"Hail Sombra," Celestia said, as she stepped forwards, taking the armor in her magic. The latex that covered her creaked and creased with each step, sending little bursts of pleasure down her spine.

"Break her utterly, Celestia," her king ordered her. "Turn her loyal."

"Yes, my king."

Saying the words felt good, sent a warmth through her encased nethers.

She set her eyes upon the mare in front of her. Twilight Sparkle stared up at her from where Celestia's magic was forcing her to kneel, searching for any sign of her old teacher left in those green-swept eyes. There was none to be found.

"As much as I would love to stay and watch," Sombra was saying, "I have preparations I must attend to. Bring her to me once you've finished."

"Yes, my king." Another pulse through her nethers for her obedience.

"Good. And Celestia?"

"Yes, my king?"

"Make it slow."

And with that, he departed, leaving Celestia and Twilight alone in the throne room. The two mares stared at each other for a time, Twilight's panicked gaze meeting Celestia's cold one.

Celestia contemplated how best to begin the task her king had set her. She decided it would be prudent to start by his example.

Her horn sparked, and Twilight was pulled to her feet. Her clothes were torn off of her body and burned away; she would not be needing them again.

Twilight stood there, shivering, eyeing her cautiously. Her hands moved to cover her breasts and her crotch, but Celestia took hold of them and forced them to the mare's sides.

Twilight's breasts were smaller, perkier than her own. The sight of them, the sight of her, bare before her, naked and exposed, excited Celestia. Still, she kept up the emotionless visage, as she was meant to.

Her prisoner opened her mouth.

"Princess, please, this isn't you!" Twilight said. "It's Sombra's magic, he's taken control of you! You have to fight it!"

"I know exactly who I am, Twilight Sparkle," Celestia said, her voice even, giving nothing away. "I am Knight-Commander Celestia, leader of the armies of King Sombra. I exist only to execute my king's will."

No!" Twilight shook her head. "You're Princess Celestia, kind, benevolent ruler of Equestria! Alicorn of the sun! My mentor! Don't you recognize me?"

"Of course I do."

For a moment, Twilight's eyes grew hopeful.

"You are the mare my king has commanded me to break."

The hope fled as quick as it came. Celestia's magic sparked again; a force took hold of Twilight's skull, forcing her to look straight forward, her head up. Her back was straightened; her feet were brought together; her arms remained locked at her sides.

Celestia had brought her to attention.

"Please," Twilight begged, only able to move her mouth and her tearful eyes. "You need to remember! Can't you see that he's controlling you?"

"Of course," Celestia said, striding up to her, her latex-lined hips swinging. "To be controlled by my king is my purpose. I would want nothing else."

The pieces of armor floated over. These were smaller than her own, of slightly different proportions. Perfectly molded for their recipient, ready to convert her into a loyal servant to her master. The very thought of it filled Celestia with lust. Her thighs rubbed together, and she bit back a moan.

She began with the arms, just as her king had. The twin guards separated from the rest, floating close enough that Twilight could inspect their surfaces before descending towards their place. Her king had ordered her to make it slow, and she relished the chance to show her captive exactly what she was doing.

Celestia let them hang there, floating just off of Twilight's skin, just enough to brush the tips of her coat-hairs. Her captive gave her one last pleading look.

"Please," she begged. "Don't do this!"

Celestia fought the urge to lick her lips as she let the metal descend onto Twilight's skin, their cold edges making the mare gasp. Heat was beginning to build through her whole body, now. This was what obedience brought; her mind had been conditioned to feel pleasure when following her master's orders, and the tight, magical latex that covered her from her neck to her feet only amplified that sensation.

The straps of the armor circled Twilight's forearms, tightening the metal into place. Within moments, the same grey substance that encased Celestia's body began to spread across her arms.

"Nngh," Twilight grunted, as the latex consumed her. "What... what is this? Dark magic?"

"Our king's will," Celestia answered. "It will be your new skin, a symbol of your total devotion to our king."

