An RP between me and an anonymous other based on a Caroo pic.

Celly and Twiley fall into the clutches of Nightmare Moon. The formatting may be slightly off because this was converted from Skype.

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Nightmare Moon chuckled evilly.
"I have waited 1000 years to see you at my feet, Celestia," she laughed, "And here you are, all tied up and completely at my mercy," she looked down at Celestia, "And I see you brought your 'faithful student' to me as well. It will be good to break her will," she levitated Twilight up.
"What do we have here?"

Twilight jerked in place, restrained tightly both with chains suspended from the ceiling and the dreadful magic holding her over the reborn Nightmare Moon’s lap. She refused to see her gloat, and so turned away demonstratively. The recently alicornized unicorn even attempted to kick her somewhere with the blunt end of the horribly tight shoes all Princesses wore for some reason, but her legs and feet were brought together tightly and barely moved.
“Hrrmf,” was her only reply to the treacherous daemon.
Seeing her mentor the way she was did not elicit many happy thoughts in her mind, either.

Nightmare Moon watched Twilight's struggles with an heir of devious glee.
"Oh Twilight Sparkle," she ignited her horn, "You're going to tell me everything."
She slid off her own shoes and raised her feet, setting them down on Celestia's thighs and wiggling her toes.
"I'm sure my sister's plight will encourage you to talk."

Twilight cast an errant glance on what was happening below, alarmed by the two metal clunks, and averted her eyes in the most chastising roll, refusing to observe Nightmare Moon’s indecencies. She drew in a deep breath and shook her head with dramatic power:
“NEVER,” was her answer – that, and another kick attempt. It failed as well.

Nightmare Moon just smirked.
"Oh, I'm sure I can convince you through the suffering of your mentor," Nighmare Moon's magic engulfed Celestia's golden shoes, slowly sliding them off her petite white feet.

Celestia’s breath slowed as she heard the threatening words. She had refused to give Nightmare Moon the recognition she so eagerly desired from her, not issuing a sound at all the humiliation she had been put through, lying bound in her underwear on cold stone, but this got her to pause for a moment – surely to be noticed by what used to be her sister.
As it became clear that her gilded footwear was quickly sliding off, the Princess gave her captors the first words:
“You unholy daemon! How can you muster the boldness to do such things?”

"Simple, you are at my mercy, and I will do as I like with you," Nightmare Moon laughed, slipping of Celestia's shoes completely and casting them away, "And now for you, Twilight Sparkle."
Twilight could feel the tingling as Nightmare Moon's magic pried the shoes from her feet.
“What are you going to do?!” the young alicorn questioned, continuing to show moderate resolve in spite of the situation.

“What perverted rituals do you plan to carry out, Nightmare Moon?” the older one, wincing at being effectively used as a foot stool, spat in the direction of the nocturnal-black captor.

Nightmare Moon laughed at their pathetic resistance.
"Simple, my dear Tia. I'm going to break you, until Twilight here decides to talk," she gave her massive black wings a shake, causing many loose feathers to drift to the floor. Her magic quickly scooped them up.
"Of course, Tia, I know many things about you," the feathers hovered menacingly, "Things such as... say... your softest ticklish spots," she smirked.

Celestia gasped in panic at what had been said. She was prepared to suffer torture, to tolerate insurmountable pain, to face defeat as a staunch ruler. She was not prepared for THIS.
“No! She will never bend to her will! Ignore her, Twilight!”
The other Princess gulped audibly at what had happened. She was not prepared for THIS either. Suddenly, the removal of her admittedly tight shoes seemed like infinitely less a good thing than before. She jerked her bare feet, dangerously close to Nightmare Moon’s… various ways to torment them should she decline to cooperate.
Which she would:
“I am no traitor, Nightmare Moon! You would have done well to find that out! I will nev—“

"Blah blah blah," Nightmare Moon muttered, removing the shoes from her feet completely. "You are lucky Twilight Sparkle. I will have to find your ticklish spots for myself," Nightmare moon shifted a foot over, giving Twilight's a gentle brush with her toes, "As for my sister, however..." a feather drifted down to her exposed belly and slowly started brushing back and forth, "Remember, you can make this all stop, Twilight Sparkle. All you have to do is betray your mentor, and tell me what I want to know."

