Lessons of the Faithful

The first thing Celestia noticed was the smell.

She knew something was wrong the moment Twilight cracked the seal of the jar, eager to show off her latest discovery to her beloved teacher. A cloying burst of cassis and honey hit the Princess’ nostrils, saccharine and heady, coiling into her mind and methodically removing every barrier she’d set up inside herself to protect her subjects from her most destructive urges. She let out a small gasp as she realized what was happening, breathing in even more of the chemical in the process, and by then it was far too late. No pony would be able to stop what was about to happen.

Night Regent Luna had ushered Twilight into the Princess’ private chambers without a second thought, having become used to such unannounced comings and goings, and she was still chuckling at the young alicorn's delirious excitement. The two rulers had been discussing the precarious political situation with the dragons for the last hour, and they were both glad for the distraction.

They’d known that Twilight was doing research on poison joke, the dangerous herb found in the Everfree Forest that had led to so many problems in the past. When it came to psychotropic drugs, the difference between being helpful and harmful was often only a matter of degree, and the newly-ascended alicorn was convinced that she could revolutionize the mental health industry in the kingdom if she could isolate and synthesize the compound that gave poison joke its effects.

With her new control of magic via alicorn power, Twilight had finally succeeded in diluting the herb to its essential components, and her delight was obvious as she went on about how she wanted to help ponies deal with their most personal issues…but her voice soon receded into the background of Celestia’s consciousness.

Time seemed to move strangely. The Princess’ heart began to thrum within her chest, so quickly that she thought she might faint, and her body was suddenly infused with a blaze of unbearable heat, strong enough to burn a pony’s willpower to ash. The feelings were familiar to the lusty alicorn, yet ten times more potent, ten times more irresistible.

A matter of degree.

Celestia’s vision began to blur, and she fought to keep from panting as the fumes from the extract did their insidious work. If she’d been just a little less perfect, if she’d voiced a moan or stumbled, one of the others might have noticed something was wrong, but Celestia’s unearthly poise doomed her to struggle alone with the sudden maelstrom within her. And then, distracted by a question from Luna about practical applications, Twilight turned to one of the Princess’ voluminous bookcases, searching the lower shelves for a little-known tome on medical science.

Celestia swore under her breath, watching the innocent wiggling of Twilight’s cute posterior pointed right in her direction. As the young alicorn flipped through pages without a care in the world she arched her purple butt in just the right way, raising her tail and showing off her tiny, unused pussy, a little slit under her dock that had never known the touch of another. Celestia bit off a groan, imagining the tightness, the heat, the stickiness…

It only took a second. Only a moment of lost focus, of desire unshackled, then Celestia felt the heavy weight between her legs and under her barrel as her spell dissolved, and all three feet of pink Princess cock revealed their full majesty, complete with enormous jewels that tumbled within a plush sack, like a thief’s treasure.

Celestia didn’t even register Luna’s embarrassed gasp, so enraptured was she with the feel of her fat breeder in the open air. It slapped against her chest in time with her pulse, again and again, a mortal weapon tempered in a thousand fleshy forges and already splattering precome upon the royal carpet as the unsuspecting Twilight presented herself.

“Hello,” Celestia’s cock said. “It’s been too long. You should let me out to play more often. Although, I can’t complain when you so willingly present me with such…amusements.”

“I…she’s not a toy,” Celestia said, trying to make sense of everything happening to her. “She’s my Faithful Student…a good pony…what a strange mistake to make…”

“Oh, you’re right! How could I have been so blind?” Celestia’s cock had a voice both teasing and demanding, sweet as the finest mead, and just as intoxicating. “She’s been so very faithful, keeping herself pure all this time just for us. Shall we partake? Don’t keep her waiting. Give your student the lesson she’s been asking for. Balls deep.”

“Lesson. Yes. It’s time for your lesson, little pony.” Celestia took a step forward, then another, and before she realized it her nose was an inch from Twilight’s pretty pussy, inhaling all the secret scents wafting from deep inside. Twilight turned her head, looking at her mentor quizzically as she asked a question Celestia couldn’t hear.

“She’s so hungry for knowledge, that one.” Celestia’s cock whispered an insidious hymn as the Princess raised her head, blowing hot wind out of a slack mouth in her desire. “Here’s today’s lecture, then: how much stress can a virgin cunt take before being split in half? Let’s start with a practical demonstration.”

