Nightmare's Night

by dirty little secret

Rating: mature
Tags: Dark, Nightmare Moon, Porn, Fetish, Non-consensual, Violence, Princess Celestia, Sex, Anthro, My Little Pony: Friendship is Magic
Length: 7508

In the darkest hour of Nightmare Night, the Nightmare comes to claim her favorite victim.

In the darkest hour of Nightmare Night, the Nightmare comes to claim her favorite victim.

Let the darkness in ... it's not like you have a choice.

Contains: princest, rape, violent rape, vomiting cum, choking, forceful autofellatio, excessive cum, slight cum inflation, domination, degradation, abuse, violence, futa on futa, fake incest, fake rape, roleplay, reformed changeling.
An entry for the Cloptober Wincest Contest. And yes, I confirmed eligibility.

Published 2024-10-27 22:20:06 UTC
Last updated 2024-10-27 22:20:06 UTC

Nightmare's Night

Celestia awoke with a violent jolt. She couldn’t breathe! Hands around her neck! She tried to rise, but couldn’t – a heavy weight pinned her down.

In the unnatural pitch black that had smothered her chambers, two slitted eyes opened, glaring down at her with pale blue light. “Aw, caught by surprise?” an all-too familiar deeply reverberating voice said. “Did you miss me?”

Her drowsiness instantly gone, Celestia fought to light her horn ... and got only sharp pain in return.

“Oh I wouldn’t be trying that if I were you, not with a nullification ring in place. The more magic you feed it, the more deeply it embeds into your horn.”

Trying to twist out from underneath the fiend, Celestia squirmed and pulled ... but it was in vain. Why did she feel so weak now? Had her connection to the sun already been broken? She looked up again at those terrible, baneful eyes. “What ... what do you want from me?”

Nightmare Moon tore the bedsheets away from her. “You know exactly what I want.”

“No! I—”

Nightmare’s strong arms yanked her up, twisted her around, and threw her to the marble floor with a horrible crash. She’d landed directly on her left wing. Immediately, sharp pain lanced through it – she hoped it wasn’t broken.

Armored hooves clanked against the marble, stopping just over her. “Now... Let’s have a look at you...”

Cold light bathed the room from behind Nightmare. Almost like a tiny moon. Celestia gazed up at the silhouette of what was once her sister. Taller now, much taller, she loomed high above Celestia’s undignified sprawl on the floor. Nightmare’s body had formed into outrageous curves, punctuated by the wicked outlines of her blue armor. A billowing blue mane and tail constantly moved around her, allowing the light to pass through them. No other details broke that silhouette ... not that it mattered. Celestia knew her sister’s body would have turned black as midnight anyway.

“My my my,” Nightmare cooed appreciatively. “Just look at that lingerie you’re wearing to bed. One might almost think you wanted this to happen.”

Celestia shook her head, pushing herself away along the floor. “It’s ... it’s only a nightgown.” It was only the same pink teddy she normally wore. She got her hands underneath herself, ready to lift herself back up.

Instantly, Nightmare was over her. An armored horseshoe slammed into her chest just above her breasts, knocking her back flat against the floor. The hoof painfully slid up to her throat, pressing tightly.

“Did I tell you to get up?”

Celestia grabbed at the hoof crushing her neck, but it was beyond her strength to move it in the slightest.

The pressure increased. “This will go much easier for you if you learn your place and submit, Princess.”

Still, Celestia struggled, her bare hooves scraping uselessly against the smooth stone floor.

“Good.” Nightmare let out a livid, echoing laugh. “I was hoping you’d choose the hard way.” She took her hoof off Celestia’s throat, reached down, and flipped her over, dropping down to roughly sit atop Celestia’s fragile wings. She yanked Celestia’s head up, pulling her horn for leverage. And she whispered in Celestia’s ear, “As enjoyable as it will be having you as my submissive bitch, willfully catering to my every deviant whim ... getting there will be even better.”

Celestia squirmed, but couldn’t move. “What ... what do you want from...? I can’t!”

“Still playing dumb?” Nightmare suddenly pushed Celestia’s horn forward, slamming her face into the floor, grinding her muzzle into the cold hard stone. “You’ll find out soon enough.”

Armor clinked and fell to the floor. A heavy, warm weight thudded down between Celestia’s shoulder blades, drooling onto the back of her neck as it rested against her. Celestia tensed at the unmistakable feeling of a massive cock against her back.

“Ah! I do believe you’re beginning to understand now, aren’t you?”

With great effort, Celestia managed to twist her head to the side. Her lips still pressed against the marble, but she could move them enough now to speak. “Sister, please! This isn’t—!”

“Silence!” With a sharp crack, Nightmare’s hand came down to slap the exposed side of Celestia’s face. “I have no sister. I have only an insolent slut in need of taming.”

Celestia reached out across the floor, grabbing for something, anything, maybe something to use as a weapon. Nothing, nothing except the fuzzy horseshoe slippers at the edge of her bed. No help at all. She turned her eyes upward, pleading. “Please! You don’t have to do this!”

