"Thou used to be cool"

Celestia found herself staring down her chamber doors, knowing Luna was on the other side, knowing she needed to apologize. Maybe Luna could stand to tone it down a bit, but Celestia definitely needed to tone it up. Her Equestria needed to be a beautiful place of love and pleasure, and Luna knew how to make it so.

She pushed the grand double doors open. "Luna, I—" Her jaw fell to the floor.

Before her was Luna, hanging in the air, suspended by glowing blue tentacles that were probing her every orifice. She writhed in agonizing pleasure, massive ribbed hoses stretching her vagina, anus, and throat as they plunged into and pulled out of her with great force. Upon closer inspection, it became clear that 'every orifice' was not a phrase to be taken lightly, as smaller strands of the slimy animate material were inserted into her nostrils, ears, and even her urethra, pulsing and swirling rhythmically. A muffled cry of pleasure escaped Luna's lips as she noticed her sister at the door.

The tentacle probing her mouth slowly retracted, and Celestia was both disgusted and amazed by the length that had been concealed inside Luna's gullet. At least a full four feet of firm, blue tube, terminated by a rather massive visage of a horsecock. After spending a moment choking down the glowing blue fluid that it had been pumping into her, Luna spoke, a strand of the blue, glowing cum still stretching from the tip to her lips.

"Oh, hello sister, art thou going to chastise Us for our behavior even further now?"

Celestia hung at the doorway, uncertain.

"Do not tarry, let Us have it so that We may carry on with what We were doing," Luna insisted, the cradle of tentacles lowering her down to Celestia's level, and the penetrating bodies continuing to probe her in a slower, more delicate way so as to allow her to speak easily.

"I... Uh..."

Celestia had intended to join Luna in sexual endeavors, but this was a lot more... advanced than what she was expecting. She walked a little into the room as she continued, "you see, Luna, I wanted to apolo—"

She stopped abruptly as she stepped in something slimy and sticky, the excess — shall we say, 'moisture' — that had pumped out of the creature, and into Luna, before spilling out onto the ground. She grimaced and retracted her hoof before she continued.

"Apologize. I wanted to say I was sorry for how I treated you in the courtroom."

"We see..."

"I just... I feel that you may be right. Equestria is too shameful. And, perhaps, things will never be as they once were, but I would like it if... If you would help me to put things back, maybe just partially."

"We see," Luna replied, leaning back and folding her arms, taking on a stance so formal and serious that it almost seemed impossible that she was being double penetrated. "Are you sure?"

"Yes. I think I am sure," Celestia replied hesitantly, eying a tentacle that was creeping up on her left side.

"You think?" Luna asked, giving Celestia an apprehensive look. Even the tentacles seemed to be staring Celestia down suspiciously.

"I... I know."

"Well then, prove it. Join Us," Luna insisted, a few more tentacles moving in on Celestia.

"Oh... No— I... You go ahead," she replied, retreating.

"If thou art serious about restoring Equestria, then you will join Us."

"I think I'll just work my way up to this, you know..."

"There is no time for that, sister. We have two-hundred years of repression to work off here."

"One-hundred and tw—" Celestia began to protest, before one of the tentacles worked its way around her and began gently rubbing at her groin. She wanted to pull away, but the feeling was so wonderful, given how wound up she was from the events that had transpired earlier. Some primal force inside her sprang up, screaming to her, telling her she wanted this more than anything else in the world. "Oh..."

"Do you want it, sister? Do you need it?"

"I... I don't..." She blushed as another tentacle rolled in underneath her belly and began rubbing at her teat.

"Well?"

"Will it be gentle?"

Luna smiled deviously. "Relatively speaking..."

Celestia stifled her fear, and swallowed hard. "Then... I'm ready. Take me."

Not even a second passed after the words left Celestia's mouth before she felt a small, smooth tentacle slip between her vaginal lips, stroking, probing, twisting... She pushed back against it ravenously, wanting to feel more of it, and inside her it increased in size and solidified in shape, slowly stretching her. It withdrew, growing ever larger with each passing second, and pressed itself back into her, hilting itself firmly. She shuddered as it pressed against her uterus, filling her with sensations that were almost like new— memories of the same feelings existing as only shadows in the deepest reaches of her mind.

