Author's Notes:

This prompt was suggested by one of my newer Patrons, who prefers to go by the name STOPOPPRESSINGME. This chapter involves some very unusual transformation, and borderline bestiality between Rainbow Dash and her pet tortoise. Reader Discretion is Advised.

“Oh, come on, Twilight!” jeered Discord while he leaned in closer to the Princess on the couch. It’s only been ten minutes or so since they watched that unsettling scene of Luna and her gaming issue, but Twilight still didn’t seem too keen on watching another one so soon. Even after Discord wrote out an apology letter to send to Celestia regarding his involvement in Luna’s slobbishness, Twilight was too peeved at him to even speak for a while. But even as the Alicorn sat with a bitter pout and her forelegs crossed over her chest, Discord kept a determined stare on her as he asked, “Don’t you think we could watch one more scene together? Please?~”

Twilight huffed as she put her hooves back down, and looked back at him with an unamused glare. Discord was quick to throw up his paw and claw in innocence, and said, “Oh, don’t give me that look! I wrote a letter to Celestia to atone for my actions, didn’t I? I even said ‘Please’ to you! I think that should count for something!”

That may have been a fairly weak point to bring up, but Twilight was able to roll her eyes with the faintest sympathies. Despite how upset she may have been at the draconequus, she couldn’t necessarily say that it was the worst thing Discord ever did. Heck, considering some of the things she witnessed alongside Sunburst and Starlight, she couldn’t even say that scene was one of the worst either. It may have been upsetting to see Princess Luna acting so un-Royal, but she’d rather witness that in comparison to that alternate universe of herself in a diaper.

After another moment of silence, Discord huffed with a stronger look of guilt on his face. “Oh, don’t make me grovel for your forgiveness, Twilight! I already told you I was sorry!”

Fortunately for the chaotic being, Twilight was merciful enough to sigh while looking back at him. “Well… Alright, fine. Since you gave a proper apology to Celestia, I’ll forgive you for doing that to Luna.”

“Thank you,” he said with a grateful smile, before he shook Twilight’s hoof with his avian claw. After the two nodded on friendlier terms, Discord motioned over towards the ever-floating orb of magic to ask, “So… would it be alright to watch a scene now? I promise I’ll let you leave if whatever we witness is too unsettling for you.”

Since she wasn’t aware of Discord’s demented shennanigans with Starlight and Sunburst, one of her brows raised in suspicion upon hearing that promise. However, since he also said it with a tone of sincerity that was genuine, Twilight nodded with a more content smile and said, “Well, I’ll be sure to remember that if it becomes relevant, Discord.”

She then glanced back at the floating orb of magic, and tried not to wince while adding, “And given this spell’s reputation, I wouldn’t be surprised if it becomes necessary very soon.”

Discord chuckled upon hearing that detail, and gave a small shrug of his head in agreement. “Yes, I suppose I get what you mean there,” he said with a glance back at Twilight, before the side of his fanged muzzle curled up curiously. “Although… would you be against us watching an Alternate Universe scene this time around? It’s not like we couldn’t show a recording of it to Starlight and Sunburst if it’s significant enough for further research.”

After only a couple seconds of thought, Twilight gave a more casual shrug before deciding, “Well… You know what? I wouldn’t be against that right now.”

“Excellent!~” Without warning, Discord gave a profound snap of his paw to activate the floating orb, not needing any of Twilight’s magic to do so. And as the swirling colors began to activate within that dome of blue magic, he gave a quick couple of claps with his appendages to cause them to move about more randomly. Twilight stared at the draconequus as he did his work, taking note of his abilities with a curious eye expected of a scientific mind. Part of her wanted to ask how Discord was able to do such a thing, but she was sure that any explanation he gave would either be incomprehensible, or just a bunch of falsities to throw her off. It was one of those qualities about Discord which always kept her wary of him, but not enough to keep her from seeing him as a friend.