Twilight issued another gulp as the gentle brush nearly had her squeak. Her mind was racing with anxiety, but she knew she had to stay strong – perhaps, the vile traitor could be caught off-guard in her gloating, and they could yet escape!
Once she looked at how well her lifelong mentor was faring, her fearful expression had risen in magnitude, significantly.
Celestia’s muzzle contorted into an awkward mix of fear, mirth and stubbornness as the feather made its way over her exposed skin. The Nightmare had retained her sister’s memories. Including THESE.
“Noohoh—“ a weak protest involuntarily left her as she realized what was going to happen should Twilight continue to resist – which she should.

Another feather drifted down and started swirling in Celestia's belly button.
"That's right, Tia," she smirked, "I know everywhere you are even remotely sensitive," she gave a laugh, "If you want it to stop, tell your 'faithful student' to start talking."

“Nnnnooohhhohohohah! Forgehehet me, Twilight!” the Princess ordered what must have been the single most awkward order she ever had to issue in her life.
“Princess Celestia!” Twilight Sparkle cried out at the sight of what was being done to her secondary mother figure, “No! How can I let her torture you so?!” she questioned out loud with a deep sigh, struggling her wrists against the chains, “Don’t touch her! Torture me instead if you so desire!” the young alicorn had slipped into heroics at seeing her teacher’s plight.

"Ohh, so eager to surrender yourself to me?" Nighmare Moon smiled and levitated over a large brush, "How about I just torture you both until one of you is willing to talk."
The brush began stroking Twilight's soles while another feather drifted down to get under Celestia's chin.

“NOO!” Twilight yelped at Nightmare Moon’s comment, “Nononononononono—“ she did the same after seeing the neat, soft-bristled brush.
The bulging panic in her brain gave her a thought – she had no idea what Nightmare Moon wanted to know.
Just out of interest. Of course she would not worsen Celestia’s torment only to relieve herself. Would she?
“Don’t eehehhhheeeeeehehehven COHHAHAHAHHHAHHAUNT ON EEEHEHEEEET!” the Princess of the Sun twirled her head back and forth, horrified at the realization that even a spot so unlikely as this was not forgotten, “Nooohohoo!” she added vaguely, unclear as to whether it was her collaboration declination or her freaking out at the rampant feathers.

"I can stop tickling you, you know, Twilight," Nightmare Moon smiled, working on a way to break her loyalty. "But it will come at a cost." Two feathers waved above Celestia's feet. "Its your choice." The brush at Twilight's feet began to spin faster.
“Gwaaahahhheehheheheh!” the younger Princess squealed in anguish, incapable of driving her treacherously sensitive soles away from the spinning bristles, “Whhahehheheat do yoHHHAHAHH—“ her loss of control was cut short as the brush went far too deep over to the arches.
Celestia’s whole body stiffened up as she watched the black feathers levitate threateningly over her exposed feet. She bit her involuntarily quivering lip, stifling the laughter from all the other places she was being tortured in, and managed out a:
“Stahahahay strong!”

"I'll take it that you want me to torture your mentor more," Nightmare Moon smirked and lowered the feathers to Celestia's feet, "Or else you would have said something," the feathers began to give light touches to the heels of Celestia's feet.

It was abhorrently hard to whimper in fright when feathers were already assaulting her damningly sensitive chin and explosively ticklish belly button, but Celestia had managed that at the first touch on her feet. At that moment, every figment of her being wished for it not to continue, but nevertheless:
“Nooohohohhhoooo DON’T DON’T DON’T,” she exclaimed, whether to Nightmare Moon or to Twilight it was not clear.
Twilight Sparkle had shut her eyes tight and was waving her head frantically, laughing out loud at the mere bristles on her soles. The teasing of her captor made it infinitely worse, as she realized that the only way to stop the dreaded torment would be to betray Princess Celestia. She would never do that.
“WHAHAHAT DO YOU EEEHEHEHEEVEN WANT TO KNOOOHOW???”
Never.