The tentacle began withdrawing, and Celestia tried following it with her hips, backing up, but she couldn't keep pace. She didn't need to wait long, though, before a vigorous thrust lodged the foreign member deep inside her again, forcing her internal organs to yield and rearrange themselves to make room. With a yelp, Celestia fell forward and caught herself on a knuckle and an elbow, her back legs still taught and extended.

"Luna—" Celestia began, panting heavily, "I— I want to take—" She let forth a guttural groan as the creature continued to probe her forcefully. "A— a break... It's too—" She squealed. "Too rough..."

"Sister," Luna replied, amused, "Think about what you are— Think about the abuse your body can take. Can you truly tell me you've never exploited that? There's so much to experience... What is pleasure without pain?"

Luna hovered up above Celestia, still supported by a cradle of fleshy rods. "Besides, I think you're enjoying this more than you let on," she remarked, stroking Celestia's erect wings with her hooves.

"Guh!" Celestia uttered unintelligibly, as she glanced back at her wings, embarrassed. She tried balancing on one front hoof while using the other to pull her wing against herself, but another thrust of the tentacle knocked her off-balance. She brought her hooves up to protect her face and shut her eyes, but instead of hitting the floor, she found herself gently caught in a net of tentacles.

She laid there in shock for a moment before commenting, "it— it caught me..."

Luna was still hanging above her, and Celestia was gently rotated so that they were face-to-face, belly-to-belly. "He caught you. And of course he did. He's a perfect gentlecolt, only here to give you what you want..."

"He?" Celestia asked, before getting caught up in pleasure again, the tentacles grinding away inside of her.

"A pony who loved giving pleasure to mares so much... He gave his mortal life to become something else... We go way back..."

"That's against the— Umph... It's a contravention of the— the Merlin Ordinance..."

"Oh, he's from long before that... Not that it should matter; even Merlin shouldn't have the right to tell a pony what he can do with his soul."

"But—" Celestia began to protest, before she was interrupted by Luna's lips wrapping around her clitoris. "Lu—lu—lu..."

Celestia flopped backwards, limp in the cradling tentacles, as she gave in to the experience, letting it progress as it would. The tentacles wrapped her firm wings, slipping between her feathers, squeezing and massaging her tense flight-muscles.

"It must be even worse than I thought, Tia," Luna commented, as she orbited Celestia. "You let your wings go stiff... You used to be able to control that." Luna kissed Celestia on the base of her horn. "It's not just that you haven't been having sex, is it?"

"NNnnh..." Celestia replied, unable to formulate a proper response.

"You've gone completely sexually infirm in Our absence... You've not even thought about sex, have you?"

"I—" She gasped and clenched her eyes.

"No wonder you've become so bitter... We are so glad you have permitted Us to help you..." Luna slipped down and sniffed and nuzzled at Celestia's neck.

By this point, the tentacle inside her had seemingly reached its full size, but it kept pushing harder, as though it was trying to find a deeper crevice to settle into, as though it was waiting for another space to open up and make room for it. As it pushed harder with each stroke, it started to bundle up and coil at the opening, stretching her ever wider, forcing itself to fit.

"LULU! I— Help me!"

"There is no need to be scared," Luna replied, stopping to plant a few kisses on Celestia's neck. "Nothing bad can come of this. You cannot die, you cannot be maimed... This is life— feel it— experience it! Live!"

"LUUUUULUUUU!" Celestia squealed as the creature stretched her even wider, and she felt her flesh very nearly being torn as the mass began coiling up inside her, easily doubling its apparent thickness. It pulled out, granting her a moment of reprieve, before jamming itself inside her again, forcing her open, and stopping there. She moaned, hanging on the verge of tears.

"Do you love it, Tia?" Luna whispered into her ear.

