Nomen Novissime Acutam

Many, many hours of loud and messy maregasms later…

“Feeling better now, Twilight?” Celestia coolly asked, looking over at her cum slick student.

“Mmmhmm,” the little purple alicorn hummed, sipping her Wonderbolts themed sports drink. Even though A Dash of Blue wasn’t her favorite flavor, the beverage was dearly appreciated, alleviating her lost fluids and electrolytes from her earlier torment. After having been whisked away to Celestia’s private room, she’d been subjected to countless orgasms, at the hands of her senior Princess. Eventually, the older mare had relented and cleansed her of her magical affliction.

“Now that you’ve learned your lesson, would you like to hear about Luna’s unfortunate encounter with that very same spell?” the alabaster alicorn asked, seating herself on a dry area of the bed.

Twilight simply nodded in response. Although she was physically alright, more or less, her mind was still a bit foggy. That being said, the notion that Luna, the younger of diarch and Princess of the Moon, would succumb to the same malady which had befallen herself, was intriguing. Cuddling up to her former teacher, the smaller alicorn eagerly awaited the tale.

“So,” Celestia began, looking down at her protégé, “it all began with a harmless game of hide-and-seek…”

~

Countless Centuries Ago

~

The Castle of the Two Sisters, resplendent as ever, sat in the heart of the Everfree forest. The sun shone brightly on the horizon, casting brilliant crimson light over the perfectly hewn stone of the Princesses’ fortress. For all intents and purposes, it was a day like any other. Ponies scurried about the bastion of Equestria, tending to their duties and living their lives. Sadly, all of that would change, due to one tragic mishap.

Deep below the castle, in the labyrinthine catacombs, a game was afoot. Engineered under the guise of a defensive network, countless tunnels and hidden rooms were buried beneath the fortress. Of course, the notion that they served some functional purpose was all a ruse carefully crafted by the Princesses. In truth, they were, for the most part, simply for the personal enjoyment of the sisters. The winding hallways and trap doors allowed them to play all manner of pranks on unsuspecting ponies, not to mention the endless games of hide-and-seek which they loved to engross themselves in, just like the one which was currently underway.

“Luuuuuuuuuna,” Celestia softly called, peeking her head around a corner. Peering down the corridor, lined with sets of burnished armor, she looked for any telltale signs of her sister. They’d been at it for nearly an hour, after having finished their official duties for the day. Creeping down the hallway, the snow white alicorn continued her search.

Silently, Luna waited for her sister to pass. Concealed within one of the suits of armor, she held her breath, as the larger mare trotted by. The particular ploy would only work for so long, given how rapidly she’d been growing, but it mattered little. Having given her sister a few minutes to disappear, and hoping she was well out of earshot, the midnight blue alicorn teleported herself out of her metal confines. Stealthily, she scampered in the opposite direction, seeking one of the many hideaways in the area to hide within.

Quietly fleeing from her sister, Luna slowed, as she heard unsteady hooffalls. Peering around a corner, she saw the source of the noise. Star Swirl, their trusted sorcerer, was exiting an alcove, but something seemed wrong. First of all, the stallion appeared exhausted, limping and stumbling along, as if in a trance. Secondly, his equipment, normally neatly sheathed beneath his cape, flopped about freely, slinging seed to the stone floor below. The sight was unsettling, to say the least.

Curious, and more than a little disturbed by the sight, Luna waited for the wizened stallion to make his leave. As he rounded a corner, going out of sight, she glanced at the room which he’d emerged from. Slinking towards the doorway from which Star Swirl had appeared, the young alicorn sought the source of his affliction. Gazing into the chamber, she found the area barren, save for a lone dais in the center of the alcove. Atop the small platform, sat a book of some sort. Skulking deeper, Luna paused, as her hoof nearly slipped on something sticky. Looking down, she grimaced, realizing the floor was coated in what appeared to be pints of spunk. Her interest piqued, Luna approached the lonesome tome. It’s pages, spackled with semen, were not what she’d been expecting.

Contrary to Luna’s initial suspicion that the literature was of an erotic nature, the book seemed to be a collection of spells and enchantments. If she had to guess, it was likely a compilation of Star Swirl’s works and experiments, given the fact that most of it seemed to be theoretical in nature. Most of the conjurations and hexes were completed, and a few had notes scribbled about in the margins, except for the page which had been left open. Upon its surface were but a scant few words, trailing off into a series of indecipherable markings with a gobbet of cum smeared over the latter half.

Glancing down, the alicorn studied a particular passage. With her horn softly glowing, dimly illuminating the area, Luna quietly whispered, “Nomen Novissime Acutam.” As the words passed her lips, a curious jolt passed through her. It didn’t hurt, but it certainly startled her. Whatever had happened could wait, as she detected the sound of hushed hooffalls from outside. Throwing herself into a corner, just inside the doorway, she cloaked herself in an invisibility spell.

“I know you’re hiding somewhere near here, Luna. I can practically smell you,” Celestia teased, poking her head into the chamber. Inspecting the area, she recoiled slightly, when she noticed what looked like jizz on the floor. She dearly hoped the guards hadn’t been fornicating in the labyrinth again; the last time that had happened, it was a total ordeal of discerning who the culprits were, amongst all of the accompanying accusatory drama. “Oh, Luuunaaaa?” she called, her lilting voice resonating throughout the room.