“Practical…demonstration,” Celestia repeated, rearing up in her majesty and landing with all her weight upon Twilight’s back. The new alicorn’s natural sturdiness was the only thing that kept her from crashing to the ground, and she began to struggle underneath the Princess’ barrel.

“Stay still, dear Twilight. Take your lesson.” Sometimes, the younger ponies had to be dragged kicking and screaming to the well of knowledge. Celestia would have thought that her Faithful Student was beyond such childishness, but no matter. She was the Princess, and her job was to keep her subjects on the straight and narrow. She wasn’t about to shirk her responsibilities now.

Twilight would thank her later.

Celestia pushed the head of her cock, as wide as a saucer, against that too tiny slit. It felt like forcing a fist through the eye of a needle, and Twilight’s silly thrashing and whining wasn’t making things any easier, but the Princess’ lust-infused strength was easily enough to keep her student in place as she began to apply more pressure. “Shhh, it’s okay. I know it’s hard, but not all learning is fun. I need to…you need to do this. You have to understand. Let me make you understand.”

The exquisite softness of Twilight’s little cunny against that straining flare was a lightning bolt straight to Celestia’s brain, making the older alicorn grunt with impatience as she flexed her sturdy flanks, mashing herself harder against the delicate folds. The teeny twat was putting up some serious resistance, yet Celestia could feel something start to give. With sensual elation, she spread her Faithful Student’s twitching legs further apart in a bid for more purchase.

Celestia looked down and watched, fascinated, as Twilight’s slight little hole began to stretch wider. The purple nether lips lightened into a pleasing shade of lilac in the struggle to admit the Princess’ bludgeon, while virile nuts ceaselessly pumped out gallons of pre in an attempt to soften their stubborn target. Celestia was somewhat surprised at how much force was necessary, but that was fine. Experimentation was education, after all. It was another data point they could go over in the future. The future…yes. Twilight would definitely need further tutoring on this subject. As much as necessary.

Strange noises began to invade Celestia’s consciousness…was someone calling her name? She thought she heard something like a scream, far in the distance — things were certainly lively around the castle, weren’t they? She smiled warmly, basking in the glow of her subjects’ happiness as her fat prick broke open the pony beneath her. She’d never felt more secure about the future of her kingdom, especially with such a talented new Princess waiting in the wings. But Twilight obviously had much to learn before she could rule. How could she run a country if she couldn’t even take cock properly?

Slowly, gradually, Celestia forced the head of her fat tool into the crushing ring of Twilight’s cunt, and she felt a wild spasm as the first few inches met the barrier of her student’s virginity. The Princess hissed in the beautiful agony, and she struggled to maintain professional decorum, astonished at how much sheer pleasure she was already receiving. Her imagination went wild as she thought of how much better it would feel to bury her whole bone deep within Twilight’s body. Solely in the interest of scholarship, of course.

“It’s sooo fucking gooood,” Celestia’s cock moaned, foregoing all pretense as it reveled in the sensations of Twilight’s clasping pussy. “So good, it’s burning you up inside. But. It’s. Not. Enough. This is an important lesson, one you can’t leave half taught. Now, there’s a tough problem in the way, and the poor thing’s having some trouble. Help her solve it.”

“You’re being…difficult,” Celestia muttered, planting her feet and pushing herself steadily against Twilight’s fragile membrane, causing the pony’s frantic squirming to intensify. “You’ve figured out much harder problems than this before, haven’t you? Here, let’s work it out together. It’s a very simple question, really.”

Celestia bit her lip hard in a perverse kind of sympathy as she felt the first tearing of that barricade under her assault. “Fuck…how does my cock taste, little pony? Is it hot? Is it hard? Does it hurt? You have to speak up. Answer the question, Faithful Student. Solve for x, where x is my dick. Answer the fucking question, Twilight.”

“I don’t think she’s listening,” Celestia’s cock said as it bathed itself within Twilight’s virginal channel. “She’s distracted. See how she’s fighting you, trying to focus on anything except your lesson? What a naughty pony.”

“She’s certainly a handful,” Celestia agreed. She gripped Twilight’s pert tush with both hooves and spread the cheeks open, admiring the destruction of her student’s cunt as it grudgingly yielded to the Princess’ thick shaft. She noticed the poofy ring below Twilight’s tail, pulsing and trembling in distress, and she let a gobbet of spit fall into the dark hole, a slimy precursor to the gaping wreckage her cock would soon make of the young pony’s unspoiled pucker.

