Denial

Twilight Sparkle grunted, her hooves gripping the old stonework as best as they could. “I’m close!” She cried.

Celestia grinned as best as she could considering her mouth was completely occupied with the task at hoof. Her tongue flicked across the mare’s slit, lingering on her clit and giving the young unicorn’s love bud particular close attention. The alicorn could feel the ripple of pleasure travel through her student’s body, from the twitch of her tail to the tightening of her back, Celestia knew the signs well.

It wouldn't be long now, but she wasn't ready to let the mare have her first orgasm in nearly two months, she wasn't ready for that. Celestia wanted to turn her into a puddle of goo when the unicorn finally came. She wanted her student to be a gibbering mess of post-coital bliss and to do that she needed more time.

Celestia extracted her tongue from the mare’s pussy with an audible shlick. “You may not come yet.”

Twilight whimpered, her head falling as she panted in exertion. “Please make it quick princess, I can hardly feel my legs after all that running and what you did to my pussy this morning.”

The alicorn chuckled at the memory before diving right back in. Yes, she certainly had been quite cruel that morning, hadn't she?

Celestia was an expert at casting her magical dick spell, sure it had a real name but Celestia thought the rather crude language was fitting and she had decided to keep referring to the spell as such. She was so good at it that she could basically make her cock as wide, as long, or as strange as she wanted, or even create two dicks if she so chose. So when Twilight saw her mentor casting a familiar spell she merely sighed, pushed aside her chair, and assumed the position. Only to be surprised when the largest cock she had ever felt in her life suddenly rammed against her moist folds.

Fortunately, she was already wet from being forced to masturbate for an hour after waking up, Unfortunately, that meant that Celestia’s enormous new cock slipped inside her relatively easily and without giving the mare time to adapt. So when she felt Celestia’s weight settle on top of her, then felt the enormous head of her cock slip a little deeper, she froze.

Her limbs locked and her eyes stared at the sentence she had been reading. “Ow.” She whispered.

Celestia didn't seem to care and merely pushed her hips forward, forcing the enormous head of her cock deep into her student’s tight snatch. It was slow going but Twilight Sparkle’s pussy was remarkably accommodating, probably due to just how frequently Celestia had either her magical cock shoved inside her, her favorite strap-on, a toy, or just her tongue. One way or another, her student’s cunt was almost always filled with something, day or night, which left her remarkably loose.

Which didn't matter in the slightest right now, as Celestia had chosen this moment to really push the mare’s limits and test how far she could go, invalidating all the experience the mare had gathered over the years.

Twilight strained to keep reading, but found the act impossible as the massive cock ramming inside her blew away all such thoughts. The mare was a little annoyed that yet another study session had been ruined by her perpetually aroused mentor but that resistance was already beginning to melt away. Despite her faults, Celestia was nothing if not an expert lover and it took only minutes for Twilight to finally admit that she needed this.

Stress and worries began to melt away as her mentor’s hips continued to slam against her own, burying her fears amidst endless waves of pleasure. With a reluctant sigh, she pushed aside the textbook and slipped her hooves forward, getting into a more comfortable position. Celestia hummed her approval, reaching down and nipping the younger mare’s neck. “Good girl just lay back and take it.” She whispered huskily.

Twilight only grunted, not wanting to encourage her mentor any more than she had had.

Minutes passed and the mare all but melted into the desk, so filled with pleasure that she had forgotten why she was even there. The small moans and whimpers of joy were replaced by throaty rumblings of a whore enjoying a nice hard dick. Celestia chuckled to herself, loving the feeling of her student melting in her embrace, her mind having given up and allowing her body to become a slave to pleasure. It was carnal and powerful and the ancient alicorn reveled in the feeling of such control.

Orgasms rose within the mare only to be shut down by the spell, pushed to the back of her mind, and forced to be forgotten over the course of the nearly half-hour she had been rutted. Yet another orgasm was pushed down, a ragged moan slipping past Twilight’s lips as she felt another surge of pleasure disappear before it could arrive. Throughout it all Celestia remained as impassive as ever, seemingly never even coming close to an orgasm of her own.

By now Twilight’s cunt had been stretched to its limit and been forced to adapt to Celestia’s immense size, the pain having all but disappeared. Replacing such pain was a pleasure the likes of which Twilight had never experienced before. The stretching, the filling, it felt as though her entire body had been made into little more than a pussy that was to be used for Celestia’s pleasure. Submitting to the alicorn’s will had always felt natural, as if her body was predisposed to caving to the pressure but after another orgasm began to creep up and was forced away, Twilight felt resistance build.

