Twilight studies Changelings.

Thanks to Gyvon for the request!

This chapter will contain non-human pony clop.

Categories: Research, Reproduction, Changeling, Twilight, Prisoner

Warnings: This chapter might be a bit extreme near the end, and slightly dark. To include impregnation and rape. Not for everypony.

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“Test Subject”

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“I came as soon as I had the time! Did you really capture one?!” Twilight stormed through the doors to the throne room unceremoniously, running across the red carpet towards Celestia. Thankfully, the princess was alone. No hoofservants, dignitaries, nopony was around. She must have been expecting her.

“Indeed we did. Come, I’ll show you to it.” Celestia smiled down at Twilight as she slid off of the throne, leading the slightly flustered purple unicorn through a side door. Twilight followed without question, feeling glad that Celestia hadn’t chided her on her tardiness. She had actually received the letter yesterday morning, but she was far too busy preparing the necessary supplies before leaving for Canterlot. That, and the train wasn’t running. The entire ride up the mountain, Twilight cursed the transit system, and had ran from the station to the castle. Celestia appeared to be fine with Twilight’s delay, though, so she hoisted her saddlebags higher on her back before striding forward to walk beside her teacher.

“How is it?”

“Frightened.” Celestia said quietly. “It appears being separated from other changelings has made it anxious, and slightly hostile. We have it under a very careful guard.”

“I see.” Twilight took mental notes as they continued walking, still wondering what Celestia had meant by ‘research.’ The letter had called Twilight out to Canterlot, explaining that Celestia needed her to research a test subject. She would actually be the first pony in recorded history to study a changeling specimen up close. Previously, it was all but impossible to capture an individual one.

“In here.” Celestia had led Twilight down through the palace and into the crystal caverns beneath Canterlot. Set into the stone wall was a door, rimmed with glimmering crystals and marked with an intricate arcane pattern. “This spell keeps the changeling in it’s natural form. I’ve had this chamber prepared ever since the attack. We’ve taken to leading prisoners in here before interrogating them, to discover if they are changelings or not. We discovered this one just yesterday morning.” Celestia gestured over the pattern before slipping inside. Twilight took a moment to survey the intricate pattern. It was really advanced magic…

“Okay.” She muttered before slipping in behind Celestia. Inside, four guards were posted at the corners of a roughly-hewn room, with several guttering candles providing the only light. Despite the only light coming from the weak flames, the crystals embedded into the walls took that light and reflected it dozens of times in on itself, lighting the room tenfold for each weak candle. Twilight could clearly see the prisoner changeling, each one of it’s hooves wrapped with thick leather cuffs. Each one of those cuffs were chained to the floor individually, and it’s bright green eyes flashed at the two new ponies that entered the room. Twilight gasped slightly as the prisoner bared it’s pointy white teeth, hissing at them.

“Still hostile, then?” Celestia asked a nearby guard, frowning down at the changeling.

“Afraid so, Princess… He hasn’t slept, has hardly even relaxed. I wonder if they even need to sleep…”

“Well, that’s what she’s here for.” Celestia glanced at Twilight with a ghost of a smile. “She’ll be researching the subject. I’m placing you under her command. You are to follow her orders as if they were my own.”

“Yes, Princess!” The four guards snapped to salute simultaneously. The prisoner glared at Twilight.

“Twilight, please exercise caution. I understand researching is serious business, so if you need to dismiss the guards, feel free to do so. But I would feel much more at-peace if at least one were to remain in the chamber.”

“I understand, princess. Thank you.” Twilight bowed to Celestia as she raised her head, nodding at the five ponies and fixing the changeling with a glare. Almost as if saying ‘don’t try anything funny.’ She left them alone, the four stoic guards and a slightly nervous Twilight.

“H-how long since you have been relieved…?” Twilight asked shyly.

“Sixteen hours for us two, twenty-four for them.”

