"Now Twilight, keep your stance wide, and keep your body lowered." Celestia murmured to the filly, letting her voice echo off the dusty walls of the massive-yet-empty royal library. She steadied her struggling apprentice with a long, swanlike wing, then slowly backed away, readying her magic with a pale yellow aura for dire circumstances. The confines of the library were perfect for practicing the spell. The catacombs were blast-proof, so anything that went wrong wouldn't even need to be repaired. And the place was usually empty, so nopony could find out their beloved queen and monarch of the country they lived in was practicing magic with a filly.
In the world of Equestria, magic had somehow taken over the minds most of the magic users-in-training and their mentors during certain spells. Nopony wanted anypony they knew, especially somepony like the ruler of their country, to begin training a pony of any gender and age how to use magnificent spells due to this. Yet Celestia had found she could not ignore this young filly when she found her sitting on the porch in the rain, attempting to create an umbrella out of her week magenta aura yet failing drastically. Her mind was pulled back into reality by that same foal's words now.
"L-like this?" Twilight asked, poised gracefully with her head craned over an old stone tome. The white alicorn smiled warmly at her student. How far she had come.
"Yes, perfect. Now, slowly activate your aura... don't put too much stress on anything." The alicorn murmured kindly, steadying the shaking back of the purple foal with a wing again.
Twilight knew that was almost impossible to do. The stance was hard to maintain, nearly impossible to balance in. She shifted some extra weight to her stronger front legs, taking little notice of how they began to shake. With a bit of strain, she managed to fizzle a small, magenta aura from the tip of her horn. Twilight sucked in a breath, then looked to Celestia for the next step.
"What do I tell you to do every time after you activate your aura?" The princess felt there was no better time to quiz the young unicorn-in-training then now. She let her eyes drift slowly along Twilight's back to her tail, which was off to the side and exposing the soft lips of her pussy.
She's already on her first heat. The monarch thought, returning her gaze to Twilight's horn.
The room darkened dramatically, Twilight heaving herself back to a straight-back position with another huff. She tried to loosen, only to find herself almost collapse. She sucked in a breath of sweet air, stiffening and adding weight to her shaking front legs again. She slowly read the tome. "Fi uoy yllautca deirt ot daer siht sdrawkcab, u bmud fa!" Cried the filly jerkily, straight visible in her voice as she squeezed her eyes shut and prayed for it to work. She felt power surge through her veins, and come out her horn quickly. Her aura tripled in size. "kcuf em!" She screeched, though she did not wish to say it at all. She repeated it several times, draining the library of all it's light.
Celestia watched as Twilight's tail lifted high, high up into the sky, revealing the wet lips of her ready pussy again. This time, however, Celestia felt a wave of emotion come over her, wheeling her to the ground. A surge of yellow aura blasted from her horn, connecting in the middle with a ray that flew from the purple filly's horn.
Is this Monochrombia? Celestia thought in a panic, referring to the disease-like condition mentors and apprentices were getting across the globe. She searched for a way to end the spell, eying around for anypony who could have fiddled with it somehow. When she found nothing, she squirmed and kicked for freedom. Somepony, he-!
Blinding light filled her mind's eye, seeming to wipe out everything she knew except for two things: one word, want, and everything she knew about Twilight and herself. Her real eyes turned to full white, and slowly everything faded to black. The lights flickered back on again dimly, and Celestia regained herself- but not as before.
Twilight, on the other hand, felt exactly the same. She looked over to her dazed mentor in a panic, darting over with worry. "Celestia!" She cried, jumping back as the alicorn's eyes snapped open. Fangs grew from the mare's teeth, and a whip spawned in the air out of her yellow aura.
"Come over here, you brat..." Celestia said, eyes turning to small, black slits.
"W-what!? Hold on Celestia, I'll get somepony!" Twilight yelped, turning to run but finding a sharp pain in her flank. She gave a small cry, falling to the ground to try and tend to the stinging wound.
"I'll give you all you could ever dream of, little girl!" The monarch said, smiling. She jumped atop Twilight, finding she was so big she had to put her front hooves on the railing of the balcony.
Twilight screamed as the massive cock the same size as her teenage brother's leg entered her small pussy. It hit her womb almost immediately, continuing deeper into her nether regions. The massive cock seemed to almost vibrate, dribbling with precum from within the steaming pink land of tissue. The foal screamed, tears welling up in her eyes, as Celestia bore down until she was all the way in, her balls resting upon the filly's ass, which was now lifted up into the air.
Celestia looked down devilishly at her, a smirk upon her face as she thrust once, her balls that were the same size as Twilight's head, possibly even bigger, slapping against the filly's small purple ass loudly. She thrust again, erecting blood-curdling, gut-wrenching screams of pain from the young filly. Celestia lay herself down upon the filly, her dick pressing against the warm insides of Twilight's pussy violently. Her balls brushed arousingly against her disturbed lips, and Celestia grinned wildly as Twilight let out a shrill moan that filled the dim room.