The frustration of being forced to have each one of her orgasms removed by the spell had begun to wear on her. The fact that Celestia had suffered no such spell and was free to finish whenever she wanted was unbelievably frustrating. With a growl of annoyance, the unicorn abandoned her subservient attitude and thrust back against the alicorn.

An act that Celestia had seemingly been waiting for as she let out the first, moan since she had initially thrust deep into the mare’s body. “Mmm good.” The alicorn muttered, throwing a little more force into her next thrust.

From then on the sex became rougher by the second, with Celestia increasing her pace and forcing Twilight to stop and adjust as her body was stretched in ways she had never imagined possible. She was nothing if not tenacious though and it didn't take long for her to adapt and push back, using some of Celestia’s own techniques against her.

The alicorn laughed despite the situation, marveling at just how much her student had learned in such a short time. If Celestia ever let her go, the little mare would surely make a wonderful wife, regardless of the gender of whom she married.

With a cruel smile, she felt her orgasm begin to rise, and rather than push it down Celestia allowed it to keep coming. She wasn't going to make it easy for the mare though and she increased her tempo until her magically grown balls slapped audibly against the mare’s clit with each thrust. With a slight push and a forced shift in position, Celestia was able to hit deeper than ever before, forcing a strangled epp from the other mare.

Twilight’s face twisted into a grimace, and though a part of her was intrigued by the challenge of it all, she forced a frown onto her face. Pushing her legs wide she shifted her weight back and really threw herself into every backward thrust, matching Celestia for the effort the alicorn threw in.

Taken off guard once more by her student’s cunning, she smiled warmly and nipped the mare’s ear. “Such a slutty little mare, riding my cock like that.”

Twilight groaned, biting her lip and holding back another moan. She didn't want to give Celestia the satisfaction, though even then, a part of her knew that Celestia was no doubt enjoying the barely contained look of pleasure on her face.

Celestia did indeed enjoy the expression on her student’s face and so with one last grunt of effort, she threw her hips forward and buried herself in her student’s pussy. Twilight knew well what that meant and with a smirk, she threw her own hips back and moaned long and hard. Just as Celestia seemed ready to cum, Twilight broke out her secret weapon and clamped down on the cock inside her. The walls of her pussy rippled, milking the cock for all its worth while making her already tight hole even tighter.

Celestia's grin nearly encompassed her entire face and she couldn't help but let out a deep laugh. “You have done well my student, but be careful what you wish for…”

“What are you…” Twilight’s body suddenly went stiff and a panicked look spread across her face.

The alicorn’s already titanic cock twitched and began to flood the mare’s pussy in a single burst of cum. With each pulse, the mare’s body received another fresh wave of cum that blasted against the deepest reaches of her body. She was forced to lay there and take it as she felt yet another orgasm rise only to be washed away by the insidious spell. “Please let me cum Celestia. Please!” She cried out, her hooves scratching down the desk as she whimpered.

The alicorn chuckled and shook her head. “Not yet my student, if you succeed on your next test I will let you not only cum but I will give you the single greatest orgasm of your short life.”

Twilight barely even processed the information, so focused was she on the feeling of the alicorn’s cock twitching and pulsing inside her. The sensation was bizarre, with the unicorn actually able to feel each pulse of the alicorn’s dick as it shot load after load into her body. Her tongue lolled out of her mouth and her body became limp in the grasp of the alicorn as her back legs twitched with each pulse of Celestia’s cock.

Celestia chuckled at the sight, pulling back just enough where she could gently chew on the mare’s ear. “Did you have fun, my little cock sock? Because I sure did.”

“Whuh?” Twilight muttered.

The alicorn bent down and gently kissed the mare’s cheek. “Patience dear Twilight, now what was it that you were trying to study?”

Twilight blinked, having to give her head a hard shake before she could even form a coherent thought. “I, uh was trying to dispel the spell you placed on me?” She winced prematurely, sure that Celestia would be disappointed in her.

Only, no reprimand came and indeed, Celestia seemed entirely fixated on a book that was beneath the large tome dedicated to dispelling enchantments. It was small, ragged, and contained information on what Twilight had learned were the elements of harmony. Celestia shook her head suddenly and pulled back, her cock slipping out of Twilight’s pussy and causing a wave of cum to squirt out of her abused snatch and out onto the floor.