“Oh. I only need two guards, I should think. You two are welcome to leave.” Twilight nodded to the two who had been in the room for a full day. They saluted crisply and turned to leave without further word. Twilight hovered her saddle bags into one of the spots vacated by the guard, withdrawing a rolled-up scroll and a quill. “What’s the status of your relief?” Twilight asked, preoccupied mostly with titling the scroll.

“None yet, Ma’am.”

“You’re welcome to call me Twilight.”

“None yet, Twilight.”

“You there,” She gestured. “Please, go inquire with your commander about relief. Be quick.”

“Yes, ma’am!” The guard saluted and left the chamber, leaving Twilight alone with one guard and the changeling prisoner. The jingle of chains alerted her to movement, and she immediately enveloped the changeling in a field of telekinesis. Turning to look at him, she saw the changeling mid-lunge, the chains tight and straining to keep the beast restrained. He was in midair, halfway between the spot he was chained to, and the lone guard.

“You should know,” Twilight sighed at the helpless changeling. “I’m a unicorn. Try something like that, and I’m not afraid to restrain you more firmly.”

“Let us go.” The changeling hissed. Twilight shuddered at the voice of this creature. It appeared to be sentient, intelligent, capable of independent thought. She scribbled hastily. “Let us free. The queen calls us.”

“Has it spoken previously?” Twilight asked the guard.

“This is the first I’ve heard one speak. Ever.” The changeling glared at the guard, closing it’s mouth.

“Keep talking.” Twilight urged, staring straight into the changeling’s green eyes. She saw it turn it’s head marginally to the guard. “Oh… You won’t talk with the guard around?” When the changeling shook it’s head, Twilight looked at the guard. “I know it’s against Celestia’s wishes, but it appears the changeling needs to be alone with me. Please, leave and inform the other guards not to enter until I say.”

“Twilight, the spell prevents sound from escaping this room. You won’t be able to inform us without leaving yourself.”

“I can handle my own,” Twilight glanced at the changeling, who was staring at the two of them intently. “As I’ve just demonstrated. Please, don’t allow anyone else into this room without my say. The exception being Princess Celestia, Princess Luna, or Princess Cadance. Understood?”

“Yes, Ma’am!” The guard saluted again and left. That was one thing Twilight admired about the guard. They followed orders without much questioning… Once the door closed, Twilight was alone with the changeling.

“Satisfactory?” She asked, turning and sitting on the cool stone floor as she surveyed the prisoner.

“Yes. Now free us.”

“You know I can’t do that.”

“Free us. Let us go.”

“Okay, you’re obviously stuck. Do you want me to just take the chains off, or completely let you go.” The changeling looked at the door, then back to Twilight.

“Let us free.” Twilight sighed. It was like arguing with a brick wall. Or Rarity.

“Fine. You’re not going to cooperate.” She lifted the parchment and quill, scribbling her observations thus far. The changeling fell quiet, though she could feel it’s eerie green eyes penetrating into her. She tried to ignore the feeling of being watched as she continued scribbling notes, muttering to herself. “Speech pattern: Subject refers to itself as a collective, possibly a result of the hive mentality. Physique: Similar to an average pony, though the presence of both wings and a jagged horn suggest alicorn descent. Wings: Diaphanous, not dissimilar to an insectoid’s, though…” She glanced up, walking around the changeling in a slow circle. Thanks to the chains, it could only follow her a little ways, it’s head craned around as far as it would go as she reached a hoof out to rustle the changeling’s wings. “It lacks particle emission. Not reminiscent of a moth or other similar winged insect.”

“Let us go.”

“The changeling’s horn is misshapen, and does not seem to serve the same purpose as a unicorn’s… For comprehensive reports on magical capabilities, refer to later articles… Legs and body: The subject’s four legs are spotted through with hollow holes…” She reached a hoof out to touch one such hole, but the changeling scampered backwards, the chains jingling loudly. She grasped the creature in magic once more. “Stop moving. Oh, shoot… I wrote that down.” She glared up at him, adding more weight to her telekinetic field. The changeling shuddered for a few moments before collapsing, laying flat on the stone floor. “Sit still. I need to correct this.” The changeling squirmed and emitting thin, chittering noises as it struggled to stand up. She ignored the noise and focused on fixing her documentation, correcting the blemish.