"Nnnngh..." Celestia replied, covering her face with her hooves.

"You don't want this to end, do you?"

Celestia peeked out from under her hoof, her eyes expressing a very shameful, but unmistakable, 'no'.

"Dos't thou want more?"

Celestia tilted her head down slightly, wincing. She hated herself for it, but she wanted more, and she needed more.

"Tell Us how badly you want it..."

"I need it..."

"Tell Us you're a dirty little harlot..."

"I..."

"You must say it!"

"Im a... a dirty..." Celestia slouched and looked down. "...slut..."

"Then take it like the degenerate whore you are!" Luna yelled with an excited smile, as the tentacles wrapped around Celestia's forehooves and pulled them away from her face, drawing her into an upright position. A huge blue cock moved up to meet her face, and she prepared for it to plunge itself into her throat, but it never did. It simply paused. Ready. Waiting. Rock-hard. Intimidating.

"Go on... suck it. Suck it like the little slut you are," Luna demanded, wrapping her hooves around Celestia's head and pushing her forward so that her lips touched the flared tip.

Celestia whimpered. This feeling of powerlessness; of not being in control; it was so foreign to her. She was, for the first time in so long, vulnerable.

Unsure how to proceed, extremely aware of a nagging pain between her legs, and so very out of practice, she extended her tongue to meet the tip, the very opening of the urethra, and she was met with an ample serving of pre-cum. It tasted salty and a bitter, just like any stallion might— Celestia did remember enough to know that— though there might have been a subtle hint of blueberry.

To Luna's surprise, Celestia pushed herself forward, out of her grip. The flare just barely fit into her fully opened mouth, and as she slowly continued, yet more of the voluminous secretions were pumped into her mouth, allowing the massive member to glide effortlessly along her tongue, and just barely squeeze its girth under her palette, before it found its home just tickling the back of her throat.

The tentacle continued pouring its lubricating gel into Celestia's mouth, and she had no choice but to chug it down if she wanted to keep breathing. Not that she needed to breath to live, but breathing was an all-around pleasant experience that she wanted to continue. The liquid persisted in thin layers on the surfaces of her throat, not content to slide into her stomach. She felt a force build on the back of her head, the product of Luna's impatience, no doubt, but she couldn't say 'no.' Celestia couldn't say anything. She pushed back against Luna's hooves, but she found herself losing the fight, both physically and mentally. She had no reason to contest this, and no real desire to either. She let Luna push her forward, until the phallus was pressed against the back of her throat.

Her eyes watered and her face reddened as she fought the urge to cough, and her whole body shook as her gag reflex attempted to force the foreign body from her throat, but the cock remained unyielding, Luna's force persistent, and her own creeping desires irresistible, as she found it pressing ever deeper into her throat. In all her years, she'd never let a stallion this deep inside her mouth— she'd never thought she'd wanted it. She never would have guessed she might have enjoyed it. And yet, here she was, feeling every single millimeter of it as it pushed in, feeling the little ring of excess flesh around the middle passing through her lips and teeth, it's warm bulk filling her up and stretching her apart, as it pumped its hot secretions inside of her. To her great surprise, she was loving every second of it.

Soon she was so relaxed that her body didn't even fight as the creature squeezed itself through the tight loop of muscle at the top of her stomach and took up residence therein, giving her an intense feeling of satiety, a pleasant fullness like that experienced after an extensive holiday dinner. She felt her abdomen begin to bulge out as the fluids kept being pumped into her, but she hardly minded. Her tired, satisfied eyes looked thankfully at Luna, who was hovering above her so gracefully, slowly lowering.

After a moment, the princesses' bellies touched, and the tentacles supporting Luna relieved themselves of her weight, allowing her to lay on top of Celestia. She kissed Celestia's cheeks before running her tongue up the length of the tentacle that was firmly planted inside her face, prompting it to shudder and twist. Through her nose, Celestia managed to make a few grunts, signifying a combination of pleasure, excitement, and discomfort.

