Chapter 1: A Waking Nightmare
Princess Luna lay on the ground, soon coming to realise that she was sleeping... On a stone floor. And aching in numerous points of her body, she noted to herself with a sigh.
"Nnnnghhh... Did I fall out of the bed?" She thought to herself, hardly stirring as she raised her head groggily, the insides of her eyelids turning red as she frowned, rearing her head back at the uncomfortable sensation of sunlight, eyes opening in surprise "Nnnngh, must have woken up earl--" She muttered, before gasping, eyes widening in horror and fear. Before her, there lay a portal, dark as night, swirling vertically. Various runes were shimmering in the air around it, and she recognized it, instantly jumping to her hooves and trying to rush over to it to shut it down "Nightmare magi---GAH!" she squeaked, as the rattle of chains sounded, and she fell over, her legs held more or less in the same place by chains, which came through small portals in the ground, too small to fit more than a portion of a hoof through.
She turned to point her horn at them, but just couldn't manage to summon up the magic to destroy them... She came to a realization in moments, eyes widening in horror at the realization that she had been well and truly trapped, a simple glance proving to her that her wings were bound by chains too. "These chains are enchanted to inhibit magic!" She thought fearfully, struggling with her superior Alicorn strength against the chains, the mere force in her movements enough to easily destroy buildings, even the strongest buildings that the faraway and unknown species of Humans could muster.
Still, the chains would not budge, as she felt numerous tentacles begin to massage her flank. She froze in fear, eyes widening and teeth clenching as she slowly turned her head, coming face to face with one of the beings she hated the most. A Nightmare. It's form vaguely imitating a pony's, with many tentacles jutting out of it.
"Ahhh, finally, she awakes~" She heard the Nightmare coo, before grinning, baring a jaw filled with razor sharp teeth.
Luna's hairs stand on end as she stares into the Nightmare's pure white eyes for a moment before giving a wordless cry, trying to struggle against the chains and escape, knowing she could easily destroy this being if freed... But it was no use, as she screamed out loudly, eyes wide as she gasped, a black tentacle two inches thick and theoretically infinitely long ramming deeply into her slit, silencing her.
"Ohhh, don't try to run, we haven't even gotten started on the fun~ Don't worry, I won't cause you pain... Instead, I will cause much of the opposite~" The monster cooed, in a voice that made Luna's fur even more agitated, her jaw clenching with her eyes wide.
The Nightmare grinned, and in a few moments got to work, the tentacle ramming a massive twelve inches into her, the being leaping atop her and stroking her teats slowly, tentacles extending from it's hooves and pinching her nipples, causing her to scream out before moaning and squirming beneath it, tears welling up in her eyes as she felt a penis prod against her plothole.
"Oh yes, I hope you enjoy this spell we've cast on you, and most everypony we've caught~" The being cackled, giving her slit a ram and her teats a harsh grope, causing for her to scream out once more, eyes widening and her jaw dropping, panting and squirming as she felt her teats begin to get mauled by the Nightmare's hooves "We've made sure that any... Buldge... From overly large insertions will instead push in another dimension~ And you won't feel half of the pain~ Hell, we could fit this castle inside you, AND you'd still feel pleasure from it~" The Nightmare explained, before chuckling and ramming deeply into her already magically clean ass, pumping without sympathy, the tentacle within her ramming back and forth harshly.
Luna's eyes widened, as she panted, squirming and whimpering as her teats were thoroughly abused, fear growing in her from it's speech, and the sheer multitude of possibilities that it opened up. And then, as she was rammed again, she screamed out, eyes widening as her hind legs shook, panting and arching her back and neck, closing her eyes. The tentacle ramming her was insanely pleasurable, and the somewhat painful feeling of her ass being stretched by the creature's length did add to it.
Just before she was about to reach orgasm, the Nightmare hopped back, chuckling and sincerely amused in a sadistic kind of way, watching the juices leak down Luna's thighs.
Luna paused a few moments, clenching her teeth and closing her eyes tightly as the Nightmare had perfectly timed it; She felt her orgasm cruelly build up without him, and then, right at peak, drop down again. She sighed out in sexual frustration, as the Nightmare chuckled, using a bit of magic to move Luna's chains towards the wall, forcing her to walk as it pressed a hidden button, opening up a secret passage to the outside of the castle, in one of the walls overlooking Canterlot.
Luna blushed furiously, head hung low in humiliation as she panted, before blinking in moderate surprise, not recognizing this passage. It was in all likelihood that the Nightmares had carved it out of the stone themselves. They definitely had the power to do it in the time it'd take her to wake up... She was snapped out of her thoughts by a tug on her collar and hooves, causing her to gasp and resentfully walk forwards, slowly straightening and getting into a prideful position. They could humiliate her, and yes, she could submit to them in private... But in public, she would not be broken. She would not be a symbol of defeat.
The Nightmare ignored what it considered to be a pointless resistance, walking out onto a magical platform which was surrounded by ponies far down on the ground, being forced to watch.