As the screen within that orb began to come into view, Discord brought back up his empty bowl, and gave a distinct jiggle of his avian claws to make a new batch of popcorn pop up from the bottom. He handed the steaming hot batch over to the Princess, and leaned himself back on the couch while he and Twilight kept their eyes on the screen. Twilight picked up a couple pieces to sniff cautiously, and took a bite to ensure it was safe. But before she could realize the popcorn was in fact really good, she immediately coughed and almost choked the moment she saw something unexpected on the screen…

“Nnnnghh!!~ Mmmmfffff… Aaaaahhhh!!~”

Rainbow Dash’s face carried an obscenely heavy shade of red, and her rapid pants synced up with the squirming thrusts her body made against her bed. Even though the surveillance spell wasn’t supposed to peer in on ponies within their private residences, Twilight and Discord seemed to have a prime view of Dash’s bedroom while she was furiously masturbating without mercy. Her hoof was vigorously rubbing between her legs, with the fur thoroughly matted from her arousal while she played with her winking cunny like there was no tomorrow. Even when her pet tortoise Tank tried to inch in closer beside her, the mare barely paid any need to him while her eyes were clenched shut. “Mnnnghhh… S-Stupid heat!” she muttered under her breath, her expression showing more annoyance than actual pleasure from her vigorous clopping session.

“Okay, SERIOUSLY?!” shouted Twilight as she glared back at Discord vehemently. The draconequus reeled back for a second in surprise, which didn’t seem to faze the Alicorn as she pointed at the screen and said, “Discord, did you alter the surveillance spell?!”

Discord’s jaw dropped in great offense, and he was quick to retort with, “Absolutely not! What would make you think such a thing?!”

“That spell was to surveil on ponies in public spaces!” clarified Twilight, whose expression tried to remain stern despite hearing Rainbow Dash’s grunting moans in the background. “So why are we looking inside Rainbow Dash’s bedroom?!”

“Oh, come on!” griped Discord with a strong roll of his eyes. “She lives in a literal cloud! You could poke your head in through a wall! Can you really consider that to be private?”

The Princess turned away from him with an annoyed groan stemming through her gritted teeth. Meanwhile, the scene of Rainbow Dash trying to quell her heat continued on for only a few seconds more. Just as Twilight was about to get up and leave the Surveillance Room, the sound of a distinct poof of magic caught both her and Discord’s attention. When they looked back at the screen, that universe’s version of Discord suddenly appeared within Dash’s bedroom. While Twilight reeled back from the screen with a surprised jolt, Rainbow Dash screamed and nearly fell off her bed.

“Oh I’m sorry, did I interrupt you?~” cooed the alternate draconequus with a sly and suspiciously wide-looking grin. While the pegasus quickly tried to cover herself up with a blanket, the Discord in that scene made a quick glance over at the magical feed, seemingly able to take notice of Twilight Sparkle and her universe’s draconequus. “Ooh, you guys managed to find that spell already?~” he asked with a piqued smirk. He then put his paw up before saying insistently, “Don’t worry, I won’t intervene if this scientific research. I’ll just pretend you guys aren’t here.” The alternate Discord shot a small wink to the magic feed, and turned back to Rainbow just as she got herself somewhat presentable.

“See?” said Discord as he shot a peeved stare back at Twilight. “I told you I didn’t have anything to do with that! It’s just a coincidence, that’s all.”

Twilight sighed with a dissatisfied look on her face, but was quick to give a brief “Sorry” to the draconequus before resuming their research.

“W-What the buck are you doing here?!” yelled Rainbow Dash as she glared furiously up at her universe’s version of Discord, seemingly not having heard what he just said to the magic feed. Fortunately, Discord kept his utmost focus on her while keeping his paw and claw raised in innocence.

“I assure you, I’m not here to do any harm or discomfort,” he said with a faux-sincere tone of voice. “I simply overheard your frustrated signs of heat as I was flying by, and I decided to come by and help out~”

“GET THE BUCK OUT!!!” she screamed with a hoof pointed at her window, which happened to be where Twilight and her Discord were looking at them from. Just before the other Discord could give a response, it seemed that Tank took advantage of that moment to try and crawl on top of her thigh. The pegasus groaned in annoyance as she pushed the tortoise off of her, and shouted, “Okay, what is with you!? I do not need you on me like that!”

“If I may intervene,” noted Discord as he looked between Rainbow and her tenacious pet. He instantly donned himself in a white lab coat, and used a pointing stick to note some diagrams on a chalkboard that came out of nowhere inside of her bedroom. “It seems that due to your hormonal balances, as well as the estrogen emitting from your nethers due to your heat cycle, that your pet Tank has taken notice and wants to--”

“WHAT DID I JUST TELL YOU!?” yelled the mare back at him, clearly not giving a shit about his explanation. “GET!!! OUT!!!”

