaaallllllllll out~”

Fluttershy did just that, and pushed even harder as her expression grew more strained. Of course, Sunburst couldn’t exactly see the mare’s face while her diaper took up the entirety of his magic screen. Instead, the unicorn was forced to groan in dire distaste as he saw that padding continue to push closer towards his sights. The nastily wet splorches didn’t let up, and it didn’t take long for that thick wall of white to turn a grotesquely deep shade of brown. More of the mare’s built-up filth flooded the inside of her garment, and soon became heavy enough to make the waistband sink down a couple inches. The weight grew more immense with each hearty push she made, which caused the bottom of her padding to start hanging down obscenely between her chunky legs.

If there was any proof that Discord wasn’t completely evil, it was due to the fact that he didn’t subject Sunburst to the unholy smell that was protruding from his friend’s sagging diaper. But alas, even that gracious absence wasn’t enough to keep the stallion from lurching against his restraints on the couch. He let out several hurling gags, but nothing was able to expel from his muzzle just yet. Instead, his strained eyes were tearing up as he remained trapped in the Draconequus’ twisted whims, silently begging that he would be given some mercy from this relentless terror.

“Aaaaaaahhhhhhhhhhh~” Even though she was still thoroughly bloated-out, it appeared that Fluttershy was spent in satisfaction as she laid her head back inside the trough with a tired smile. Behind her still-upraised backside, her diaper was flooded with enough manure to leave it just barely hanging by the tapes on the sides. It was hanging down low enough to sink into the mud of the pig-pen, even though Fluttershy’s legs were fully extended up to hoist her massive rear up. Of course, considering how gargantuan she looked in her slobbish state, her bulging torso looked to be equally as swollen out as her diaper after its severe usage.

Eventually, the piggish mare went right back to eating as she sunk her fat face into the pile of slop, and tried to devour more garbage from the trough. Meanwhile, Sunburst just sat on the glued couch with a completely emotionless face, as if that scene was shocking enough to leave his mind completely frayed. The Crystaller merely sat with a paled, thousand-yard stare, which lingered on for a long time while the scene remained glued to the aftermath of Fluttershy’s horrid act. By the time Discord finally came back into view, he could immediately tell how traumatized and broken Sunburst appeared through the feed. For a split-second, the Draconequus carried a more sympathetic look as he pouted through the screen, and let out a disappointed huff through his nostrils.

“Well… I’m really hoping that you learned your lesson, Sunburst,” said Discord in a more withheld, and almost guilty-sounding tone. Sunburst nodded his head in an instant, even though his dissheveled expression didn’t change in the slightest upon hearing that question. After another moment, Discord sighed before giving a snap of his paw, and undoing the glue-like state of the couch. The stallion was freed from his restraints, but the unicorn was left in a bad-enough state that he remained frozen in his seat. That response worried Discord even more, as he grew a more upset look and said sympathetically, “Look, if you promise not to view any scenes by yourself anymore, I’ll consider wiping your memory of this event by tomorrow. Will that be al--”

“YES I PROMISE NOW GET ME OUT OF THIS FUCKING ROOOOOOOMMMMMM!!!”

That primal, unrelentingly rage-induced scream made the walls of the Surveillance Room rumble from the sheer volume of Sunburst’s voice. Even Discord had to reel back from his end of the magic feed with a shocked look, not expecting a pony like Sunburst to make such an exclamation. Nevertheless, the Draconequus was quick to put his arms up in innocence and say, “Alright! Alright! You can leave now! You learned your lesson, okay?”

Sunburst immediately got up from the couch, and stomped towards the door with a mercilessly bitter sneer on his face. Back at the floating orb, Discord cringed a little through the screen before asking meekly, “Uhhh… is it too late to apologi--”

His words were cut off the instant Sunburst paused, and gave the chaotic beast the most intense glare imaginable. With that, Discord shut his muzzle right up, and gave an affirming nod to show he got his answer. Sunburst’s eyes narrowed on Discord for just a moment longer, before he made his leave and slammed the Surveillance Room’s door shut.

By the time the screen of the magic orb finally went away, Discord sighed while he remained at the other end of the feed. However, the instant he looked back at his bloated friend, who was still indulging in her piggish behavior, the Draconequus grew a coy little smirk before saying to himself, “Well… at least I did something to help maintain my best friend’s dignity.”

Almost like a physical sign of comedic timing, Fluttershy’s response to that comment was another ripe, ten-second fart that was intense enough to make her padding ripple again.