Nightmare brought her face directly against Celestia’s, licking the cheek she’d struck only a moment ago. “You’re right. I don’t have to... But you do.”

Leaving Celestia in a sudden lurch, Nightmare stood up and stepped off of her. Celestia tried to get up, but only managed to raise herself to her hands and knees before Nightmare’s iron grip closed around her horn, dragging her head-first toward the bed.

Celestia’s knees skidded across the floor, her hands scrambled to hold herself up. There was no resisting the pull.

Nightmare sat down on the edge of the bed harshly, making the springs creak and bounce. Between her outspread legs, her huge dark cock bounced as well, still drooping downward, only half-hard. Celestia closed her eyes, trying to avoid the vile sight of it.

“Fellate me,” Nightmare commanded.

Celestia was not given the option to disobey. Nightmare’s grip on her horn forced her down, face-to-face with the broad tip of Nightmare’s cock. Tendrils of misty mane, acting like magic, pinched Celestia’s jaw and forced her mouth open.

The desperate last breath she’d sucked in was mostly wasted in a muffled scream as her mouth and then her throat were filled. Nightmare’s cock was steaming warm, and though still slightly soft, more than enough to force her mouth open painfully wide. The hot mass of it packed her mouth and throat completely, leaving her unable to move, much less breathe.

“Hmm... Impressive, you made it nearly halfway on the first try.” Nightmare twisted Celestia’s head side to side on her cock. “Been practicing with the more well-endowed royal guards, have we?”

Celestia shook her head no, causing Nightmare’s cock to bend with her motions.

“I know a liar when I see one.” Nightmare pulled Celestia upward, until only the blunt head of her cock was in Celestia’s mouth, drooling with the foul taste of incestuous pre-cum. That huge cock was rapidly stiffening now, throbbing harder and harder with each beat of the night queen’s heart. Nightmare laughed cruelly. “And I also know a filthy, desperate slut when I see one!”

With a brutal push, she slammed her cock back deep inside Celestia’s throat, barging right past her meager resistance, ignoring her gags and coughs. Celestia was forced to raise herself up now – Nightmare’s cock was no longer so yielding and flexible. Now it was Celestia and her throat who had to be flexible instead.

“That’s it, precious little sun princess. I promise I’ll let you take a breath if you can make it all the way down.”

Celestia didn’t have any choice there. Already, her chest was burning with the need to breathe, and there was no way she’d be able to with the crushing girth of Nightmare’s cock jamming her throat open. She was already nearly at the medial ring. She could do it. She had to do it. She had to make it through this. What would the ponies of Equestria do without her?

Nightmare’s grip on Celestia’s horn eased; she began stroking it sensually, teasing Celestia with pleasure to go along with the suffering. That allowed Celestia to move a little of her own volition. But she knew if she tried to pull back, she’d be punished harshly. There was only one way through this: forward.

Celestia shuddered at the feeling of Nightmare’s veiny shaft slowly sliding down her throat. Clenching her eyes shut even tighter, she tried to ignore her own spasms, tried to ignore the taste of it, tried to ignore who was doing this to her. She focused only on her goal. Reach the sheath. Breathe. Endure for Equestria.

She forced herself to swallow and swallow, forced her own head forward. Nightmare’s cock thickened near the base, making it even more of a struggle. Seldom had Celestia ever been so challenged in the past, but she persevered. She had to.

It felt like the swollen tip of Nightmare’s cock was prodding at her very stomach by the time Celestia made it near her goal. And still, she didn’t feel Nightmare’s sheath yet. Opening her eyes did nothing to help her – it was still dim in the room, and her eyes were so full of tears that she saw nothing but a blur anyway. But she had to be close. Just a little more... Just a little more, and the agony could be over...

Slimy spit sputtered from around her lips as she coughed and gagged uncontrollably, but in one last desperate effort, she finally did it. Her lips touched a firm, fleshy warmth and could go no further – she was kissing her sister’s sheath!

Immediately, she tried to pull back. Immediately, Nightmare’s hand went from stroking back to an iron grip. No matter how much Celestia struggled and sputtered, she couldn’t move. She was absolutely locked in place.

“Remember when I told you that you could breathe if you reached my sheath?” Nightmare laughed. “I lied.”

Nightmare did lift Celestia’s head away then ... but only slightly, before slamming it back down again even deeper than before, mashing Celestia’s muzzle against her crotch. She repeated it over and over, brutally face-fucking her.

“Ah, your throat is a divine cocksleeve, Sunslut!” Nightmare laughed. “I think after all these centuries, you may have finally found your true calling!”

The world went fuzzy for Celestia. Her vision blurred even more than before. There was an odd sensation of disassociation, like it was somepony else choking on her sister’s cock, somepony else’s lungs crying out desperately for air, somepony else’s cock growing hard and pussy growing wet from the abuse. She was like a passive observer in her own body, allowing her gag reflex to run wild, allowing her body to do what it wanted. Instead of supporting her weight, her hands moved downward and began stroking her own cock through her nightgown. It didn’t matter – it was all happening on its own.