A blush had come onto Twilight's cheeks. "W-what's it doing to me?"

"Enhancing your sensitivity. Amplifying your lust. Molding you into the perfect, obedient soldier."

Celestia watched as the magic reached its conclusion, ending around Twilight's elbows. The heat in her body continued to grow; she could feel herself getting wet under her suit. "Don't fight it," she said, absentmindedly trailing a latex-clad finger up her latex-coated thigh. "You'll love it when we're done."

"T-this is what he did to you?" Twilight exclaimed. "He's a monster!"

Celestia looked at her sternly. "He is our king. You will show him respect."

"He's not... my king!" Twilight grunted. "And he's not yours, either!"

In response, Celestia slapped her across the face.

She wasn't sure why she'd done it, but it had felt right. She couldn't let an insult to her master go unpunished, after all. And punishing the mare in front of her for it had felt...

Good.

For the first time since her indoctrination, Celestia smiled. It wasn't a kind one.

Twilight stared at her, shocked, as a welt appeared on her cheek. It took her mind a few moments to process what had happened.

Celestia wouldn't give her the chance.

The next two pieces rushed over, the grieves. Their straps pulled down tight on Twilight's legs, still held in place by Celestia's magic. She gasped as Sombra's magic began to spread across her calves.

Celestia's breaths were getting heavier. Her crotch was soaking with her juices; her breasts felt warm, and her nipples had perked up, pressing through the latex and into the metal cups of her armor. Each breath made them grind together, adding to the pleasure building up in her body.

But she had a job to do. She could lose herself to her lust later, after her task was complete.

Twilight's breaths were getting heavier, too, as the latex finished encasing her lower legs.

Then again, her king had told her to make it slow...

Celestia stepped to Twilight's side, began to circle her, simply observing her. While not as voluptuous as her own, the mare's body was still... delectable.

"How are you feeling, Twilight Sparkle?" she asked.

"Guh... you're going to have to do better than that," Twilight replied. "I won't break... for the sake of my friends, my family, you... I won't—"

Celestia's hand came down sharply on her thigh, right over the cutie mark.

"Agh!" Twilight yelped, her muscles straining, but Celestia held her locked in place.

"Our king demands your obedience," Celestia told her.

"I'll... never..."

Down came Celestia's hand again, in the same spot.

"Ack... ngh..."

"Our king's command is absolute. His will is our will."

"N-no—"

Again. Twilight didn't shout this time, just let out a sharp gasp. Her thigh had become raw, turning red where Celestia had hit her.

Celestia ran one latex-covered finger up the welt, slowly. Twilight shivered.

She leaned in to Twilight's ear, whispered: "Let's continue."

Stepping back, she levitated the next piece of the armor over, showed it to Twilight, let her get a good, long look. This one was the articulated, sculpted collar.

Celestia forced Twilight's head up, exposing her neck. The molded metal fit tightly around Twilight's throat; she locked it in place. Latex spread up her neck, down her collarbone, stopping just short of her shoulders and just above her breasts.

The feel of it so close to her breasts made Twilight utter her first moan. Celestia came up behind her, whispered into her ear: "I told you you would enjoy this. Stop fighting it. Give in to our king's will."

"N-nev—"

Celestia's right hand snaked under Twilight's arm, sliding up her chest, the latex cool against her bare flesh. It was around Twilight's breast before she could finish her thought.

Celestia gave her a squeeze, and Twilight let out a second moan. Cupping the breast in her palm, she took her thumb and began tracing circles around Twilight's puffy areola.

"You'll what?" Celestia asked her, as the next pieces of armor broke off from the set and floated over.

"N-N—"

Celestia let the pair of cuisse hang in front of Twilight's face for a moment, then, slowly, lowered them down to her thighs. She let them fall into place gradually, touching first the bottom of the plates against her coat, Twilight shivering under her touch, then let them press slowly into her skin. The straps slid around , binding them in place, squeezing against the tender flesh.