"It's so glorious, isn't it, sister? I can't imagine how this must be for you, having forgone these sensations for so long." She remarked as she propped herself up so that her knee was aligned with the top of Celestia's vulva, and she pressed in, rubbing along the length and digging her kneecap into her sister's clitoris. In response, Celestia's back arched, pressing her muzzle even more firmly against the tentacle, forcing the mass slightly deeper into her gullet.

Luna giggled as she watched Celestia squirm in response to the change, trying to find comfort again in this sea of confusing and unfamiliar sensations. She wrapped her own neck around her sister's and nibbled at her ear before whispering, "now, my most faithful slut... There's only one more lesson to be learned."

Celestia glanced around for a moment, trying to figure out what Luna had meant. Suddenly, her eyes bulged out of her head as the meaning became extremely apparent. A very thin tentacle began tickling her anus, poking and prodding at the delicate puckered ring. She moaned in protest, and kicked her hind legs, but that was all counter-productive, serving to do nothing more than increase the stimulation she was receiving from the tentacles already inside her as the third tentacle's invasive, probing, touch continued.

"Calm down, sister. Use your head. This is what it's there for... Don't fight..."

Celestia mumbled angrilly. "MMmm NNgh MmmPhMM!"

"You haven't defecated for thousands of years now... Why do you think the old ones left it in place? For decoration?"

"MMpph MM-MMMmm NNNMMM!"

"Sister, We know you long for this. We know you crave it."

"MMpph mmm mmmmmm..." Celestia replied, her eyelids drooping, as she ceased her struggling.

"Be not ashamed— None shall judge you, none shall be repulsed. This is good. This is natural..."

"Mmmmmmphmmphmmm..."

"Just relax. Let it happen. Enjoy your body as it was meant to be enjoyed..."

"MMmmph..." Celestia concluded, allowing her body to slacken in the tentacles' grip.

The monster— no, the pony— no, the gentlecolt, slowly, gently, carefully eased his way inside her, the nearly-pointed tip of the tentacle making the motion so very fluid and effortless. His warm, soothing, excretions filled her rectum quickly as she felt her flesh make way for the invading member. She felt it move in six inches, eight inches, a whole foot inside her. She was sure it would stop, but it didn't. It continued, 18 inches, 20...

She felt it snake its way around a bend in her colon, and the ensuing discomfort caused her to double over under her sister, so that the tentacle invading her mouth was nearly removed, but it still didn't stop. It kept on moving through, seeming to disregard her pleasure, forcing its way around all the corners of her large intestines, relentlessly carrying on until it just reached her small intestine and stopped there.

Celestia was in shock. She didn't know what to think. She didn't even know she was so aware of where things were in her body; it had been so long since anything had passed through that part of her digestive tract... Aside from all this, the sensation of fullness was intensifying within her. The creature had never stopped pumping its pre-cum inside her. Her abdomen bulged out slightly under the pressure, and she felt that the tentacle was expanding as well, stretching to occupy the full volume of her colon. Once it filled her completely, some parts of it continued expanding, stretching the muscular walls of her digestive tract.

Then, without warning, something started happening inside her vagina. The tentacle filling that orifice sprouted blunt spikes that began rippling and pulsing inside her, and small tendrils emerged near the opening, coiling around her clitoris and massaging all along her lips. Just as she became accustomed to that feeling, the tentacle probing her mouth began twisting and thrashing about inside her stomach. The sinuous engorged surface of the tentacle deep inside her rectum began undulating in such a way that the bulbous portions passed out of her while leaving the bulk of the tentacle in place, like an infinite string of anal beads.

Celestia was left helplessly moaning, but in a moment she noticed that Luna was moaning right along with her; the gentlecolt was pleasing both of them simultaneously. Many moments passed with the two ponies embracing each other while they continued to receive pleasure from the great creature that wrapped itself around them and wriggled about inside them. It wasn't long before the sensations coming from inside Celestia's body stopped feeling foreign, and she began experiencing them in a completely different way; they were an expression of friendship, of admiration, of love. The sensations were a gift, from Luna to her— a unique experience that the two of them shared.