Upon hearing her name called, Luna’s body tensed. She had to bite her tongue to keep herself from crying out. For whatever reason, she nearly came. It almost felt like...Oh no. Fearfully, she looked over at the cursed text. The book or, more pointedly, the spell in the book must have done something to her. Gritting her teeth, and dredging every ounce of willpower she had, she fought off the onslaught of euphoria.

Huffing, Celestia withdrew her head. Her sister must be close, so the mysterious, cum spattered book could wait. As she looked about, a notion took hold. Although it was an underhanded technique, the tactical use of her Royal Canterlot Voice could often goad her sister into appearing. Typically, she only used it under serious circumstances but, seeing as how they’d been playing for well over an hour, she was ready for her chance to hide from the younger alicorn. Clearing her throat, and feeling a bit guilty, Celestia prepared herself. “Luna! Show thyself at once!” she barked, the cacophonous call echoing throughout the catacombs with resounding force.

Luna’s eyes shot wide, as the shout accosted her eardrums. Her marehood clenched angrily, leaking the tiniest bit of nectar, as she fought to maintain control of herself. With all the might of legendary heroes and gods of old, she warred with her own body. The smallest, muffled yelp escaped her, but it did not go unnoticed. The noise of hooves on stone stopped, as her sister’s retreat halted. ‘No, no, nonononono,’ she desperately thought to herself, breaking into a cold sweat.

Igniting her horn with an enchantment detecting spell, Celestia wheeled around. She knew she heard something, which lead her to believe her sister was using some sort of concealment magic. “I’m going to fiiiiind you Luna!” she sang, prancing back from where she’d come. Hearing another stifled cry, closer this time, cemented her theory. Snaking her head back into the mysterious and seed spackled alcove, Celestia detected the slightest aberration of sorcerous energy coming from a nearby corner. “I found you, Luna!” she snickered. As she spoke, her sibling materialized, falling to the floor, while shivering uncontrollably.

It almost felt like she was dying. Compared to any of the illnesses or trails which Luna had faced, none had tested her so thoroughly as this curse. Only countless centuries of self discipline and control allowed her to restrain her bitterly betraying body. “C...bo…sis...” she burbled, unable to form full words. Every iota of her energy was being exhausted by the rapidly building carnal forces within her. It was like trying to hold back a tsunami, or fighting an act of god, so great was the effort.

“Luna. Poor, sweet, innocent, Luna. If I knew you’d resort to a paltry illusion, I’d have found you long ago, little Luna!” Celestia triumphantly clucked, circling her writhing sibling. She hadn’t seen a need for such childish behavior from her sister. Luna had always been a bit of a sore loser, but even this was a bit much. “Come now, Luna, it’s my turn to hide,” the elder Princess tutted, impatiently tapping a hoof to the floor. Strangely, her sister’s horn was crackling with energy, something which usually only happened when the smaller alicorn was preparing an exceptionally potent spell. “Well, I’m going to go hide now. Good luck, Luna!” Celestia added, turning to leave and seek a secluded spot.

Under the unfathomable force of pleasure, the dam began to burst. Luna’s eyes glowed brilliantly, and lightning bolts of raw power danced over her frame, as what little resolve she had crumbled. “I’m CUMMING!!!” she screamed. The impetus and fury of her release was, in a very real sense, ruinous. The culmination of her withheld orgasm culminated, resulting in a magical detonation heretofore unseen in Equestria. Were it not for the fact that the area of labyrinth they occupied lie well beyond the underside of the castle proper, their home would have been demolished outright.

Celestia, realizing the epic buildup of sorcerous power, invoked multiple wards and protective barriers to shield herself. Years of combating the evil forces which threatened her lands and her people had gifted her with lightning fast reflexes and a keen intellect. Silently, she thanked her years of training, laughing as she shrugged off the mystical assault. She knew, in the bottom of her heart, she’d never resign herself to being some token ruler, whiling away her days at useless meetings and eating pastries like a hedonistic despot. As the catastrophe subsided, Celestia took stock of the damage.

The area where Celestia stood had been obliterated. The setting sun dimly lit her surroundings, shining through the now open air. Glancing over, she saw the castle off in the distance, several hundred yards away. ‘Well, at least nopony was caught in the blast,’ she thought to herself, waving away the wisps of smoke and dust surrounding her. Looking about, her eyes settled on the limp form of her sister. “Luna!” she cried, scrambling to her sibling’s side. Her call caused the smaller mare to twitch and groan. A gout of juices squirted from her nethers. Thankfully, beyond the spontaneous emission, the alicorn seemed unharmed.

Besides the smaller Princess sat a book, the very same text from the semen soaked room she’d found her sister in. Then it dawned on her. Star Swirl always protected his precious volumes of literature with all manner of spells and enchantments. If the tome was his, and Celestia suspected it was, her sibling may have succumbed to one of its spells! “You stay here! I’ll go find Star Swirl and get this sorted out,” she whispered, stroking Luna’s cheek. Breaking into a full gallop, she took flight, going off to fetch the reclusive sorcerer.

Luna, as spent as she was, numbly watched her sister depart. Although she’d desperately need some sexual relief, she hadn’t planned on a climax bringing on devastation of that magnitude. She wheezed, breathing deeply and allowing herself to rest, as she awaited her dear sibling’s return. Luna couldn’t be sure, but she thought she heard a sonorous, mischievous laugh from the ether. Though she brushed it off as a mere delusion, the alicorn’s discharge had gained the attention of something otherworldly, something chaotic...