Even when Nightmare’s tip flared deep inside her, prying her open from the inside, even when Nightmare’s cock slammed as deep as possible one last time, even when it rhythmically throbbed, pumping hot streams of cum into her, Celestia didn’t even blink. She was able to stare blankly at her sister’s shuddering lower belly. She tasted the excess cum welling up from her throat, and she thought nothing of it. It was merely another arbitrary, meaningless sensation happening to somepony else. Irrelevant.

The spell was broken, though, when Nightmare relaxed back down onto the bed and released her hold on Celestia’s horn.

Herself once more, Celestia instantly pulled away. The cock in her throat slid out like some grotesque serpent, trailing a thick, sticky line of residual cum as it went. Celestia could feel every ridge and vein of it on the way out. And, finally, the massive flared tip. Now that she’d spilled her seed, Nightmare’s tip was soft and flexible again, but the flare was still enormous and got caught in Celestia’s mouth before she forcibly yanked it out.

Though Nightmare collapsed back against the bed, panting and recovering, Celestia was in no condition to escape. She could barely manage mere breathing. She sucked desperate gasps through her sore, cum-coated throat.

Even that would not last long, though. All those ignored and delayed gag reflexes suddenly came back in force, no doubt worsened by her stomach being bloated with churning cum. Still between Nightmare’s legs, she collapsed down to the floor, barely holding herself up as her stomach heaved.

As vile as it may have been on the way in, it was far worse on the way out. Celestia’s whole body clenched and shuddered as she forcibly emptied herself, huge sloshes of soured cum welling up from deep inside. Her mouth hung open, letting the sticky mess freely pour out onto her bedroom floor. Several meals’ worth of it. The puddle spread to engulf her outstretched hands, and it was still spreading. Her fluffy horseshoe slippers were in it as well, ruined now. Just like her. And despite it all, her own traitorous cock twitched, growing fully hard.

Nightmare rose as well, swinging one leg over Celestia to stand next to her. She clicked her tongue. “Disgraceful. Such a waste, such a disappointment. You’re not even a worthy vessel for my seed, Sunslut. Look how much you’ve spilled.” Viciously, she kicked Celestia in the stomach.

Celestia heaved all over again, a fresh wave of gooey cum forcing its way out of her nose and mouth even as she dropped to the floor, her face splatting into her own puddle of cum vomit, her mane soaking into it. She tried to breathe, but sucked in only more cum.

“You know you’ll be cleaning that up, don’t you? I won’t have you wasting any of it. A single drop is worth more than you’ll ever be.”

With shaking arms, Celestia lifted herself back up to her hands and knees. Her face and mane dripped with sour-smelling cum now. She heaved again, but this time it was dry. She’d already emptied herself completely.

Nightmare grabbed Celestia’s horn and yanked her head upward, forcing Celestia to stare up at her. “You can clean it up after I’m done with you, though. For now, I could use a little refresher ... and a nice place to sit.”

Celestia was almost prepared for it when she felt Nightmare’s armored horseshoe against the side of her body. She rolled with it when that hoof shoved her over, allowing herself to land face-up on the floor without quite as much pain as there might have been if she’d resisted.

She had not been able to avoid the cum puddle, though. It now soaked into the back of her mane and her wings. It would take forever to clean out ... if Nightmare even allowed her to clean herself, which didn’t seem likely.

A swift motion of a thick black leg snapped Celestia back into paying attention to the horrors of the here and now, rather than the dismal prospects of the future. Nightmare had swung her leg over Celestia’s body and was squatting down, her tail already billowing over Celestia’s mane.

Once again, Celestia closed her eyes, trying to avoid the sight of her sister’s slit opening as her legs spread, of her sister’s huge and heavy-dangling balls. It was no use. The brief glimpse she’d gotten was already seared into her mind. No sister should ever have to see that.

Soon, though, merely seeing it was the least of her worries.

The smell hit her first – the pungent, nose-tingling scent of pussy. At least she could still breathe. For now. Then it was the feel – plush, wet pussy lips pushed hard against her muzzle and huge warm balls rubbing firm against her chin. And then the taste of it – there was no avoiding the mare juices dribbling down over her lips, into her mouth. Celestia shuddered against the floor as she tasted her sister’s pussy for the first time.

Nightmare swayed her hips, rubbing her nether lips against Celestia’s face, spreading them open in the process and dripping even more juices down. “I expect more effort from my royal whore,” Nightmare said. She plunked the length of her still-wet cock into Celestia’s cleavage from above. “This doesn’t end until I am fully satisfied in every possible way.”

Begrudgingly, Celestia opened her mouth. She began running her tongue along her sister’s drooling vulva.

“That’s better.” Nightmare hummed in satisfaction. “Now go deeper, Sunslut.”