“Honestly, I can’t say I blame her,” noted Twilight’s version of Discord while he helped himself to some of the popcorn on her lap. “He’s being very rude.”

The other Discord gave a split-second middle-talon towards the magic feed in response to that. However, he kept his eyes on Rainbow Dash before growing a devilish grin, and said with an ominous-sounding purr, “Well, wouldn’t you at least appreciate some proper satisfaction to help quell your urges, Rainbow? Since I’m trying to be more helpful to your kind, it wouldn’t feel right for me to leave you unattended~”

“What the buck do you mean by THAT?!” roared Rainbow as she threw off her blanket, and stood stop her bed with a furious glare on him. Unfortunately, her heat was still coming in at full force as her tail was flagged up high, giving Twilight an awkward view of her friend’s glistening marehood while it continuously winked. Her hind-legs also couldn’t stop fidgeting while she stood upright, almost as if they were trying to get her to give in to her biological urges. And Tank, who was still as determined as ever, tried to crawl up one of her hooves while eyeing her backside animalistically.

“Well…” Discord narrowed his eyes on the pegasus, and grew an especially mischievous grin before raising his paw up high. “Since you were foolish enough to ask for clarification~”

SNAP!!~

“NNNNGHH!!” As soon as Discord made that snap of his paw, Rainbow Dash instantly felt something sharp and intense inside of her. Her body tensed up as she clenched her eyes shut with a heavy groan, and her back instinctively arched upward like a housecat’s. Her head lurched down before she yelled out hoarsely, unable to do anything else from the effects of Discord’s magic. Her hooves clenched the bedding beneath her tightly, and another sharp yelp escaped her muzzle before that chaotic magic really started to take effect.

Twilight Sparkle covered her gaping muzzle with both hooves while she witnessed the moment in utter shock. Discord looked rather unnerved by the alternate’s actions as well, but was still curious enough to keep watching while enjoying some more popcorn.

“GNNGHHH!!!” Rainbow’s face clenched up tightly as she groaned from the sheer magnitude of foreign sensations that struck her nerves, and caused her body to freeze up in response to that chaotic magic. Slowly, her open muzzle started to shrink inward, with her upper lip growing a more pointed front like a beak. Her lip eventually curved downward, and her muzzle depleted back to give her skull a more curved appearance. Of course, what really caught Twilight and Discord’s attention was the fact that during that disturbing change, the mare’s fur and mane were beginning to retract into her skin.

Rainbow Dash kept groaning out loudly, but it was unclear whether that was due to pain or some other sensation caused by her transformation. As soon as her cyan fur started to disappear and sink into her bare skin, the mare’s pink flesh developed a greenish blue color that manifested with reptilian scales. Her arched back slowly grew thicker, and hardened to keep her in that pose underneath a familiar-looking dome. Tank paused his tenacious actions as he stared up at his owner in awe, marveling at the notable shell that Discord was growing across the pegasus’ back.

Rainbow Dash’s wings began to retract into her back, and eventually disappeared as the shell expanded out over the sides of her torso. As for her technicolor mane and tail, they soon sunk into her body like her fur had to allow those greenish scales to further claim her form. The mare’s bald head began to look even less equine as the scaled appearance enveloped all of her features, making her look more like a tortoise with each passing second.

Her muscular legs shrank to disappear beneath her hardening shell, which happened to have the faintest hues of her rainbow-esque colors across her squared sections of keratin. Her hooves expanded and morphed into thick-looking tortoise feet, which still gripped her bedding tightly throughout the transformation. And as her bare tail turned into a short, scaled stub that flicked about from the strain she was going under, Rainbow Dash became too lost in her changes to realize her entire form was shrinking down at a tremendous rate.

“Ohhhh my!~” purred Discord while he stood over Rainbow’s bed, and grinned evilly from seeing his transformative magic working so well. “I must say, you’re reacting pretty quickly for a tortoise, Rainbow Dash~”

“HUH?!” Just as the last remnants of her changing features settled into their current state, Rainbow’s bald and curved head reeled up to see the massive draconequus cackling over her. Unfortunately, before the former mare could try to attack, she screamed out in a panic the instant she looked back at herself. Her eyes widened in unrelenting fear, and she looked completely helpless while bound in such an unexpectedly compromised species. But before she could start to scream, Rainbow soon took notice of the other tortoise who was still on the bed.