"Everything," Nigtmare Moon whispered into Twilight's ear.
The brush on her feet moved up to her arches, spinning even faster. Celestia's feet fared no better, the two feathers shifted upwards from her heels to her soles. To prevent her from curling her toes effectively a third feather drifted down and began to feather the tops of her feet.

The tormented young alicorn had not laughed this hard in a very long while, and something told her that it was merely starting to take shape. The brush on her arches made her want to crawl away and hide under a blanket, but the physical and magical restraints, keeping her suspended over the daemon’s lap, prevented that, and she was left with the thought of her whole ticklish being appearing completely open to the devious captor. She shook her head so hard she could well have gotten a bit of her mane into the teasing Nightmare Moon’s eye.
“EEEEEEEEEAAAHHHEHEHEH!” she managed to open her wide, watering eyes and do her best to glare at the nocturnal alicorn, “YOOHOHOU ARE EEEEEEKKHHEEHEEEEVIL!” was the information she gave her.
Celestia struggled and struggled against the tight ropes, but nothing came of it. Her magic was useless, everything was useless – her fallen sister had reduced her to a laughing mess, an object of barter. Not only was that furiously humiliating – she sincerely hoped that no one else from the kingdom she had failed was watching – but it also left her laughing her poor head off. The movements of the feathers over her body mixed with each other, creating a great tickly ball of torment that wrapped all around her. And she knew that these were not even remotely all the spots that could make her squeal.

"Thank you for the obvious information, Twilight Sparkle," Nightmare Moon laughed, "But alas, it is not the information I want," several more feathers drifted down towards Celestia. Eight slotted themselves between her toes but remained still, another two hovered at her armpits.
"Either you talk, or your mentor gets it."

“Nooohohohoho, nononoono, not thihhhhhhihhhihhiis…” Celestia shut her eyes in dreaded anticipation, nothing but sheer power of will preventing her from going, “TWIIHILIGHT PLHEEAAASE!”
Her eyes shot back out of the dreaded anticipation when she realized that her horribly drained mind just mixed it up and said it out loud. To recuperate the status, she added:
“DOOHOHOHONT!”
“I HAHAHAHATE YOUUUU!” Twilight squealed, not at all showing the horror she felt at seeing the ordeal she was putting her mentor through. Just watching her lose it with laughter, but still order her not to succumb, was heart-rending.
At least the brush on her feet was there to take her mind off it. She was always taught to see positives in the direst situations, after all.

"Oh well," Nightmare Moon shrugged, "I guess she deserves it anyway."
The feathers started sawing back and forth between Celestia's toes and brushing in her armpits. Even her wing joints were not safe, as two more feathers materialised and started to wiggled deeply into that spot. Nightmare Moon wiggled her toes as she watched.
"Remember, it all stops when you decide to talk," a few more feathers hovered menacingly around Twilight's feet.

“PLLEHEHEHEHEEAASEEE!!!” Celestia went positively cracked with the sensations, teasing her murderously through the tight restraints, forcing her to experience the worst tickling she had ever receive in her long, long life. Her iron will was slowly draining away bit by bit.
But not yet.
“NONONONONOOOO!” rather soon, though, she realized when the feathers made their first movement through all of her toes all at once.

“No! You will stop thAEHHHEEH—“ Twilight cursed herself internally, having accidentally brushed her questionably exposed side against Nightmare Moon’s placid wing. She sincerely hoped that the evil alicorn was too busy gloating over their torment and listening to Celestia’s helpless laughter to notice.
She already had two more terrifying problems at her feet, she did not need more. To check if they were still there, Twilight moved her head a little, and realized a horrifying truth.
First of all, the clock on the wall indicated that it had only been going on for ten minutes. Second, Nightmare Moon was not even using her hands yet.