With a wince, Celestia stuck her tongue out as far as she could, plunging it up into her sister’s hot, acrid-tasting pussy. Nightmare’s tight entrance squeezed her back, covering her muzzle in slick juices.

Despite the sheen of cum still covering Celestia’s muzzle, Nightmare seemed to have no worries about accidentally impregnating herself. No doubt she’d already taken magical precautions. At least that was some consolation for Celestia. If Luna ever managed to recover her true self, at least she wouldn’t be dealing with a pregnancy on top of all the guilt. At least Celestia wouldn’t be dealing with the shame of having been instrumental in causing it. Hopefully. Nightmare was many horrible things, but not a fool. She would have taken precautions before doing this ... wouldn’t she?

“You’ve obviously had more experience sucking cock than eating pussy,” Nightmare said with a derisive huff. “If you can’t be good at anything else, you could at least be good at being a slut. You don’t want to be entirely worthless, do you? Here – how about you give these a try instead?”

Celestia didn’t have to wonder for long what Nightmare meant. With a twist of her hips, Nightmare slid herself back, pulling her pussy away from Celestia’s tongue and dragging her huge black balls over it instead. And – because what else was she to do? – Celestia licked those as well, gently slathering her tongue over their firm, smooth curves, running it up and down the cleft between them.

“Mmm... Not bad, not bad.” Nightmare laughed. “With a little more practice, you might suffice as a dedicated ball-polisher.” She swayed side to side, knocking Celestia’s face like a double wrecking ball. “How would you like that, Sunslut? You could dedicate the rest of your long, long life to keeping this lovely pair clean. Such a bright future ahead of you!”

Celestia shuddered as she licked and nuzzled. Despite herself, it was getting to her. Her own cock throbbed underneath her nightgown, and her own pussy was no doubt making an absolute mess of herself. What was wrong with her? Did she want this? Was this disgusting thing her sister had become ... right? It couldn’t be. It couldn’t be. It was only biological reactions, only pheromones and instincts. She absolutely could not be enjoying her sister’s swollen sack dragging over her face!

With claw-like hands, Nightmare ripped the nightgown off of Celestia’s body. “Don’t try to hide it. Just look at you, trembling and needy. You’re loving this, aren’t you? All those centuries of lording it over everypony else, when all you really wanted was somepony who could put you in your place, the place you always truly belonged.”

Celestia closed her mouth and turned her head away. No! It wasn’t true!

Nightmare’s sharp fingernails gently traced down the length of Celestia’s cock. Celestia’s whole body shuddered, and her hips instinctively thrust upward, scratching herself badly on those sharp nails.

“Pathetic.” Nightmare gave a cruel laugh. “Who do you think you’re fooling?” She gripped Celestia’s shaft tightly. “You want this inside me, don’t you? Want me to pleasure you as you pleasure me?”

Celestia shook her head no ... which unfortunately rubbed her muzzle back and forth over Nightmare’s balls.

“Too bad. Even if it is nearly as magnificent as my own, your worthless staff will never go near me. It will never touch my inner depths. I am not for the likes of you. You’re very lucky I even consider you worthy for this.” Releasing Celestia’s cock, Nightmare grabbed Celestia’s breasts in both hands, squeezing them together around her own shaft and beginning to thrust between them.

With every thrust, both Nightmare’s balls and pussy dragged over Celestia’s muzzle. Every push drew Nightmare’s thighs together, squeezing Celestia’s face between them and forcing her back into position for the next slide. Pussy juice, stale cum, and her own saliva mixed together into a thick slime, slathering over both her face and her sister’s nethers indiscriminately, forming a depraved lubrication for this vile act.

And the worst part was that Celestia willingly went along with it. She reached her tongue out, tasting the horrible concoction with every swipe of her tongue. But it wasn’t because she wanted it, no – it was only to help end this sooner. The sooner this was over, the sooner she could think about escaping, warning Twilight and her friends, finding the Elements of Harmony, and—

Nightmare stopped moving. She planted her pussy squarely against Celestia’s mouth and lifted her cock up, slapping it in turns against Celestia’s now-exposed breasts. “You always were the bustier one.” She huffed in disgust. “At least now these ridiculous udders of yours are finally good for something.”

Celestia squealed into her sister’s pussy as Nightmare pinched and twisted her nipples cruelly.

Nightmare laughed. “That’s more like it, my little Sunslut.” She slapped one breast hard enough to leave a red mark behind, causing a deep ache as the ripples bounced through it.

Celestia only whimpered this time, her breaths coming in shuddering gasps.

But then, miraculously, Nightmare stood up. She stepped away from Celestia, giving her a moment to catch her breath, a moment to blinkingly open her eyes, a moment to gaze up at the huge expanse of midnight-black cock bobbing in the air above her.

Nightmare smiled down, her teeth sharp and vicious. “That’s right, Sunslut. It’s time for the main event.” She kicked Celestia’s side. “Up! Get on the bed!”