Twilight stifled a moan as best as she could, panic coursing through her at the sudden turn of events. “Did I do something wrong?” She asked hesitantly.

Celestia shook her head, a strangely serious expression on her face. “No, but you must go to Ponyville. The small town is where we are having the summer sun festival and I need you to-”

“But enough of that my dear, you must be tired, so allow me to help you with that,” Celestia remarked.

“Wait, wha!” Twilight yelped.

Celestia grabbed the mare in her magic, turned her over onto her back, and hefted her ass into the air, allowing her ample access to the mare’s dripping cunt. Celestia breathed deeply, inhaling the scent of a needy mare and grinning like a mad pony. The scent of her arousal was so potent, so intoxicating that the alicorn couldn't help but dive in.

Her tongue extended from her mouth, the long, dexterous appendage slipping between Twilight’s folds instantly. Instead of lowering herself down and getting a better angle, Celestia simply lifted the mare’s rump higher, allowing her tongue to slip as deep as possible into the mare’s dripping honey pot. The taste was both familiar and exotic and Celestia hummed approvingly, able to tell from taste alone that Twilight had been aroused for nearly the entire day without end.

After giving herself a mental pat on the back, Celestia continued to use every last trick she knew, making the mare melt into a puddle of pleasure in seconds. “Oooooh sweet Celestia,” Twilight muttered, her limbs becoming limp.

Her aches and pains seemed to vanish, bruises and cuts that had bothered her ever since her run through the forest suddenly dulled into nothing. The unicorn wasn't sure if this was some sort of spell or the pain was simply drowned in pleasure but either way, she didn't care. What the alicorn’s tongue did was beyond description, its every movement sent ripples of pleasure through the unicorn’s body.

Celestia’s millennia of experience was brought to bear and in that instant, Twilight understood just how little she truly knew. She was experienced, and powerful compared to her fellow ponies but to the ancient alicorn she was naught but dust on the wind. Celestia’s tongue made her feel pleasure like she had never imagined and she wasn't sure if it was seconds, minutes, or hours later but soon enough she could feel her orgasm coming, and she limply lifted her head in order to look up at the domineering alicorn.

“C-can I c-c-cum?” She asked, her head lolling about on her shoulders as if her bones had been turned to jello.

Celestia extracted her tongue with an audible shlick and gave her lips a quick lick. “You may cum as much as you want in the next thirty seconds.”

Twilight would have questioned her choice of words, but the alicorn had already dived back into her snatch, destroying the unicorn’s ability to form rational thoughts. Instantly Celestia was back at it, ushering Twilight into a world of pleasure and bringing back the orgasm that had for a second, felt fleeting.

The mare tensed slightly, most of her body unable to answer the call of her mind. Her pussy quivered and her back arched and with one last shuddering moan, she came.

“Celestia!” She cried, her back legs twitching madly as she came harder than she imagined possible.

Her entire body shook and if it wasn't for the fact that she still felt like a limp pile of jello she was fairly certain she would have flailed around like she was being electrocuted. All throughout her orgasm Celestia continued, unhindered by the mare’s quivering limbs or spasming pussy. By the time Twilight’s orgasm faded, she could already feel another coming on and she whimpered pathetically, her eyes rolling into the back of her head as she prepared for the inevitable.

The second orgasm was somehow even more powerful, to the point that even her horn began to spark. The small jet of purple electricity arced uselessly through the air, dissipating quickly and drawing a small chuckle from the ancient alicorn.

Time quickly lost all meaning to the young unicorn, her body beginning to feel strangely distant, disconnected almost. There was a distinct feeling of lag between her desire to move, and her limbs actually moving. Her every thought was consumed by pleasure and it felt as though her entire body had become little more than a pussy. Electricity coursed up her spine whenever Celestia so much as brushed across her clit, her folds aching from the constant stimulation.

The mare was only faintly aware of Celestia’s actual actions, as the carnal delight of it all seemed to overwhelm her ability to even feel anything down there. All was a pleasure, her orgasms became so close together that she could hardly tell the beginning of one and the end of another.

Then, after an eternity, everything stopped and she was lying sprawled out on her back on the cold stone floor, with only her frantic breath as any indication that she was even conscious. For several seconds she lay there, staring up at the moon through a destroyed section of roof, utterly perplexed as to where she was, what she was doing, or even who she was.

Then it all came thundering back and she stood up suddenly, her eyes going wide. “Celestia?”