Nightmare Moon had felt Twilight brush her wing and noticed the reaction.
"Oh, looks like I don't even have to look for tickle spots, you want to do it for me," she smiled a raised a wing, gently feathering Twilight's exposed side. She was tempted to use her fingers... but that could wait.
Meanwhile, the feathers in-between Celestia's toes began to alternate their movements, while the ones on her arches and soles started to brush deeper. The one under her chin began to seek out all her sensitive spots in that region, while the ones on her belly homed in on her belly button. The armpit ones kept swirling quickly.
"Talk and it ends," she giggled, wiggling her toes before Twilight's eyes.

“NOOOOHOHOHOOOOOO WHYWHYWHYWHYWHY,” Celestia kept trying to scream in-between sessions of heavy laughter, having all but officially turned from an all-powerful Princess of the Sun into a regular ticklish mess, “PLLHEHEEEAAASSEEEEE!”
Once the feathers at her neck and feet dove in deeper, she even gave a particularly rough tug on the restraints, feeling the stone pedestal she had been secured upon move from its place. But despite having moved over a ton of solid stone, the ropes stayed intact, no doubt enchanted.
“EeeepehehehheeeehahahEEEEEEK!” the other alicorn blushed awkwardly, skipping between laughter-sobs and laughter-squeaks. How could she betray her mentor? How could she say what Nightmare Moon wanted to say? Oh, she was not taught to handle torture like this at all.
“IIHIHIHIH DON’T EEHEHKHAAVEN KNOW WHAT YOU NEEEAAAAAAAAAAAHHAHAHH! YOU AREN’T HEEEEHEHEHHE SPECIIIIIIIIIIIIIIIII—“

"What was that?" Nightmare Moon asked, pretending to listen, "I couldn't understand through all that laughter," she leaned forward a little, "Here, let me help you," she raised her hands and began squeezing Twilight's sides, digging in her fingers when she could. Meanwhile,her feet shifted up to Celestia's belly and began to wiggle their toes gently on a soft spot just above her pelvic region.

“Oh no nono,” Twilight’s eyes turned large and very watery at the sight of Nightmare Moon’s fingers encroaching her sides, which had already seen torment from the teasing feathery wing. Why, oh why did she choose to wear an outfit that completely exposed her belly button, sides and armpits?
“WHYYYYYY?!” Twilight Sparkle agreed with the sentiment vocally even before Nightmare Moon’s fingertips landed on her sides, “YohohouarentehehehheevenaskIIIIIIEHEHEHIIIINGQUESTIOOAAAAAAH—“
“AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHHHHHAAHAHAHAH!” the Princess of the Sun let out her loudest shriek yet, falling into agonized silence shortly afterwards to compensate. Her lungs and hearts beat helplessly as her stomach quivered under the relentless assault. The combination of the teasing, the humiliation, the tickling, and the reality-defying torturous feeling just under her hip made her break first tears. The liquid drops flowed from the once-majestic alicorn’s eyes as her mouth was locked in a permanent grin, sometimes opening to make an utterly silent yelp.

"Because you're not talking sense," Nightmare Moon giggled at Twilight, watching her toes. Her fingers started moving inwards towards Twilight's belly button, tickling as they went. The brush continued to spin on Twilight's feet, moving up and down from her heels to her arches to her ticklish toes. The feathers continued to taunt Celestia, getting faster and faster. The ones on her feet had started using the quill ends to scribble on her soles and poke at and between her toes.