"Ah...ha..."

The latex began to spread. Celestia reached down with her left hand, tracing a line down Twilight's stomach to her crotch as she did so, stopping just short of the mare's clitoris. Then, she dipped her fingers into the still-liquid material that was creeping up her thighs, ran them through it, helping it to spread.

Twilight let out another moan at Celestia's touch, her loudest yet. Celestia now noticed that her cunt had begun to drip.

Soon, Twilight's legs were completely covered, foot to hip, and Twilight's starburst had been forever sealed beneath its shiny, uniform surface. The mare had shuddered especially when the cool latex had covered the welt Celestia had given her.

Celestia pulled her fingers away; some of the latex pulled with them, semi-solid, forming a sticky trail that eventually broke. She brought them up, pressed them against Twilight's lips, forced them inside.

"Lick them clean," Celestia commanded. Twilight did nothing.

Once again, Celestia swatted her on the thigh. This time, however, when her hand hit the latex, Twilight let out a moan. A spurt of her juices dribbled out of her.

"Lick them clean, slave," Celestia said again. This time, Twilight did as she was told, her tongue running up and down the length of Celestia's fingers, lapping off every trace of the sticky substance that had coated them.

Celestia was dripping now, too, through her suit. Each caress of Twilight's tongue pushed her further and further into her lust.

She pulled her fingers out of Twilight's mouth, a trail of saliva following them. She turned her attention to the armor.

There were only three pieces left, now. The spiked shoulder guards, the molded breastplate... and the helmet.

She took the shoulder guards. They dropped heavily on Twilight's shoulders, tightened into place. The suit spread down her thin, delicate arms, melding with what had already coated her wrists.

The breastplate was next.

"Ss-stop," Twilight pleaded, barely able to get the words out. "Please..."

Celestia paid her words no mind. "This was my favorite," she murmured into Twilight's ear, as the metal pressed itself against her torso, the molded cups supporting her little breasts, pushing them up, out. Twilight gasped at the cold metal on her nipples, already erect from Celestia's playing. Then, her gasps turned to moans, deeper and deeper, as her breasts were consumed by latex, squeezing the already sensitive organs all over, amplifying that sensation.

Celestia remembered the sensation all too well. She also remembered what came next.

As the latex above joined the collar, the latex below began to creep down her stomach, running over her belly button, continuing down, down. As she had with the cuisse, she let her hands drift down, began spreading the material down Twilight's body, until....

"Gah... AH!"

Celestia's fingers pushed the latex over her clit. Twilight's body spasmed in place, but Celestia wasn't done. She continued to push the latex down, down... and then, curling her finger, she began rubbing it into Twilight's dripping marehood.

"AH! AH! AH!" Twilight screamed, as more and more of the king's magic was pressed into her. Celestia pushed her own body into Twilight's back, letting their slick coatings rub against each other, each movement of one filling the other with overwhelming ecstasy.

Twilight's eyes rolled back into her head. Her mouth hung open, a constant stream of moans and shrieks pouring out of it. As the latex completed its journey, sealing her from the neck down in a complete, seamless suit of gray, her mind was already on the verge of breaking. She felt as though she was going to burst.

But there was one piece of armor left.

She let the helmet hang tantalizingly in the air in front of Twilight. Celestia's left hand continued to press and stroke at the smooth coating over Twilight's marehood, while her right pushed under the breastplate and kneaded at her breast.

"How do you feel, Twilight Sparkle?" Celestia asked.

"A-a-amazing," Twilight struggled to get out, overwhelmed as she was from the waves of pleasure crashing through her body, battering her mind.

"It feels good, doesn't it Twilight? Being encased in our king's magic?"

"I-it f-f-feels... so good..."

Celestia squeezed at Twilight's breast; the mare shuddered.

"Do you want to feel this way forever?"

"Ah... Y-yes!" Twilight moaned. "Please, oh..."