That was an advanced lesson, of course, but Celestia thought she could be talked into adjusting the curriculum if Twilight did well here. She had every confidence in her student’s abilities.

Perhaps sensing Celestia’s intentions, Twilight’s pussy convulsed around the invader, trying desperately to refute the Princess’ teachings. Celestia yelped as she fought against the rippling waves pushing her in the wrong direction, even as they threatened to milk her oversized prick into an early dismissal.

“Ooh, she’s…mmm…feisty.” Celestia’s cock moaned as it enjoyed the impromptu massage. “Must be one of those nerds who…always has to prove they know more than the teacher. You need to nip that attitude right…in…the…bud. It’s for her own good. Do it. Do. It.”

“This is for your own good, little filly.” Celestia braced herself, holding Twilight by the neck and keeping her face down and ass up in preparation for what had to be done. “You can’t run from this. I won’t let you. Take it like a good p-pony.”

Then she bore down hard, using all the royal power at her disposal to tear Twilight’s hymen to ribbons, obeying the desperate urge to hilt herself fully inside the too small interior. The ring of her student’s cervix gripped the tip of her breeder like a second pussy, but she went further, much further, spearing the back of Twilight’s womb and causing the imprint of the wide flare to make itself visible in that stretched-out belly.

“F-fuck!”

“Take it all!”

“Dance on it, pretty filly!”

“Work that cunt!”

Celestia and her cock sang a shattering chorus as they both reacted to the sudden total immersion. Not a centimeter of flesh remained outside Twilight’s accepting twat, making the young alicorn look like a twitching purple jizz sock stretched around Celestia’s prick, but the silky pressure of those insides only drove the Princess into a rutting frenzy as she pulled herself halfway free, then slammed back in, over and over, finally fucking that teasing little cunny that had always tempted her from afar.

“Good pony. Gooood pony. I’m so proud of you. You’re so smart! Fuck…oh, my Faithful Student…why aren’t the other Elements this dedicated? Maybe they need some remedial homework. I’ll set up a group study session, so I can do their little cunts one by one while you take notes. What a wonderful idea…fuck…s-so good…so f-fucking deep…”

Celestia gave herself up to the rhythm, and the slap-slap-slap sound of her hips against Twilight’s reddened ass echoed loudly in the Princess’ chambers. A distant part of her awareness noticed that the cock sock beneath her was no longer struggling, but she had not the capacity nor the inclination to consider what this meant. The dam within had been breached, and the raging river could only flow in one direction.

The Sun Princess had lived a long life. She’d had sexual partners beyond count, of every orientation imaginable, and had indulged in kinks that would certainly scandalize her sheltered subjects, although ponies with a broader view of royal behavior throughout history might not have been quite as shocked. But the unquenchable flame now roaring within her loins was something she had never before experienced, a devilish goad that destroyed every want, every need, except for the drive for procreation and dominance that was her sovereign right.

The Princess rubbed her cheek against Twilight’s as she claimed the pony’s womb, and she buried her face in her student’s pretty mane, now somewhat frizzy from their exertions. Celestia breathed in deeply, enjoying the clean scent of herbal soap against the musky background of cock and cunt. She realized it was the same soap that the young pony’s recently wed foal-sitter, Cadance used — having had the pleasure of making a direct comparison — and for a moment, Celestia imagined a different alicorn wrapped around her fat prick, taking a railing she’d never be able to get from her poor husband.

Celestia was primae noctis personified, after all, for this and all the nights to come, and she chuckled good-naturedly as she loomed over Twilight, slam-fucking her into the plush carpet while thinking of what might have happened had she demanded her conjugal droit.

“I should have been at their honeymoon,” Celestia whispered into Twilight’s twitching ear, her mind racing with the fantasy. “You’re never too old to learn, is what I’ve always said. I mean, Shining Armor has the experience of a teenager, and Cadance is the Princess of Love, not the Princess of Fucking. I’m sure I could teach them both a few new tricks.” She laughed again. “Now, there’s a nice idea for a new title. I should issue the proclamation tomorrow. May as well stick with what I know.”

Celestia gave her student a teasing lick just inside her ear lobe, and she thrilled at the resulting tremble. “How about you, pretty Princess? Are you feeling the magic yet? Or maybe you’d like to switch, too?”

“Princess of Come Disposal has a nice ring to it,” Celestia’s cock suggested as it gaped Twilight’s cervix. “Give it some thought.” Celestia nodded, already anticipating the coronation activities.