The young alicorn’s eyes turned bigger and wetter with each passing second of watching Nightmare Moon’s fingers crawl towards her belly button. She was laughing hard enough already, just barely managing to think through the ordeal on her feet, but this? Her attitude dropped hard as she turned her puppy eyes towards her captor:
“Ahhhahahahahask ssomethEEEHIIHIng! EEEEKKKKK— EEVERYTHING ISN’T SPECIIIIIFFIIIIIAAHHHHHHEHEEE!”
The only sounds coming out of Celestia by that point mostly belonged to the stone she was bound to – the massive piece was shambling here and there, moved around by her helpless struggling. She was no longer laughing – her lungs had ran out of air to expend, and her breaths had become exceedingly rare. The only reason she retained consciousness to gape her mouth like a fish and release streams of tears from her eyes was that her body was naturally extremely resilient.
But once the intensity had risen, and the quills at her soles had begun to poke and scribble, she had actually managed to pull out a very silent squeak.

Nightmare Moon leaned close to her.
"Where... are... the... Elements," she punctuated each sentence by increasing the speed on the feathers between Celestia's toes, "Better answer soon," ahe giggled, "Your Princess is about to die laughing."
The feathers between Celestia's toes were literally a blur.

Twilight’s heard dropped, metaphorically. Physically it already has, a long time ago.
At long last, she had released her first tears as well, the strain of the torture too much for the poor laughing alicorn. The relentless assault on her belly button and desperately flinching soles was horrible by itself, but she would have resisted, even if that meant passing out and waking up to a new day of torments. Having to watch Celestia suffer so heavily, who all the while was begging her not to give in (while she still could talk, that is - at that point it was unlikely that she shared the sentiment), and being effectively responsible for the terrifying ordeal she was put through brought her to the edge. She did not know if she would betray her by allowing the rampaging feathers to continue the tickling, or if she would do so by telling the daemon what it wanted, but now that she knew what it wanted… she would have to betray her friends as well.
“NNNOOOOHOHOHHOOHH! STOOOP!” she tried to twirl in her restraints, effectively giving Nightmare Moon’s fingers a free ride over her upper body, even getting them to the wing joints (good work, Twilight). Her head shook with such intensity that a few tears must have hit the dark alicorn’s face.
The Princess of the Sun, in the meantime, had nearly gone numb from the ordeal put upon her. She could barely think, the only coherent thought coursing through her mind being “STOPSTOPSTOPSTOPSTOPSTOPSTOP”, and most of her energy was used up by frantic attempts at breath.
To her credit, once she had managed to listen in to the question Nightmare Moon put before Twilight, she did attempt to tell her student to abandon her, yet again. Too bad she couldn’t talk.

Nightmare Moon just laughed and wiped away Twilight's tears from her face.
"Hurry, Twilight," She teased. "Your mentor can't last much longer."
The feathers between Celestia's toes somehow moved even faster, while the quills on her soles became a storm of activity, targeting her weakest spots.

The Princess that remained operational let out a heart-wrenching combination of a squeak, squeal and whimper at the prospects strewn out in front of her. She was not only being tickled with intensity that Celestia herself could be jealous of, she was also being put through severe mental torture.
Finally, she gave up:
“FIIIHIHINE! FINE! I’LL TEHEHHAHAHAHAH— TELLYOUJUSTSTOOOHOHOHOP!” Twilight managed in between bouts of being foot-brushed and belly-tickled, “I CAHAHANT TALK WHEN YOU’RE TIIIHIHIHICKLING MEEEE!”
Celestia, in the meantime, just gave up and had accepted the remainder of her life as an intermittent tickle torture, and primarily focused on continuing to breathe. In some way.

Nightmare Moon made the feathers retreat from Twilight's body but kept the brush at her soles twirling slowly. Nothing changed for Celestia.
"Well then, I'm waiting," she tapped her foot against Celestia's belly, her toes finding the belly button.

Twilight gathered her breath weakly, taking in the air of utter defeat. And a copious amount of alicorn sweat. At least it smelled nice.
“Ssc-heheh… sc… Scarlet.”
She took a labored look at the clock on the wall. Slightly over half an hour. It was going to be over now.

Nightmare Moon smirked.
"Are you sure?" the brush at Twilight's feet spun a little faster, Celestia's tools hadn't even slowed down.
“Yehehes! Scarlet!!!” her eyes widened as she watched the tickler’s smirk, “Plehehease! Cuhuhuht it out! You’re tohohphhehehehe— torturing her!”