"What would you do to keep feeling this pleasure?"

"A-anyTHING!" Twilight squealed.

"Would you become King Sombra's loyal knight? Even if it meant betraying your friends, your family? Betraying me?"

"YES!" Twilight shouted. "ANYTHING! IF IT MEANS I GET TO KEEP FEELING THIS, I'LL DO ANYTHING HE WANTS!"

Celestia grinned.

"Swear your allegiance to your king."

"I PLEDGE MY ETERNAL LOYALTY TO KING SOMBRA! I'LL BE HIS OBEDIENT KNIGHT FOREVER!"

As the words were spoken, Celestia brought the helmet down over her head. She stepped back to watch the results.

A bright green glow flooded out from under the visor; Celestia knew that Twilight's vision would be filled with it, the light consuming her mind as the helmet's magic pressed into her thoughts. The gray latex that covered her began to move, to flow, caressing every inch of skin it covered, flooding her with the pleasure she so desperately wanted.

Twilight's shrieks grew to screams as the latex Celestia had pushed inside her began to move as well, flowing up through her, crawling its way around her insides, seeping into her core and corrupting her from within. Her body strained against Celestia's magic, her muscles jerking again and again under the onslaught against her body and mind.

Watching this, watching her master's will being imposed upon this mare, was enough to finally send her flooding over the edge. She fell to her knees as she came at last. The pent-up fluids were too much for the suit to absorb, spurting and dripping through the strange material and onto the floor. Her head snapped back as her body shook and her mind finally gave in to the lust.

One hand went to her breast, sliding under the plate and grasping it, kneading it, pulling on the nipple that poked against its latex covering. The other went to her marehood, smooth fingers disappearing into the latex-lined crevasse.

She rode the orgasms, one after the next, moaning, coaxing them out with each stroke of her fingers against her impossibly-sensitive skin. Across from her, Twilight moaned in response as her mind finally broke, any remaining will to resist obliterated by the onslaught of sensations that had overtaken her mind. She didn't know who she was anymore; the whispers kindly informed her as the green filled her eyes.

Their moans and gasps formed a chorus, coming quicker and quicker until—

"AhH!" Celestia cried out, coming one last time, harder than she ever had before. Her entire body shook.

"GyaH!" Twilight echoed, coming for the first time, a waterfall of pent-up lust draining from her marehood. It dripped to the floor, puddled beneath her.

Celestia's magic disappeared; Twilight fell to the floor, her chest heaving, unable to catch her breath. Still on her knees, Celestia did much the same.

They stayed there, for a time, as their breathing slowed and their bodies recovered.

Celestia was the first to stand. A strand of marecum dangled from her crotch, connecting to the puddle on the floor; she wiped it aside, placed her fingers in her mouth, ran her tongue over them, savoring the salty taste of her own juices.

She looked to Twilight Sparkle, still on the floor.

"Stand," she ordered. Twilight's limbs shook, but she obeyed, coming to attention.

"Salute."

Twilight's hand snapped to her forehead.

Gently reaching forwards, Celestia removed the helmet from Twilight's head.

Her eyes were twin pools of green, a direct mirror to her own.

"Who are you?" Celestia asked her.

"I am Knight Sparkle, loyal servant of King Sombra."

"And who am I?"

"You are Knight-Commander Celestia, leader of his armies," Twilight told her. "My commander."

"And who is King Sombra?"

"My master," Twilight replied. "His will is my will."

"And his enemies?"

"Will cower at my feet."

Celestia, still caught in the afterglow of her obedience, allowed herself a smile. But, of course, her orders weren't quite complete.

"Come," she said. "We must present you to the king."

"Yes, Knight-Commander."

Celestia wrapped her arm around Twilight's waist. Their bodies pressed together, their smooth hips rubbing against one another, sending a fresh wave of heat through both of their bodies.

"Hail Sombra," Celestia said.

"Hail Sombra."