“Ugh… I have to start over. Damnit.” She pulled a fresh scroll out and went about copying her notes so far. This was all a rough draft anyways, but it was for science. Her notes could come under scrutiny later on. “There.” She nodded, fifteen minutes later. Her telekinetic field faded, freeing the changeling.

“Release us.”

“Shush. Now. Physique…” She ran a hoof over one of the holes in the changeling’s legs, her expression focused. “The skin of the subject’s legs is not unlike an average pony’s, but the interior of the holes are spongy and soft. Porous.”

“Let us go.” Twilight sighed and dropped the parchment, looking at the prisoner.

“Will you be quiet? I’m not going to release you. What will you do when I let you go? Hmm? You can’t go back to the other changelings. You can’t even leave this room.” The changeling stared at her for a few long moments, obviously thinking.

“We cannot be?”

“I don’t understand.”

“We… We.” The changeling tapped it’s chest with a hoof. “We cannot go to the queen?”

“Of course not!” Twilight looked at the prisoner incredulously. “That’s ridiculous!”

“… New queen.” Twilight’s eyes went wide as the changeling plopped down onto it’s haunches, lifting it’s upper body as much as it could. It’s hind legs spread, revealing an aperture near the crotch of the beast’s carapace, and even as she watched, it spread open. Green fluid leaked out onto the stone floor, preceding a shaft of pink, knobbed flesh. Twilight gasped at the sight as it emerged into the cool air of the modified cell, twitching and oozing more lime-green fluid from the tip. “New queen.” The changeling repeated, it’s eyes fixed on her.

“What?” Twilight whimpered, looking up into the changeling’s eyes.

“New. Queen.” The chains broke. Twilight screamed. Before she could summon her magic, the changeling pounced on her, driving her down to the cold, stone floor.

“Get off!” Twilight grunted, fighting to push the changeling away. Her horn finally glowed, emitting a bright beam of lavender light. The beam lanced off of the changeling, bounding away to hit a crystal, causing it to explode. “What?! Deflected?!” The changeling lowered itself onto her, it’s mouth close to her ear. She heard it whisper softly, even as the knobby, pink shaft of flesh began to rub against her stomach.

“New queen…”

“Get off!”

“New queen.”

“HELP! AUGH!” Twilight blasted the changeling again, to no effect. It couldn’t be hit with magic, and she was too weak to fight it. This was bad. This was very, very bad. The changeling rubbed itself against her, spreading sticky, green fluid over her coat. “Eewww! Stop! Please, no!”

“New queen!” The changeling’s legs moved to spread her apart. Twilight gasped as she felt her legs forced apart, wide enough to be pinned to the stone on either side of her.

“No! STOP!” It rubbed it’s sickening green cock against her, dribbling green fluid onto her, moving lower and lower. “STOOOOOOOOOOP- AUUGH!” Twilight grunted as the changeling thrust into her, spearing her unprepared marehood apart. She felt it rip through her, shooting pain and completely unwanted pleasure through her lower half. “N-noo…” She groaned, completely defeated. Her eyes closed, in denial of what was happening. She pushed at the changeling, trying to push it off of her. Her hind legs were useless, pinned as they were, and for every time she planted a fore hoof on the changeling’s chest, it batted her away effortlessly. Meanwhile, it’s own hips started to move.

And it was not gentle. She whimpered with pain as it moved deep into her, the bulbous flesh rimming her with each rough thrust. Soon enough, she was panting, the pain fading away into a dull, distant reality. “New queen.” The changeling panted, still moving fast. Twilight felt the tears build up in her eyes, spilling over as she stopped fighting it. She couldn’t do anything. She was resigned to her fate. This changeling was viciously raping her, violating her most private area.