The Sun Princess felt a touch of wetness on Twilight’s snout as she nuzzled her Faithful Student, and she frowned, suddenly concerned. Was there something wrong, or was she just tired? It had certainly been a long day full of excitement for the brilliant young alicorn, and it wouldn’t be the first time she’d become emotional due to overstimulation. They’d need to have a talk about work habits one of these days. Being productive was fine, as long as it didn’t affect your mental health.

Maybe they could put their heads together and think of something that might help. Celestia recalled that Twilight was working on a project that seemed promising. She’d have to ask her about it later.

Right now, there was a more pressing matter to attend to.

Celestia groaned as she sensed the familiar tingle in her balls. She was close, so close. Her thick buttocks flexed and clapped as she picked up the pace, thrusting into that silky, creamy pussy with complete abandon, never wanting the pleasure to end and at the same time reaching for the ultimate ecstasy that she so often had to deny herself. They were facing the balcony, closed against the seasonal chill, and the Princess gazed through the glass of the stylish Prench doors at the glory of her realm, gleaming in the afternoon sun. Her heart swelled with pride at the sight. So did her cock.

“Look at that,” Celestia said as she pounded away, raising Twilight’s head with a hoof so she could share in the view. “There’s no place I’d rather be than here, in this wonderful kingdom, with you. I do hope you feel the same.”

Twilight was so overcome that she didn’t respond. Celestia was touched by her student’s quiet awe, though the squishing sound of her cock reaming the young pony out wasn’t exactly conductive to the mood. Still, at least she knew when to stay silent and just enjoy something beautiful. She wasn’t like Luna, who tended to wax lyrical at such times. The Night Regent could learn much from Twilight about letting a moment breathe.

Where was Luna, anyway? Wasn’t she here a moment ago?

Before Celestia could ponder this, she suddenly felt a burst of magic, sharp and strong. Twilight’s stubby horn began to glow with incandescent light, throwing shadows across the room and making the Princess squint her eyes from the glare.

“Oh, Twilight, you cheeky little filly,” Celestia said as her vision recovered. “I’ve never seen you try so hard to get out of doing classwork. Goodness…we both know you have your own interests, but if you’d put such efforts toward your studies, we’d have been done by now.”

She licked her own muzzle with a long pink tongue, letting drops of spittle wet Twilight’s mane. “Also…you seem to have forgotten one of our earliest lessons. You see, when channeling magic, the horn becomes extremely sensitive to stimuli. One must stay on guard at all times for any attempts to physically disrupt a spell in progress. This is especially important when one is being fucked by one’s foe. Allow me to demonstrate.”

Celestia unrolled her tongue in full. It was disturbingly lengthy, and it twitched with musculature that was strong enough to drive home a railroad spike, yet sensitive enough to make a pony forget their own name. The dripping anaconda coiled around Twilight’s gleaming horn, obscuring the light of the young alicorn’s spell right before Celestia opened her mouth wide to take the entirety of the shaft into her gluttonous maw.

The Princess immediately felt the surge of magic sputter and fade, like a circuit breaker tripping under a heavy load, and she smiled around her mouthful of ivory. There really was nothing like experiencing something directly to get a full measure of its effect, and now that Twilight had felt the disorientation of a magical interruption, Celestia was sure she’d never forget it.

Still, the Princess drove the lesson home, giving a sloppy horn job with as much wetness and suction as she could deliver as her hips worked her fat cock to satisfaction. Cadance had been bigger, filling Celestia’s throat with a length that put Twilight’s to shame, but the younger alicorn had a pleasing thickness that gave plenty of surface area to work with. Celestia bobbed her head up and down in a frenzy, releasing whorish moans as she devoured her prey, even adding the occasional corkscrew motion to truly rock her Faithful Student’s world.

For trying to keep Celestia from busting her nut, Twilight would be punished severely. And she would enjoy every second, whether she wanted to or not. The Princess made a mental note to have Luna clear her schedule for the next few days, as soon as she could find the silly pony.

As it turned out, however, Twilight was not the only one neglectful of past lessons. In her insatiable lust, Celestia herself had forgotten an important corollary: a being of sufficient magical strength can help recover a disrupted spell, using their own power to fill in the gaps. The Sun Princess contained so much mystical energy that even her saliva was infused with pure magic, and now it was acting like a fuse, bridging the short circuit and allowing a version of Twilight’s spell to complete — much weaker than intended, but effective enough.