The alicorn walked over to her, looking down at the mare still lying on the floor. “Yes, my student?”

“How did you do that thing with your tongue? It felt like… it felt like… heaven.” She muttered, her eyes glazing over at the mere memory of the pleasure she experienced.

Celestia threw her head back and laughed. “Oh my dear student, in time I will teach you all I know. For now, though, I believe there is somepony who wants to thank you for your help in freeing her.”

“Who? Oh, right.” Twilight shook her head, giving her cheek a slap and forcing her brain to begin working properly once more.

The mare stood on unsteady hooves, slowly working her way into a standing position only after Celestia helped her stop shaking. With a deep breath, she gave her head one last shake and looked up at Celestia. “T-thanks.” She muttered, a blush spreading across her face.

The ancient alicorn merely nodded, her trademark smirk back on her face. “No, thank you for returning my sister to me.” Celestia turned suddenly, looking over to a door across the room. “You may come out now Luna, she is ready to speak with you.”

Twilight tried to put on her biggest, hopefully, least fake smile possible.

“A-are you sure?” A small voice asked from around the corner.

Celestia chuckled warmly. “Yes, dear sister. Come on out.”

A small teal face peeked out from around the corner of the doorway and smiled awkwardly at the pair. Twilight smiled a little wider, hoping her grin looked less tacked on than it felt. In truth, she was genuinely happy to see the alicorn both unharmed and now purified but after that earth-shattering set of orgasms she just had, Twilight wasn't entirely sure her face knew how to smile anymore.

“Hey Luna, how are you feeling?” Twilight asked awkwardly.

Luna smiled, slowly trotting into the room. “G-good.” The alicorn suddenly dropped into a deep bow, her nose nearly brushing the floor. “We must thank thee from the bottom of our hearts. We have been informed that life debts are no longer ‘a thing’ as it were or else we would gladly pledge ourselves to thee.”

Twilight blinked, looking over at Celestia for support only for the alicorn to chuckle at the unicorn’s distress. “Well, would you look at the time, I better go make sure the other elements of harmony are alright? Toodles.” Celestia waved and trotted out of the room, leaving Twilight to stare awkwardly at the still-bowing alicorn.

She was much shorter than Celestia, barely taller than even Twilight and her mane, tail, and fur were an absolute mess. Which Twilight guessed made sense as it's not like there are brushes on the moon or anything. She was thin, thankfully not painfully so but still enough that Twilight couldn't help but worry that she may have been suffering a minor case of malnutrition.

The longer she looked the more she noticed was out of place, like the way her back legs quaked, as if she was struggling to stand. Or how her tail was raised completely, making Twilight wonder if she had hurt her back legs somehow and wanted to keep her tail out of her injuries. Just as she was about to ask if she was hurt, Twilight’s nose picked up a very particular, very familiar smell. It was one that she had grown used to ever since Celestia had cast that spell on her, as it clung to everything Twilight owned.

Then, it clicked.

“Uh, rise. Please.” Twilight half commanded, half muttered, a hot blush on her cheeks.

Luna stood slowly, smiling faintly, searching Twilight’s face for approval.

The unicorn smiled a little more sincerely. “I am glad you’re free from Nightmare Moon, but do you mind if I ask you a question?”

Luna blinked. “Err, of course, Twilight Sparkle.”

“Just Twilight is fine.”

“Of course, you may, Twilight.” Luna corrected.

“Right, well…” The unicorn coughed into a hoof, scratching the back of her neck awkwardly. “I was wondering if you may have had a certain spell cast on you by Celestia.”

The alicorn opened her mouth to speak, only for it to shut, and her head to cock to the side. “What spell, exactly?”

Twilight gulped. “A heat reduction spell, that makes it so you can't… you know…”

Luna blinked a few more times until her eyes suddenly went wide and a hot blush slipped onto her face. “I don't know what thee are talking about.” She rose to her full height in an attempt of intimidation, which would have worked if she wasn't still blushing hotly and fidgeting occasionally.

“Are you sure? Because it sure looks like she did and I was just wondering if-”

The alicorn stamped her hoof. “There was no such spell, and that's final.” Noticing the other mare wilting slightly, Luna looked over her shoulder, checking for any sign of her sister. With nopony in sight, she leaned forward, whispering in the other mare’s ear. “But if we did have such a spell cast upon us, it would not be something Celestia would like us to speak of. Perhaps another time?”

Twilight nodded eagerly. “Another time.”