Shaking and shuddering, Celestia attempted to stand. It wasn’t easy, with the floor slippery and her own body betraying her at every turn. Just when she’d almost managed it, Nightmare kicked her down again, splatting her back into the cum puddle on the floor.

“Faster! My time is not yours to waste!”

Celestia scrambled this time, desperately lunging toward the bed, not even trying to stand up first, she just crawled there and climbed up as fast as she could.

She only made it halfway up, her legs still off the side, before Nightmare halted her by grabbing her tail and yanking it up. Celestia squeaked in pain, lifting her ass upward to try and lessen it ... which only allowed Nightmare to pull her tail higher still.

“This is the position you truly belong in, isn’t it? The submissive broodmare, waiting to be bred by her master.”

Nightmare’s huge cock slammed down against Celestia’s back, knocking her downward slightly.

Rubbing her cock between Celestia’s ass cheeks, Nightmare leaned forward, grabbed Celestia’s horn, and pulled it back, forcing Celestia to look at her upside-down. “Tell me what you want, Sunslut.”

“Please... Please just let me go. This isn’t the real you! We can still—”

Crack! Nightmare’s free hand smacked against Celestia’s ass with all her alicorn strength, hard enough to turn her cutie mark red. “LIES! Tell me what you actually want!”

“I never wanted any of this! Please, Sister, I just want what’s best for—”

Crack! A backhand against her other cutie mark this time, drawing out a pealing cry from Celestia and reddening her other side to match. “More lies! You have only one more chance, Sunslut. Use it wisely.”

“I... I...” Celestia shuddered, her cock rubbing and drooling against her own bedsheets. “I want you inside me. I want you to fill me. I want to be your filthy cum-dump and ruin myself bearing your foals.” She had no idea where inside her that had come from, but judging from the lack of a slap, it seemed to be what Nightmare wanted to hear.

Nightmare laughed. “The truth at last!” She drew her hips back, sliding her cock down Celestia’s ass. “But my foals? Don’t flatter yourself. You know you’re not worthy to be the mother of true royalty.” Nightmare’s tip prodded against her spasming entrance. “The contraceptive spell is firmly in place, so-called Princess.” She began pressing forward, straining against the tight fit. “After I’m done with you, I’ll let my followers have their turn, the true Equestrians who are loyal to the Night. And you can carry their foals ... if they feel you’ve earned it.” With a savage thrust, she broke through Celestia’s last resistance, plunging her cock deep inside. “And after they’re done with you ... well ... why should I care how they choose to dispose of their broken playthings?”

Celestia’s eyes went wide at the feeling of her sister’s massive cock entering her, spreading her, breaking her. She cried out, “Luna! Stop!”

To her slight shock, Nightmare actually did stop, instantly freezing. “What did you just call me?”

“L...Luna, please...”

“I have only one name, Nightmare Moon!” She hissed. Hot drool dripped onto Celestia’s lower back. “If you cannot keep that filthy name out of your mouth, then I’ll find something else to fill it with.”

The sharp tingle of magic suddenly enveloped the base of Celestia’s cock. It was like a teleportation spell ... but strangely localized? How could that be? Was it a—

Nightmare released Celestia’s horn, allowing her head to flop back forward and crash onto the mercifully soft bed.

In front of her hovered something decidedly not soft. Her own cock. Obviously and distinctly hers, from the impressive size, the mottled soft pink color, and the gentle curve of it. A little pre-cum dribbled from the end. A portal spell? But how had she—?

There was no time for questions. The tip of her own cock rammed against her closed lips. She could even feel her lips against it! But no. She would resist. She would not allow Nightmare’s depravity to influence her. She would never give in. No matter how much she secretly wanted it, she wouldn’t admit that, not even to herself. At this point, she was desperate for any stimulation, but she absolutely could not admit that in front of her most dire adversary.

It didn’t matter.

With a derisive laugh, Nightmare took hold of Celestia’s wings and slammed forward, sinking the entire length of her outrageously huge cock into Celestia. The moment it painfully bashed against her cervix, Celestia saw stars. She only realized she was crying out in pain when she was abruptly stopped – muffled by her own cock forcing its way into her open mouth.

It was no easier than Nightmare’s had been. After all, her own was nearly the same size. She immediately gagged, but the pressure of Nightmare’s magic pushing on it was relentless and uncaring. Nothing could stop it from sinking deep, deep, all the way down her throat. She couldn’t even attempt to pull away – that would only push her harder back against Nightmare’s savage thrusts.

Tears streamed from Celestia’s eyes. What little breath she could manage was wasted on pathetic whimpering. Her body bulged and churned with Nightmare’s iron-hard cock ruthlessly rearranging her insides to better suit its master’s lust. Her aching throat clenched and coughed around her own cock, perversely stimulating herself with her own suffering. Nightmare’s bigger, heavier balls bashed against her own with every thrust, blending into a cacophony of deep pain and deep pleasure that Celestia could no longer differentiate between. Pain was pleasure and pleasure was pain.