"I know," Nightmare smirked, but let the feathers around Celestia and the brush at Twilight's feet drop to the floor.

Twilight let out the biggest sigh of relief she recalled herself having to date. She slumped back and swung on the chains holding her wrists together in place, her legs falling on the dark alicorn’s lap. As she regained some of her breath, she mumbled:
“That… was intense.”
Celestia laid in place, also learning to breathe again. Her stomach continued to convulse under waves of phantom laughter, but her body was turning to normal. Within the next ten minutes, anyway. For the moment, she only wanted the restraints to be off, so as to curl in a ball and shield her feet from the nonexistent sensations.

Nightmare Moon leant forward and gave one of Twilight's feet a kiss before standing up.
"I hope you enjoyed yourself. Next time I won't be so merciful."

“You… are suspiciously good…” Twilight nodded weakly at her chains, jerking slightly at Luna’s motion, “…at being evil.”
The other Princess had by then managed to get her breath into a semblance of control, and was able to make sounds again. The first ones she did were weak laughter and a couple of moans.

"I had lots of practice," Luna smirked, looking down and gesturing at Celestia, whose feet were still twitching as if being tickled.

“None of that… was even in the script… phhhhfffffshh…” the young alicorn blew a wettened piece of her mane from her eyes, “We were supposed to tickle you… and it was supposed to only be ten minutes… and you… oh my.”
She avoided pointing out that neither of them resisted or used their magic. The rings on their horns were decorative.

Luna smiled deviously.
"It seems you enjoyed being tortured," her eyes were drawn back to her sister's feet, "We should do this again some time."

“Not… not very soon,” Twilight protested, rattling her chains for attention, “Right now, I need a blanket… and Celestia needs a hug.”

"Mmmm," Luna let the dream world she had created fade from around them, and a blanket materialized for Twilight, "My sister will be fine, she had endured more," she gave Celestia a nudge with her bare foot.
"You should visit me again sometime, Twilight Sparkle. I hear that real tickling is far better than dream tickling..."

“More than that? Phhhosh,” Twilight curled the soft fabric around herself, her body still feeling the never existent restraints, “Just how much stuff was going down one thousand years ago? I mean… phew.”
She allowed herself to rest on the couch she had been positioned on this whole time. Celestia, breathing heavily on a pile of pillows strewn round the floor, was showing signs of having fallen asleep from what she had to endure in what was effectively still a dream.
“I don’t think I’m ready for THAT kind of treatment in reality… yet,” she smiled weakly, “We can always train, though."

Luna stepped over and leant down, giving Twilight a close hug.
"At least alicorn sweat smells good."
Then she walked over to the still panting Celestia and pulled the remaining feathers from between her toes. "Pony up, Princess."

Celestia flinched in her sleep, curling up into a ball much like she wanted to. It was highly unlikely that she was going anywhere on her own for the next few hours. Good thing it was a relatively free day.

“Hehe,” Twilight blushed a little, having admittedly enjoyed both the hug and the memory of the feeling on her sides back then just a bit too much, “Thanks. Now… If you don’t mind… I am rather sure that both of us are out of commission. Handle the work for the rest of the day, could you?” she summoned her puppy eyes back up, “I mean, I’d love to get my nose into some tax laws, but… We need some time to catch our breath. And take a shower.”

Luna smiled.
"I will leave you to your dreams then. I must return for night court. I shall tickle you again soon Twilight Sparkle. Keep your soles soft and your toes ready."
She started to fade out of existance.
Twilight gulped with anxiety.
“Yeah… you do that. On our terms next time, if you will,” she added, even though Luna was already gone.
If she ever got to the point where her fingernails went at her soles, she was not sure if that would have fared well for either of them at all. Twilight knew that she could get… explosive, when excited.
For the moment, though, she just dragged Celestia onto the couch and dozed off with her in a comforting hug.
Admittedly, she was looking forward to Luna fulfilling her promise quite a bit.