This was sex. This was what she had been missing.The intimacy that can only come from vulnerability, from not being completely in charge, from being completely and totally exposed to an equal. All those years in the embrace of a changeling, a creature who would do for her only exactly what she asked, exactly what she wanted, to the letter— It wasn't sex. It wasn't real. It wasn't even really love. This was sex. This was love. It doesn't matter how bizarre or unusual the specific acts are. It's a question of who it is, and why it's done.

Celestia's thoughts dissolved and evaporated as her orgasm approached. It was such an unprecedented sensation, so intense, that she could hardly believe in that moment that experiencing it was a normal part of life. She squeezed her limbs around her sister as her pleasure climbed higher and higher, and finally screamed through her nostrils as she climaxed. As she breathed hard through her nose, the tentacle plugging her mouth slowly withdrew, but its absence hardly made any difference, as the copious amounts of fluid it had deposited inside her was pressurized to a degree that it followed the mass up her esophagus. As soon as a gap opened between her flesh and its flesh, a spurt of the hot spunk sprayed out and landed on Luna's mane. Celestia let her head fall to the side as the tentacle fully emerged, and the fluids just kept spilling out under her. It couldn't be called vomiting— her body wasn't taking a sufficiently active role in its expulsion.

Finally, the pressure was reduced to such a degree that she could hold it back, and she was able to take a good, deep, breath through her mouth. She looked up and saw Luna looking back at her, prideful and joyous.

After giving Celestia a moment to catch her breath, Luna plunged headlong into a deep kiss, and as she explored her sister's mouth with her tongue, the two were lowered from their high perch as the gentlecolt creature began dissolving away. It shrank, it withdrew from their orifices... Excessive amounts of fluids drained from their bodies, from holes they couldn't quite completely squeeze shut yet. The two of them found themselves resting on their bed, legs entangled, wings disheveled, bodies sore and aching, completely exhausted in every way, but unwilling to pull their lips apart.

There was a knock at the door, and Luna clenched her eyes in response, clearly frustrated by the disruption. She pulled away from Celestia begrudgingly, and stood up. With a graceful stretching motion, and a glow about her horn, she tidied herself up, cleared away the signs of tiredness, and swept all the tentacular excretions up into a tight ball before making them vanish. Celestia watched the performance in awe; she had always had such respect for Luna's talents, such envy for the apparent effortlessness with which Luna exerted her will upon the world around her. To think, most Equestrians thought of Luna as the jealous one...

Luna strutted towards the door casually and opened it. "Oh... Shining Armor and Cadence..." She coughed.

Celestia peeked up over her bedsheets. Cadence was dressed in a school-filly outfit, and Shining Armor was decked out, head to hoof, in latex bondage gear. Luna looked back over her shoulder to Celestia, who retreated back under the sheets, redder than a tomato.

"We see Our sister made plans with you... We shall have to reschedule. Please return at this time tomorrow." With that, she shut the door, and leapt into the bed with Celestia, tussling under the covers with her briefly. "So, a threesome today, a foursome tomorrow... We shall have to find a fifth partner in two days time."

"Is that so?" Celestia asked, amused.

"Mmhmm... We think your student would make a fine addition..."

"Twilight?" Celestia asked, taken aback.

"Do you have a better, more attractive student?"

"Oh, Twilight isn't ready for anything like that. She's only just now making friends... We'd scar the poor filly for life."

"Hmm..." Luna nodded.

"Her friend Rarity, on the other hand... I get all the right vibes from her..."

"Oh, no, no, no..."

"Hmm?"

"Rarity has such a... negative sexual energy... I'd much rather have the pink one."

"I see..." Celestia replied. "Well... Luna..."

"Yes, sister?"

"Maybe... Tomorrow, instead of a four-way..."

"Yes?"

"Do you think that maybe we could just cuddle?"

Luna pursed her lips to the side before putting on a warm smile. "Sure, Tia... But only tomorrow. Your rehabilitation is my greatest priority. We cannot put it off forever..."