Nightmare yanked heedlessly on her already-injured wings, pulling for all the leverage she could get to enhance her already-powerful thrusts. That enormous midnight-black cock absolutely ravaged her, pulling almost all the way out, stretching her entrance painfully, before slamming back in to beat her cervix into submission.

“Tell me, Sunslut...” Nightmare slammed inward again, holding herself just past Celestia’s limits. “What is my name?”

“Ooomnhaa...” It was all Celestia could manage with her mouth full.

“I told you to keep your sister’s filthy name out of your mouth!” Nightmare pulled back slightly, only to give an even more vicious impact when she pushed back in. “What do you think you will gain by defying me, Sunslut? What do you think you will gain by denying your true nature?”

Celestia reeled with another sharp blow deep inside her. She could practically feel herself tearing open on the inside. If she made it out of this, she’d be sore for months.

“All you have to do is say my name.” Another slam. “Are you too dense even for that?” Yet another. “Are your pathetic, mildly fuckable holes the only part of you that has any use?” She pulled Celestia’s wings until they felt like they were about to rip off. “Say. My. Name.”

Celestia shook her head no ... though she could barely move at all. She made no effort to answer. She wouldn’t let Nightmare have this. Nightmare could do anything she wanted to her body, but she couldn’t force her will.

Or could she?

Suddenly, Nightmare slowed down, pushing in and out slowly, sensually. Her balls caressed against Celestia’s own. She let go of Celestia’s wings, leaning forward to grab her neck instead. But not for a viciously tight choke-hold – no, she gently stroked Celestia’s neck, massaging Celestia’s cock through it. And yet, a viciously sharp pinch of magic struck Celestia just in the base of her balls, preventing her from going over the edge.

“You think I don’t know what you want?” Nightmare laughed. “You think I can’t see your neck swelling from your own flare?” She kept sensually stroking, both inside Celestia’s pussy and around her neck. “Say my name – say my true name – and I’ll let you spill your pathetic dribble.”

Celestia squeezed her eyes tightly shut. “Oooyre Ooomnhaa! Oooyre amhn iii Ooomnhaa!”

“Stupid fucking whore.” Nightmare’s grip around her neck tightened. “Do you really want to get rutted by your sister that badly? So badly you have to pretend she’s here? So badly you can’t admit whose shaft truly makes your body quiver?”

It was too much. Celestia had to release. She had to let go... “Iimhaarhee Ooonm! Iimhaarhee Ooonm!”

“That’s more like it.”

The pinching magic on Celestia’s balls released, replaced by the gentle tingling caress of Nightmare’s mane. Or was it her tail? Either way, it quickly reversed the blocking effect, coaxing Celestia’s orgasm onward, rather than holding it back.

And at that point, it was inevitable. Even if Nightmare had suddenly released her completely, Celestia wouldn’t have been able to stop herself. Her body jerked and clenched against the bed, making instinctive thrusts that went nowhere. Her pussy squeezed Nightmare’s cock as if begging for more. Her own cock throbbed powerfully, refilling her stomach with a fresh spew of cum – less overwhelming, just just as heavy and full. Still with her eyes closed, Celestia moaned around her own cock. There was no point in hiding it now. Nightmare had won. Nightmare had beaten her. Nightmare had conquered her.

Celestia’s legs trembled when her body finally relaxed back against the bed. She was actually thankful for the way Nightmare held her there, or she might have slid off the side, flopping bonlessly to the still-messy floor.

Her now-softening cock suddenly yanked itself out of her mouth. She coughed up a little of her own cum, but thankfully didn’t vomit this time.

“Absolutely pathetic.” After one last tight squeeze, Nightmare released her hold on Celestia’s throat, letting her gasp in desperately needed breaths.

And Celestia couldn’t argue the point. She felt absolutely pathetic. How could she have allowed herself to be brought so low by something as base as sexual desire? Was she, truly, as worthless as Nightmare claimed? Surely a princess worthy of the title would have been able to resist such a simple, debased ploy. And yet here she was, with the taste of her own—

Smack! Her own softening flare slapped messily against her face. “Enough sleeping, Sunslut – now you’ll see to my pleasure.”

Before Celestia could react, strong hands gripped her and twisted her around, flipping her over on the bed. Nightmare’s still-throbbing cock twisted inside her, making her squirm once more in pleasure and pain as her body was forced to adjust to the newly reversed curve of it.

She looked down her body, past the still-jiggling white mounds of her breasts. Her cock was shockingly not in its proper place, replaced by the glowing circle of the portal spell. Which made it all the easier to see the obscene bulge in her belly.

Nightmare held Celestia’s cock up with her magic. Already, it wasn’t drooping quite so badly as it had been before – already, it was beginning to stiffen again. “I think I might keep this,” Nightmare mused. “Not to use it on myself, of course, but I must admit that I’ve found another use for it. A highly satisfying use.” With a sharp-toothed grin, she swung the cock again, battering it against Celestia’s face hard enough to turn her head with it. A bit of residual cum splattered out on impact. Nightmare laughed. “Oh yes. That will never get old. And maybe, maybe if you’ve been obedient enough, I’ll even allow you to suck on it again.” She shrugged and let it drop to the bed. “Or maybe I’ll just toss it in the trash where it belongs.”