Luna walked out proudly onto the platform, before her pupils contracted and she cringed, in horror and disgust, hearing her sister's humiliated and defeated, muffled moans. Her eyes travelled to the right, and located Celestia, a ball-gag filling her mouth, and blindfold around her eyes. She was blushing furiously, and moaning loudly, even giving a hoarse scream now and then as a Nightmare's tentacles had surrounded her.
She lay on her front, back arched as tentacles had wrapped around and were currently squeezing her teats as hard as they could without causing pain. Two smaller tentacles were stroking her nipples, as her slit and ass were being stretched and rammed deeply by tentacles that were hellishly thick; Five inches. Even worse, was how far the tentacles were pushing. From the smooth and repetitive speed of the thrusts, she could tell that each tentacle was going as far as eighteen inches in, perhaps more. Stretching her mercilessly. A number of tentacles were also indiscriminately rubbing her body, as each and every tentacle was slick with what was either a slime generated by the Tentacles, or Celestia's own juices.
The Nightmare that had her collar grinned, holding out a ballgag and blindfold to her, and moving towards her with them. She simply glared, taking a step back, before she felt her collar forcefully pulled forwards, as were the chains attached to her hooves, causing for her to grunt with clenched teeth, the blindfold going over her eyes much to her distaste, incredibly thin tentacles pushing into her mouth before opening it slowly, at least five Nightmares having to aid the first in opening her mouth, before a ball-gag was inserted between her teeth and sealed.
She struggled against the magically reenforced chains as they spread her legs out, soon forcing her to lay inches above the ground, in a very similar position to Celestia. The screams of her sister filling her ears.
A tentacle slowly traced down Luna's spine, causing her to shiver and struggle harder, giving a short whine as it traced between her asscheeks, gliding over her ass itself before forcefully inserting it's half-inch thick tip a good half an inch inside of her, pulling out moments later. She writhed, panting as the cycle repeated itself, causing her to struggle, trying in vain to clench her teeth as she also felt tentacles trace over her stomach and sides, rub in slow circles around her nipples and gently coil around her neck...
She moaned into the gag as a tentacle dipped into her for a second time, random parts of her teats being slowly stroked by tentacles, a shiver going down her frame as a tentacle brushed against her face, her nipples hard as the sensory deprivation was making all of this much more pleasurable.
She felt the tentacles on her nipples pull back, to be replaced by two tentacles that wrapped around and squeezed her nipples, not painful, but only just. She felt that they were wet with a sticky substance, and she was more than sure that this substance was a portion of her own juices.
She moaned into the gag, eyes widening and arching her back as a two inch thick tentacle pushed into her, going deeper and deeper, all the way to her Cervix. Uninterrupted by any virginity, as she had lost that hundreds of years ago, back when stallions could still be legally enslaved...
Her moans grew increasingly loud as the tentacle coiled up within her, stuffing her with more and more of it's length, her nipples being squeezed and tweaked gently by the tentacles soaked with her juices. Her moans grew louder and louder by the moment, until, to her horror, the tentacle touched one place that caused her to squeal loudly.
She froze, as the tentacles all did too, before suddenly the entire thing thrashed against that point, grinding with all it had against it, another two inch thick tentacle ramming her ass as she screamed out, eyes closing tightly as she came into a deep climax, which the tentacle simply ignored, continuing it's ramming and yet attaching a suckler to her clit, her nipples starting to be abused more than ever as she continued to let off a scream of deep pleasure.
Her hind legs trembled as she writhed, coating the tentacle with a surge of her juices before it pulled back, and she felt it instantly wrap around her left teat, squeezing and beginning to tug on it, being only just gentle enough to not be painful.
She gasped, panting, trying to relax before an exact replica of the previous tentacle began to abuse that spot too, causing for her to scream out as tentacles moved beneath her chest and stomach, holding her in place as she writhed and squirmed in it's grip, a tentacle wrapping around her throat as another wrapped around her horn and began to vibrate, causing her to scream louder into the gag, her juices falling as her screams joined her sister's.
She screamed and writhed in orgasm three times before the Tentacle decided it was covered in enough juices to squeeze her right teat, leaving her body, causing for her to pant and try to collapse into the tentacles holding her up.
Little did she know, that the worst was fast approaching. A two and a half inch thick tentacle rammed her slit, heading straight to and abusing her most sensitive point, before her eyes widened under the blindfold and she screamed louder in pleasure, a second tentacle entering her and heading to that point, causing for her to writhe heavily, panting hard through the gag.
It went further, however, a third tentacle pushing into her and driving her to climax, causing a scream to evolve into a squeak as a fourth pushed in. "How does this even work!?" Luna screamed within her mind as a full eight were within her, by the end. The attention on her teats not letting up, as she screamed herself hoarse while the tentacles within her began to rotate quickly, bringing her to multiple orgasms as she thrashed, eyes rolling back as she struggled hard.