Tank, who looked absolutely mesmerized by his owner’s identical form, began to loom in from behind while a grin formed across his wrinkly beak. His eyes narrowed on her with primal intensity, clearly showing the same levels of arousal that Rainbow had just a couple minutes ago. Dash wanted to run away, but her stubby legs were practically useless while they dragged at a snail’s pace across her silk beddings. Rainbow may have been one of the fastest pegasi in the Wonderbolts, but she apparently wasn’t fast enough to avoid being mounted by her pet.

“AAAHHH!!!” Rainbow yelped in a panic the moment she felt the tortoise’s weight on her back, but she grew even more worried when she saw what was curled up underneath Tank’s shell. Just between the reptile’s short legs, Tank’s anatomically correct member began to unfurl from its fleshy, curled-up state. Dash almost assumed it was an unshelled snail at first, but her beak gaped open in shock when she saw it expand out into a thin, elongated shaft. At the head of Tank’s erect cock, a disturbingly thick and inward-curved bulb was fully exposed like an upside-down mushroom, and was pointed right at his owner’s backside.

On the other end of the magic feed, both Twilight and Discord looked deeply disturbed at seeing Tank’s penis up-close. While the Princess grew worried about her friend’s safety, Discord glanced back at the alternate draconequus who was still watching from above intently. But true to his word, the other Discord didn’t even glance back at the magic feed, and kept his attention on the two tortoises about to mate. “Don’t worry, Rainbow Dash. You’re still under heat,” assured the chaotic fiend, as if that was a justifiable reason to put her through this kind of experience. “As soon as Tank helps you out, you’ll be turned back to a pony. Deal?~”

“W-WAIT!” blurted Rainbow, who was still able to talk despite her reptilian form. “I-I didn’t want to--MNNNGHHH!!~” Her shelled body froze up the moment she felt the thick, fleshy head of Tank’s member prodding between her short legs. It was unclear whether or not he was able to aim his appendage inside of the opening at the back of her shell, but his body still lurched forward like he was attempting to thrust. A hoarse-sounding blurt of a gasp escaped Tank’s beak, indicating that he was already growing too enticed to try and stop. And unfortunately, Rainbow Dash’s heat was still in full swing, and her eyes clenched shut as she struggled not to respond to that unexpectedly titillating movement. “Nnnnghhh… W… What the--”

“HUUUHHHH...” Another groaning gasp came out of Tank’s mouth, as his body lurched over Rainbow’s shell a second time. His movements were obviously slow and tedious, but his dedication was clear as day while he tried to thrust more effectively into his owner’s scaled form. Rainbow Dash’s knowledge of tortoise anatomy was limited at best, so she wasn’t able to describe the nerve-tingling sensations that were coursing throughout her new body. But at the same time, her stubby legs were curling in too tightly from the titillation to give her a moment to resist his thrusts.

“Nnnnghhhh!~” Rainbow’s eyes clenched tightly shut while she shuddered from another hard, and teasingly slow thrust that Tank gave. As the bottom of his shell grinded against the top of her’s, yet another strained gasp came out of his beak as he continued with his diligent mating. The last thing that she wanted to do was moan out, since she didn’t want Tank to think that his actions were appropriate in any way. However, since her quivering heat was still causing her mind to be clouded in unrelenting lust, Rainbow couldn’t bear to let the tortoise stop just yet.

For about ten minutes straight, Tank remained on top of Rainbow’s shell as he kept thrusting against her at a snail’s pace. Discord watched with an entertained snicker as he admired the reptilian mating session he crafted up, seemingly loving the ironic outcome he was able to provide for the speed-obsessed Wonderbolt. Instead of being given a fast and rapidly powerful rut that would’ve left her speechless, Rainbow Dash had to endure the tauntingly slow movements of her pet while trapped in her tortoise-like form. Even though it was clear this wasn’t the way she wanted her heat to be sated, she couldn’t necessarily complain while her beak hung open each time Tank rammed into her. “HUUUUUHHHHH...”

Twilight Sparkle couldn’t even look at the spectacle on screen, and had her head perched down while slumped over her waist. Even Discord was starting to look guilty for the scene they randomly stumbled across, and tried not to wince while glancing down at his morose friend. “Ummm… You can leave if you want, Twilight,” he said assuredly down at her, his voice carrying a notable hint of remorse that was rare to hear. “I’ll let you know if she’s alright, okay?”