Celestia glanced at it, wincing at the thought. After centuries of being an alicorn, she’d gotten, well ... rather attached to her bonus anatomy. Seeing it detached and discarded was concerning at best.

Nightmare brought her attention back with a sharp thrust that smashed her against Celestia’s balls when she bottomed out. “Now, Sunslut... Now you will serve your Queen of the Night in the only way you’re fit to be used. As a mindless fuckable hole. A sewer to drain my excess.”

There was no chance for Celestia to reply, or even to respond at all, before the pounding began. If she’d thought the rutting she’d just gotten a moment ago was ruthless, now she knew it was nothing compared to what Nightmare had been holding back. The entire bed shook and skidded across the floor with every harsh impact. Celestia’s body reeled; she held on to the bedsheets with clenched fists. Her head bounced around as readily and uncontrollably as her breasts – it was far beyond her ability now to hold herself stable. All she could hope for was to survive.

The only thing that held her in place was Nightmare’s implacable grip around her thighs, holding her legs up and out like a wanton harlot. At this point, Celestia surrendered herself to it willingly. She chose to become Nightmare’s plaything, a mere sex toy, a mere hole to be filled. It was all she had, all she could offer the world, after being so thoroughly ruined. The untold damage to her body didn’t matter. She was disposable. She had only one purpose, and once she’d fulfilled that purpose, she could be cast aside without regret. And her purpose was to help empty the heavy balls crashing against her ass cheeks – a temporary relief for Nightmare’s lust, nothing more.

Her head turned to the side as she bounced. She saw her cock rolling side to side on the moving bed, fully hard again, and even beginning to flare. But she couldn’t feel it. She couldn’t feel Nightmare’s grip on her thighs. She couldn’t feel her body jostling against the bed. The only thing she could feel, overwhelming all else, was the enormous flared tip of Nightmare’s cock battering her relentlessly deep inside. Pleasure and pain was a meaningless distinction. All her sensations were meaningless. All that could ever possibly matter was Nightmare’s sensations – how Celestia’s abused and rapidly deteriorating pussy made Nightmare feel. Celestia hoped her randomly spasming and squeezing inner walls would please Nightmare. She hoped that at least in this her life could serve some purpose, however profane it might be.

And that came not from the abuse, not from the intoxicating mix of pleasure and pain coursing through her, not even from Nightmare’s manipulation. It came from love. Love for her sister. Somewhere in that monster, locked deep inside, was her dear sister Luna. And Celestia knew that if she was to meet her end in such a depraved fashion, then at least her consolation could be that she might be able to do this for her sister, to give her sister one last precious gift, however tainted it might be...

“Oh fuck!” Nightmare slammed herself all the way inside. “There’s so much... So much love coming off of you... I can’t...”

With an intense flash of her blue eyes, Nightmare screamed her passion out. Her flared cock erupted directly into Celestia’s womb, swelling her with gush after thick gush of cum. It dwarfed the load she’d pumped down Celestia’s throat – this was something entirely different. This was Nightmare giving her all. This was alicorn biology and dark magic together, straining at their limits with only one goal: fill.

Celestia trembled against the bed. The swelling of her belly was already painful, and it showed no signs of slowing. When she looked, she couldn’t even see the portal anymore. Her rounded belly had eclipsed it, the round white mass of it growing as if Nightmare intended to create a new moon for herself, right there in Celestia’s bedchambers.

Finally, though, Nightmare’s orgasm did slow. Celestia was left sloshing and painfully stretched, but she did not burst. She had her alicorn strength to thank for that. A normal mare couldn’t possibly survive it.

Grinning smugly, Nightmare pulled back, sliding her now-limp cock out. Celestia couldn’t see the cum draining out, but she could hear it splattering against the floor. She could feel the warm flow undulating through her along its way.

Nightmare laughed. “I should have brought a camera. The mindless look on your stupid Sunslut face could keep me entertained for centuries.”

Celestia didn’t even bother to change her expression. Was her tongue hanging out? She was pretty sure it was. But as numb and thoroughly used as she found herself, keeping up any semblance of appearances was far beyond her abilities. Merely breathing was a challenge ... and a welcome blessing. If she was allowed to simply lie here and breathe for a few more hours, a few more days, she might even have some hope of recovering.

Her brief respite was not to last, though. Nightmare slapped her still-gooey cock against Celestia’s slowly deflating belly. “Hm... I’ll need a moment to recover, but there’s no reason a stupid slut like you should have such a luxury. Hmm... Aha!” She reached down and snatched Celestia’s still-hard cock up, holding it in her hand rather than her magic. “This will do! Time to see what you’re really made of!”