Lost in her pleasure, Celestia did not immediately realize her mistake. Her cock sensed something amiss, though, and the leviathan writhed inside Twilight’s blown-out womb, unwilling to sink back into the Jungian depths until its hunger had been sated in full. But it had gorged itself too quickly, too thoroughly, and it no longer had the will to fight off the young alicorn’s desperate incantation.

No matter. Celestia’s cock sighed, thankful for the meal, and already looking forward to the next. “I would have loved to stay a little longer, but…mmm…I think it’s time to give you two sweethearts some privacy. I’m sure I’ll see you both again soon. Very soon. This one has lots of friends, after all.”

Celestia’s cock yawned as Twilight’s spell took hold at last. “Never forget what you are, Tia of the Dawn,” it said as it returned to its instinctive place within the Princess’ id. “She won’t.”

The invocation of her oldest name was a shock of cold water, and Celestia choked as if coming up for air at last, gagging like a maiden on the unexpected length in her mouth. She gingerly raised her head, feeling the ridges of the horn against her serpentine tongue as the lavender hardness slipped from her lips, leaving strings of spittle in its wake.

Celestia coughed, blinking tired eyes that had not been so bleary a minute ago, from her own reckoning. She saw that the sun was much lower in the sky than she expected — almost time for Luna to do her job, in fact — and her brow furrowed in confusion as she tried to recall what she had been doing. She had been talking with her sister about…the dragons, yes, and then Twilight had interrupted them for…something…but why was her head throbbing? And what was that annoying slapping sound?

“Princess?”

It was like the cry of a mewling kitten, familiar, but…broken, somehow, and it turned Celestia’s blood to jagged ice. Slowly, fearfully, she looked down, and the distorted face that stared back up at her was-

“No.”

In an explosion of awareness, the events of the afternoon stormed back into Celestia’s memory, including the introduction of the poison joke extract that had started it all. She could do nothing but accept the obscene images flashing into her mind, her horror increasing second by second until she wanted to scoop out her own brain, so desperate was she to avoid the obvious truth.

“Oh, no. What have I…oh, no, no, no-”

Celestia was suddenly aware of the wild thrusting motions of her own crotch in the present moment. She could feel the crushing tightness around her fat cock, and the raunchy smells of sex that permeated the air in the closed chamber made her gag. There was an unpleasant, squishy sensation under her rear hooves, and she stared between her legs at her precious carpets, now soaked through with bodily fluids. They would never be the same again.

“-please, no, no, no, no-“

Even as she moaned her pleading denials, the familiar rumbling in her balls grew stronger. She was…she was about to…

“-no, my Faithful Student…my dear Twilight…what am I doing? What have I done?”

It had all been for nothing. The years of personal sacrifice, of self-discipline that would put any warrior to shame, of carefully cultivating her environment and her friendships to minimize temptation…all of it was blown to dust, as fine as the particulates of extract that she could still sense in the air, with faint notes of cassis and honey giving off a darkly decadent aroma.

Celestia and Twilight had both been undone by a single mistake. A simple misjudgment that, if one played back the events of the day, might not happen 99 out of 100 times. Celestia had always been the kind of pony to take all the blame upon herself, and now her panicked mind ranged afield, scrambling for answers that did not exist. If she’d been more involved in her student’s research…if she’d insisted on a more secure container…if she’d reacted faster to those first stirrings of lust…if she hadn’t instructed her sister to allow Twilight into her chambers without question…

“Of course!” Celestia cried, grasping the slim thread of hope as her cock thickened and her nuts contracted, heralding the inevitable end. “This is a dream. It must be. This is a terrible joke, Luna, even for you. Now, wake me up. Luna. Luna. Stop fucking around. Please let this be a dream. Luna, help me! I’m destroying something beautiful! Wake me up! Lulu, help me, pleeeeease!”

Her head whirled as she scanned the room, desperately trying to locate her sister as she held back the oncoming flood with every ounce of determination she still possessed. She had to be close by…she had to be…there! She was near the chamber door, but what was she doing? It almost looked like-

Celestia’s moan of pain threatened to shake the entire castle to its foundations, but nobody outside her chambers heard it. Now that lucidity had returned, the Princess could easily feel the contours of the silencing spell that had been placed around the room, allowing the disaster to continue uninterrupted. She also detected the telltale magical signature of the caster, as familiar to her as her own.