Twilight nodded in silence, and took his offer as she made a beeline out of the Surveillance Room. Meanwhile, Tank’s hoarse gasps came out even louder as he threw his head back, and continued to push himself against Rainbow’s shelled body. Dash wasn’t able to properly moan out while her bald head was pressed against the mattress, but her blushing face seemed to indicate that Tank wasn’t exactly hurting her either. In fact, the transformed tortoise seemed fairly complacent in her compromised state by the time Tank made one final push into her, just as his reptilian member made proper contact with her cloaca.

“HHHUUUUUUHHHHHHHH…” Tank’s head lurched downward with that last strained “moan” he was able to give, with his body remaining tightly clasped against her for a good ten seconds or so. After that, the tortoise fell off of her shell with a rather graceless flop, and he landed on his back on top of the bed. His spent member slowly started to retract as it curled up like a snail again, and hung flaccidly between his wriggling legs. Meanwhile, Rainbow Dash breathed out with a long, and hoarse-sounding sigh of her own while she gripped the sheets tightly in contentment.

The Discord standing before her chuckled with a satisfied smirk, not seeming to notice the appalled stare that the other Discord was giving him through the screen. Instead, the draconequus raised his avian claw before he said, “You know what? Since I’m feeling rather merciful today, I’ll give you one last gift before changing you back~”

SNAP!!

Rainbow Dash’s head instantly reeled up as a wide-eyed look of strain shot across her face. She bellowed out a hefty grunt, and her rear legs braced hard against the bed so she could raise her backside. Her eyes clenched shut as she continued to groan out, and her cheeks grew a heavier blush from the strain she felt inside of her. Just as the tortoise’s beak hung wide-open, Discord grinned evilly upon seeing how quickly his magic jump-started her biological functions.

With a hard push, Rainbow Dash was somehow able to push out a thick, fully-grown tortoise egg that slipped out from her cloaca. The white egg was coated in a thick sheen of her reptilian secretions, which left a gooey puddle just behind her shell atop the sheets. But even as that first egg popped out to rest by itself, Rainbow kept groaning out with a clear look of strain in her expression. Meanwhile, Discord decided to lean down so he could say with a teasing jeer, “I know the mating session was a bit slow for your tastes, but you have to appreciate how quickly I got you to give birth so soon afterward~”

“NNGHHH!!~” The tortoise’s head reeled back as she groaned out even louder than before, just as another reptilian egg slipped out from the slit between the two halves of her shell. The egg took a few seconds to fully slide out from her dripping cloaca, but it wasn’t long before it popped from her orifice to rest alongside its equally fertilized brethren. As Dash continued to grunt and push with all of her might, that slimy puddle behind her body only grew larger with each egg that came out after those two.

Eventually, a sizeable pile of small, rounded tortoise eggs rested in a thick coating of Rainbow Dash’s greenish secretions. Meanwhile, the tortoise herself finally felt like her cloaca had emptied out. Her scaled head slumped down against the mattress, and she was quick to pass out following such an unexpectedly sudden birthing session. As for Tank, who was still resting on his shelled back following his animalistic romp, barely even noticed his lineage resting beside him while grinning in post-coital bliss.

Meanwhile, Discord brought out a small reptile cage before he donned a pair of rubber gloves, and carefully moved the tortoises’ eggs into the enclosure for safer brooding. After he turned on the fluorescent lamp resting on top of the mesh lid, he placed the cage beside Rainbow Dash’s bed so they wouldn’t be disturbed. “There you go, little ones~” he cooed sweetly with a warm smile on his fanged muzzle. Just as he was about to turn his attention back to Rainbow Dash, the screen began to dissipate from the other Discord’s perspective. Just before the scene ended, the alternate Discord made sure to say optimistically, “Don’t worry, other me! I promise I’m turning her back to a pegasus right no--”

And with that, the scene had concluded, leaving Discord to sit by himself with an unenthused look on his face. Even though he was greatly upset by what his form from an alternate universe had done to one of his friends, he had to hope that the draconequus wasn’t lying about that promise. Unfortunately, given how distraught Twilight Sparkle seemed before she exited the room, the chaotic being knew that there were more pressing matters to attend to in his own world.

So with a strong sigh, the draconequus reached into his ear with a claw, and pulled out a fresh parchment and quill so he could get to work. “I gotta say,” he admitted to himself with a shake of his head, “I did not expect to write out two apology letters in the span of a single day.”