Celestia didn’t fight it in the slightest as her sister flipped her back over, once again leaving her lying face-down on the bed, her legs hanging off the edge. Her tail – now heavy and slick with cum – was yanked to the side. And she felt the tip of her own cock prodding at her asshole.

“Oh yes!” Nightmare laughed. “Do tense up, Princess. I want this to hurt when it goes in!”

Celestia yanked her head up. “Caddy wampus! Caddy wampus!”

Instantly, Nightmare pulled away. As Celestia turned over to sit on the edge of the bed, her cock zapped back to its proper place in her lap, the nullification ring on her horn vanished, and Nightmare transformed. She didn’t transform back into Luna – she transformed into Spiracle, a bright yellow reformed changeling.

“I’m so sorry!” Spiracle gushed. “I ... I totally thought you were okay with anal.”

Celestia shook her head and smiled. She took a few moments to simply sit and breathe.

Spiracle winced. “Do you ... do you want to start over?”

Tempting ... but the aches Celestia felt deep inside were already profound. Probably best not to tempt fate. “No, no. That was wonderful, Spiracle. Truly one of the best scenes I’ve ever had in my long life, and I want you to know those are not idle words, but the literal truth.”

She blushed. “You mean it? I’ve, um ... I’ve been practicing with somepony who’s kind of a Nightmare Moon expert.”

With an intense effort of will, Celestia forced herself to stand up. Her legs were even more wobbly than she’d anticipated – and even more cum poured downward from her abused nethers – but she managed to keep standing and even take the two steps necessary to cross the distance and hug Spiracle, pressing their nude bodies together once more. Spiracle was much smaller now, and nearly got lost in Celestia’s cleavage. But she did seem to enjoy the hug, happily returning it with her arms as far as they could reach around Celestia’s back.

“I wasn’t too rough, was I?” Spiracle asked. “I know I was really, um, pushing it with some of that stuff back there...”

Celestia pulled back from the hug and held the changeling’s shoulders. She smiled warmly. “Just as I told you last time, don’t worry about me, dear. I’m an alicorn – I can take it.” Her smile changed to an outright grin. “You simply must tell me where you learned that portal spell, though. That was a stroke of genius!”

Spiracle blushed even harder, covering her face with her hands. “I, um...”

Celestia stared at her intensely, and not just because she was awaiting her answer. This little love-bug was just so adorable when she got flustered like this – it was almost enough to make her want to abandon her usual scene requests and ask for Spiracle’s natural form instead.

“I...” Spiracle shook her head. “I shouldn’t say, Ma’am. I’m not supposed to – how do you ponies say it? – uh, kiss and tell. It’s, you know ... professional standards and, uh ... client conformity.”

“You mean confidentiality?” Celestia said with a raised eyebrow.

“Right, right!” Spiracle smiled wide. “That’s the one!”

Celestia nodded. “Well, far be it from me to breach the confidentiality of your other clients. I know I certainly depend on the utmost discretion, after all. Never mind the public scandal, I would be absolutely devastaed if my actual sister ever found out about this little, hmm, proclivity of mine.”

Spiracle suddenly burst into laughter, doubling over and holding herself.

Taking a step away, Celestia looked down at her. “What’s ... whatever is the matter? Did I say something wrong?”

“No, no,” Spiralce said between giggles. “It’s just that... You know, she wouldn’t...” She fell into another laughing fit and was unable to finish.

‘She’...? Spiracle coudln’t be possibly referring to Luna, could she? No. Luna would never... And why would the idea of Luna knowing about all this be so hilarious? Unless— Celestia’s eyes went wide. Unless... “Spiracle,” she asked very clearly and seriously, “is ... my sister one of your other clients? And, if I may be so bold, what sort of scenes does she request?”

Still smiling and blushing, Spiracle shook her head and held her hand up as if to ward Celestia away. “Can’t say. Confor— Confidentiality.”

“Fair enough, I suppose.” Celestia nodded along. Though now the mystery would eat at her even more deeply. “Well, hm... Thank you, once again, for such a lovely scene. You truly are a master of what you do, and every time I spend a night with you, I’m left in awe. Allow me to see to your payment – I’m going to need a very long soak in the hot springs if I want to have any hope of being able to walk tomorrow.”

“Thank you,” Spiracle said with a slight bow, managing to compose herself. She once again flashed with transformation magic, this time simply transforming into a version of herself, but wearing clothies – her customary little black dress and stockings.

With a smile warmed by very fresh and very pleasant memories, Celestia turned to her bedside dresser to retrieve the substantial bag of bits she’d set aside for Spiracle’s visit tonight.

“And um...”

Bits in hand, Celestia turned to see what Spiracle was saying. “Yes?”

“Um...” Spiracle looked away, glanced back, looked away again. “And, um, good luck with your sister, Your Highness!” She grabbed the bag and darted for the door, as if afraid she’d be chased down the hall.

No chance of that. Celestia could barely move, much less run. ‘Good luck with your sister’ ... what could that possibly mean?

Author's Note

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