Luna was on her back, her head leaned against the door, almost bent double with her hooves raised to her ears. Her deep violet pussy and asshole were on full spread display, and she had a hoof in each, working both holes in frantic masturbation while her hips jerked mindlessly. Frothy cunt cream ran down one thrusting arm and into the dark rear orifice beneath, lubricating it for a rough pounding as she gouged herself out, writhing like a living sacrifice in her sister’s flames.

“Destroy her,” the Night Regent hissed in a chilling voice that Celestia had hoped never to hear again. “Consume her. The sowing has taken so long…but now is the time for reaping. Take what is yours, Tia. She belongs to you. All of them do. Burn the kingdom to the ground, dear sister, and fuck them on the ashes.” She groaned, and a jet of come squirted from her twitching cunt as she orgasmed endlessly. “And then…and then, Tia…fuck me.”

The light went out of Celestia’s eyes.

There was a power that was stronger than magic. Stronger than the relationship between teacher and student, more enduring than the bonds of sisterhood and friendship, and more potent than the most insidious drug. As Celestia stared at Luna with a dull expression, watching her get herself off to Twilight’s destruction while in the throes of poison joke ecstasy, a corner of her awareness knew that if not for the extract, there would have been some other catalyst. She would never find respite from her carnal urges, not as long as she lived. She knew this as surely as she knew the path of the sun across the sky.

Celestia stopped fighting. The first jet of scalding come swirled through the channel of her treacherous cock, and she let it happen, resigning herself as that ultimate tidal wave of pleasure crashed over her. She succumbed completely, groaning in bliss with slack lips as she held herself deep inside Twilight’s ruined cunt, letting the sensations carry her out of her body and up into the sky…far, far away from the kingdom she cared for and the ponies she loved.

In that moment, Celestia lived for nothing but pleasure, wallowing in her own weakness as she came harder than she had ever come in her useless life. And as she dumped her load into her Faithful Student, feeling the backsplash of sperm from her titanic spending against her snow-white thighs, the Sun Princess understood one thing with perfect clarity.

She could not live without this. Celestia needed to fuck and dominate like others needed food and oxygen. She was a slave who loved her chains, even as they bit into her flesh. She would lie, she would dissemble, she would inflict wounds and she would take them upon herself if it meant she could forget, just for a while, how much of a failure she had become…had always been.

Celestia was an addict. A come slurping, womb pillaging Princess of Disgrace, who didn’t even have the courage to end it all so she could at least spare her poor subjects from the consequences of her all-encompassing greed.

Celestia’s thick cock, immersed in her own come within Twilight’s body, was abruptly rocked by a series of contractions. The older alicorn closed her eyes, nodding in sympathy as the rhythmic motions flowed around her prick, pumping every drop of cream out of her exhausted balls.

Twilight had given up, too. “It’s all right,” Celestia whispered as her student’s weeping mixed with the splattering of their combined spendings. “Go ahead. Let it out. I’ve stolen everything from you, so at least take what pleasure you can.” She squeezed her eyes shut tighter, angry at herself for the tears she had no right to shed flowing down her muzzle. “Never forgive me.”

They were two dead things rotting from the inside out, yet they clung to one another as they gave themselves over to the void.

Behind her closed lids, Celestia sensed a strange brightness. She blearily opened her eyes again, and through the watery haze, she saw that Twilight’s horn was once again glowing. But it flickered strangely, and the shape of the magic was like nothing Celestia had ever seen before. The complexity took her breath away, even in the midst of her horrifying situation; it was like a spell within a spell, within a spell, twisting and intersecting in ways that defied logic. For any other alicorn, it would be like trying to write three different messages in three different languages, at the same time, backwards, all within the space of a normal letter. And not even Celestia could decipher its effect.

She had a good idea of what it might, be, though, and the Princess smiled grimly, not bothering to try and stop the casting. She could, easily — the more powerful the spell, the easier it was to disrupt, and this one would take only the gentlest touch — but she had not the right, nor the will to do so. Whatever Twilight was planning, Celestia only hoped it would slake her thirst for revenge.

“Despite everything, I’m glad it’s you,” Celestia sighed as the light from the young alicorn’s horn cast a beacon, guiding her way home. “I shall always love you, Faithful…no, Princess of Magic. Now, make it hurt. Burn me to carbon, and forget my existence. Let me take all of your hatred, and if you should live, then be the ruler that I could not. Please.”

The blinding flash of the spells’s firing overpowered Celestia’s senses, yet she stared unblinking into that magical brilliance until her consciousness faded.