Celestia began to thrust many more times, at first slow and shallow for the filly's sake. Gradually, she began to run faster and faster, her giant pussy opening up to the world in all of it's pink glory, spurting out small pieces of clear precum itself as she rutted her student unmercifully. She gripped the filly's ear tightly, grunting in pleasure as her heavy balls began slapping in a rhythmic yet rapid way, filling the squirming filly with joy.
"Oh, yes! C-celestia, please! Continue!" The foal could no longer hold back her mind's urges, letting out more squeals of joy. "Empty my pussy!" Her horn sparkled, releasing a small burst of magic as she let her tongue loll out her mouth. Her aura sparkled to life shortly after, and she pressed a magenta cock deep into Celestia's own pussy, making the alicorn also cry out in delight.
"I-I'll rut you until you can't feel your damned l-legs!" Cried the mare, her dick flying into the filly as the magic dick also worked it's magic within her enormous entrance. She vigorously was now almost shoving her balls into the happily squirming filly, hissing profanity at her student. Twilight suddenly cried out loudly in pleasure, releasing her cumshot all over Celestia's dick.
Celestia herself could not help but cum all over the slowly fading magical dick her student had put up like a work of art for her. "Your not done yet, wake up you little shithead!" She spat, biting down on Twilight's ear and surging deep into the small foal's nether-region. Twilight cried, this time in agony, as the tip of the dick reached halfway into her womb, then released it's own creamy ocean of white into the chamber. Small extra spurts came from the tip as it retracted out of the pussy. Celestia, panting and her cock still letting out gradually smaller squirts of cum along the carpet, made a small blindfold out of her aura, wrapping it around the filly's eyes quickly.
Twilight began to panic, but only for a small amount of time as she suddenly felt the tip of Celestia's cock rubbing against her asshole. She moaned- though she didn't want to- as Celestia reentered her, slamming into her again until her balls stopped her.
Twilight yelled, tears dripping onto the ground around her when they could escape the dark blindfold. She wept loudly as the monarch went about her business of rutting out the filly's ass. Her hind legs spread out to different sides until she was almost doing the splits with them.
Celestia smacked her balls against Twilight's bruised pussy, then sighed as cum flooded through the small purple apprentice. The single strike of a whip bore down on the unicorn's right ear, making her wince and let out a sob of agony. "Shut the fuck up, you little brat." She hissed into the bleeding ear, spinning her apprentice around and sitting before her, her massive erection tingling.
Twilight blinked as the light of a candle filled her eyes. She briefly looked at the sight of Celestia's massive cock, noticing it was stiff as a tree trunk and as round as the princess's leg. Then the white alicorn jumped upon her, the blindfold regenerating. Twilight found the hard, dripping cock forced all the way down her throat, and began squirming as her air was fully cut off.
"Suck on it, you whore!" Snarled the Princess, her fanged mouth biting down on the injured ear again.
Twilight tried to yell, but no sound came. She gagged on the dick, suckling upon the head and lapping at the balls with what tongue she could move.
Celestia moaned. What a beautiful experience this was. Her own student sucking on her massive stallionhood, the cumshot already tingling within her hanging dark tan balls. Her breath hitched as Twilight suddenly began moving her head back and forth, the pink dick bobbing in and out of Twilight's mouth as though it were still within her pussy. She pressed down on the purple foal's still crying head, shivering and groaning as her cock pulsed with joy. "Ghhhnnn..... ah-!" Celestia felt the trembling sensation surge forth, a final surge of white cumshot spreading across the ground and inside of the foal's mouth.
Twilight weeped madly as her air finally returned to her. She took multiple heaving breaths, trying to regain stability. Celestia grunted, turning around.
"Celest...ia?" Twilight said, finding herself drowsily knocked back.
"Oh, yes?"
"I feel... tired...." The purple filly collapsed, her cum-stained bare flanks shining in the revived light. Celestia raced towards her student, feeling for a pulse and happily finding one.
"Well, Twilight, still holding up after all this? I look forward to seeing what you produce..." Celestia mumbled, picking up her apprentice and removing the carpet of the sprays of white that had placed themselves there.
She exited quickly.
Author's Note
I hope you all enjoyed. This thing got stretched out for word reasons, and also because I wanted to make it kinda like torture.
DELETED SCENES:
Twilight originally was going to perform cunnilingus on Celestia as she turned around.
Celestia originally was going to put a lock on Twilight's horn so she couldn't use magic.
Twilight originally was going to die whilst Celestia came in her throat.