“S-stop,” She gasped, trying to flex around it, trying to push it out somehow… But each flex only seemed to spur it on. It responded to her weak protest by thrusting faster, it’s entire body shuddering for an instant. “N-no… Please, no…”

“New queen,” The changeling grunted, and she felt it begin to pour forth… The twitching shaft of pink flesh inside of her oozed and shot thick streams of something gooey, something very thick and sticky, deep inside of her. It was slick and cold, made her shiver and feel sick to her stomach.

“Noooo…” She groaned, her head falling to the floor. The changeling pulled out, a disgusting, slick sound coming from her abused crotch. She felt it dribble out of her core, staining her tail and puddling on the ground beneath her.

“No. New queen.” The changeling pressed a hoof to her center, holding the sickening fluid inside of her. “Not enough. New queen!” Flexing it’s abdominal muscles, the changeling returned blood to it’s member, the knotted flesh swelling again.

“No! Not again! Stop!” Twilight gasped as the changeling thrust into her again, filling her aching center with a smooth motion. She gasped as the swirling sensation of viscous cum inside of her was intensified by the slick, bulbous cock that roughly violated her. She wanted it to end. She never wanted it to start in the first place. But now, subject to the rough thrusting, Twilight could do nothing but endure it. Whimpering and shuddering under a new wave of rough, fast thrusting, Twilight felt the changeling’s hard body press down against her.

“Good for the queen?”

“NO.” Twilight cried, her chest shaking. “No it isn’t! Stop!”

“Good for the queen. New queen.”

“Ugh! Stop!” Twilight doubled her efforts, but the changeling was now pressed down against her. She couldn’t do anything. She couldn’t even roll over on top of the damn thing. “STOP!”

“New queen.” It’s hips picked up pace once more, slamming into her over and over. Twilight whimpered under the rough touch, her body aching with pain and forced pleasure equally. If he kept doing it so hard, she would cum, and she really didn’t want to. She really, REALLY didn’t want to let this thing make her orgasm. She tried to focus on something else. To let her mind travel off and away from this horrific, nightmarish experience. Instead, each rough thrust pushed her back to the present, made her focus on the violation of her body, on the slick, sticky fluid that was still stuck inside of her.

“New. QUEEN.” With a breathy grunt, the changeling sealed it’s hips against Twilight’s, pouring another load of disgusting spunk into her. Twilight wept, sniffling as she felt the fluid pour into her with each repeated spurt of the disgusting member throbbing inside of her.

“Off.” She whimpered helplessly. “Get off… Please…”

“Queen…” The changeling pulled out of her, immediately replacing it’s hoof over her center. She whimpered, squirming her hips, wishing to push the disgusting fluid out. Her horn glowed again. She couldn’t cast magic against the changeling, but she could against herself. Gripping the flesh of her organs, she squeezed them together, forcing the sickening fluid out.

“NOOO!” The changeling raged, pressing it’s hoof against her more firmly. “New queen! NO!” Twilight squeezed harder, forcing the alien liquid out, panting as she felt it void her core. “NO!” The changeling glared at her horn. Quickly, it swiped it’s hoof out, ramming one of the holes in it’s foreleg down around her horn. Twilight’s eyes went wide. Her magic died. She tried to force more liquid out, but her horn just feebly sparked and flickered. She couldn’t use magic anymore! Not even on herself!

“What did you do?!” Twilight gasped. The changeling glared down at her, it’s free hoof roughly rolling her over. She grunted as he forced her onto her stomach, spreading her legs again. “Stop! What did you do to my magic?!”