This kept up for a full minute, and, had the gag not been within her mouth, her tongue would have been lolling. The tentacles finally came to rest, becoming still while her eyes returned to their normal position as she gasped for air, moaning as instead of leaving, they simply lined themselves up within her, to symmetrically cover her inner walls.
She then found herself lifted gently towards Celestia, who was none the wiser, moaning into her gag as she thrashed around, climaxing deeply as the tentacle ramming her was slick with her fluids. Luna closed her eyes and looked away, panting, though the occasional small bit of friction within her brought her to a whimper, as they were both tilted so that their undersides pointed each other, moving into a 69 position.
Luna screamed out in climax, arching her back as the tentacles rammed within her, before pressing her face against her sister's soaked entrance as the thick tentacle removed itself, another eight very similar to those within Luna spacing themselves evenly within Celestia. Luna tried flapping her wings, even trying to bite through the gag, though failing. The increasing wetness of her snout causing her to frown in disgust and try to pull back. The tentacles, however, would have none of it, as most of them moved away from her body before being replaced with soaked ones from Celestia, causing her to groan and struggle harder, thrashing out with screams as she was once more rammed repetitively by all eight within her, her teats being squeezed to the verge of pain, her nipples being squeezed even more mercilessly by thin tentacles that had wrapped around them.
Luna panted, before her eyes widened in horror and disgust, the tentacles filling Celestia beginning to pull... Outwards. Sideways, just stretching her wider and wider. Celestia screamed and thrashed in pleasure, some magical effect making her unable to feel the pain of the stretching, allowing her to stretch infinitely without tear, and allowing any bulge to simply push into another dimension.
Luna moaned helplessly, a tentacle wrapping around her throat and forcing her head to slowly enter Celestia, as she felt a similar pressure between her own thighs, the tentacles within her slowly stretching her out and causing her to scream and thrash in pleasure while trying to pull back. Celestia's flesh was just as twitchy, but they could do nothing.
Luna's eyes widened and her back arched as Celestia's muzzle slowly pushed into her, feeling absolutely massive for her size, her fur pleasuring her to no end as Luna tried desperately to pull her hips and head back, but to no avail. They were both screaming and thrashing around in pleasure as well as horror, muzzle-deep within one-another as a waterbreathing spell mercifully put over them so that they could breathe within each other.
Luna's eyes widened and she uttered a hoarse screech of pleasure into Celestia as she felt Celestia's head itself begin to push into her, filling her with pleasure which was unbearable, driving her to at least an orgasm each second, as a piercing sensation heralded a tentacle ramming deeply into her untaken ass, causing for her eyes to roll back a bit as she screamed into her sister, feeling the slope of her own head being roughly forced into her, Celestia's hips twitching and thrashing around as Luna drooled shamefully through the gag into her.
Celestia's insides being spread wide, enough to fit Luna's entire horn in as her head was pushed fully in down to the neck despite her struggles and screams, was all the warning Luna was allowed. Well, apart from the incredibly loud shriek from Celestia, and the accompanying vibrations, before her own insides were stretched ridiculously wide to accommodate Celestia's own insanely large horn, her head mercifully tilted down so as to minimize the amount of space that would need to be opened. Still, the top of the horn ground against Luna, the sensations causing yet more pleasure to the poor mare as she screamed, thrashed, and generally rammed her body against Celestia's, the insides of both mares twitching and releasing floods of liquid as they were stretched beyond anything they were naturally intended for.
Luna's eyes rolled back as she closed them, drooling into Celestia as she felt a tingling around her own slit and Celestia's, before they began to re-tighten until they tightly hugged the other sister's face, causing for them to both scream out and thrash against each other, in an extreme 69 and unable to escape it no matter how hard they pushed.
Luna shuddered with a moan as a tentacle brushed her nipple, all of the tentacles removing from them as they were allowed to twitch within each other. Occasionally screaming out.
"Her... MANE!" Luna thought, squealing out and trying not to move as the feeling of Celestia's mane waving within her brought her no end of pleasure, causing her to writhe, which just caused a chain reaction of Celestia doing the same, juices from both princesses leaking through their gags, both forced to taste each other as they screamed in orgasm, thrashing around as tentacles wrapped around their teats and rammed roughly and deeply up their asses, before carrying them by those three points onto a wooden object, which started to move as if it were a... Cart!
Luna screamed out, thrashing and trying unsuccessfully to escape her sister, climaxing roughly around her head as she felt Celestia do the same. They could vaguely hear it, through each other...
...The sounds of a crowd. A few cheers, a few jeers, a few screams and moans of pleasure coming from both genders, and, very occasionally, a voice that gave them strength. A voice that gave them hope, and fury.
"All hail Celestia and Luna! After all they have done for you, you cheer!?" was the general message that they got from a few loyal ponies.
Of course, this was all drowned out by the constant pleasure, as they began to buck against each other's heads, screaming out hoarsely as they felt their gags removed from their mouths.