“New. Queen.” The changeling grunted, pulling her tail aside. She felt the bulbous head press against her again. She flexed hard, trying to keep him out, but he roughly spread her legs apart, and pushed deep into her again. Whimpering, crying, Twilight was subject to another rough session. This time, she couldn’t do a thing to fight it. She was pinned to the cold stone floor, her magic shut off, her aching core filled with this sickening thing… As the pain faded away again, Twilight felt the undesirable pleasure pulse through her, filling her front to back. Crying out loud, Twilight had to surrender to the orgasm, shuddering as she was filled with another load of sickly green goo. The changeling thrust rough and fast through his own orgasm, still oozing as he set in again. Twilight could hear disgusting, wet sounds emanating from her pussy. It seemed the changeling was intent on filling her to the brim. Before long, he burst forth with another sickening load, and another after that. Twilight lost track of the time, her body wracked with unwanted orgasms as she was filled to the brim with changeling cum.

When it was all over, the changeling collapsed against her… Twilight thought something seemed off. Willing her sore and tired muscles, she stood up. She bore the changeling’s weight easily, and when he slid off of her back, he landed with a hollow sound. Twilight’s stomach felt distended with the sickening fluid, though it dribbled down her thigh and onto the floor. She was too tired, too distraught to cast any spells, and the frightening sight of the empty insides of the changeling made her feel sick. Slowly, feeling her swollen middle sway sickeningly with the load of goop, Twilight tried to make it for the door.

“Help,” She croaked, barely managing to pull it open. “Help me…”

“Twilight!” The four guards looked down at her. She collapsed on the threshold, still leaking green ooze as she looked helplessly up at the guards. Behind her, the shattered husk of the changeling lay amid a small pool of similar fluid.

“Please…”

“Get the princess.” The guard breathed, looking at his comrades. “Now!”

Twilight passed out.

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“Hnn… Owww…” Twilight groaned as her eyes fluttered open.

“Subject demonstrates consciousness. Four-forty-seven.”

“What… What’s happening?” Twilight groaned. She went to press a hoof to her face, but something kept her from moving her hoof at all. Panic set in as she struggled against the bond.

“Inform the princess. Subject is awake.”

“Subject… What?” Twilight blinked, trying to make sense of the scene.

“Subject is confused as it surveys it’s surroundings… Four-forty-eight.” Twilight realized where she was. This was the palace’s magical laboratory. She was inside one of it’s many test chambers, and she was chained down to a metallic table.

“What’s happening? Celestia…?” Twilight felt the panic raise in her voice. She rolled her head to either side, saw her hooves were strapped to the table. She lifted at the leather straps, grunting with the effort, feeble as it was. Looking up, Twilight saw the mirror. On the ceiling, suspended above her, was a large mirror. She could see herself at last.

Her arms were dotted with holes. Her diaphanous wings lay spread out beneath her. She was taller, more slender, and completely black. Gone was her purple mane with the pink highlight, replaced instead by teal. Her horn was jagged, with circular holes in it, and she was, for lack of a better word, a changeling.

“No… No… This can’t be. NO!” Twilight fought against her bonds more firmly. “NO! NO! NO NO NO NO! NOOOOOOOOOO!” Thrashing atop the table, Twilight felt magic grip her, keep her pinned, keep her from writhing.

“Doctors.” Celestia’s voice broke her reverie. The magic faded, and Twilight looked down the length of her new body at Celestia.

“Princess!” At least her voice was her own. “Princess, please!”

“Relax,” Celestia said gently. “I don’t know who you are, or what you did with Twilight, but I’ll not stand for it.”

“What?! I AM Twilight!” She gasped, looking up at Celestia incredulously. “I… I’m your student!”

“I’ll not have any of your lies, you filthy creature! You did something to Twilight down there, and I plan on finding out what!” Celestia’s mane flared out as she glowered down at her.

“Princess, please…”

“No more words. If I have to gag you, I will.” Twilight felt the tears build up again, running down her chitin-plated cheeks.

“But… Tia.” Celestia glared. The most personal, passionate name either of them had ever shared was spoken so quietly… Almost as quiet as a whisper. Celestia turned her back, pausing at the door. Her beautiful face turned back to look at Twilight, strapped to a table, with several doctors all around her.

“Dissect her. No anesthetic.”

Twilight screamed.