Author's Notes:

Contains: Grotesque situations, Mild Gore?
Written by Fuzzyfurvert for the Twilestia Skype group weekly flash prompts.

Celestia sighed quietly, her face otherwise frozen in her normal expression of benevolent bemusement that was her official ‘court face.’ The silence of the tower chamber was companionable, but boring. The tiny noises of breathing and the occasional ‘clink’ of metal on metal formed their own kind of soothing melody. She focused on nothing in particular, content to let her mind and eyes go where they would. Her gaze scanned the opposite wall for interesting patterns in the natural chaos on the surface of the polished marble tiles. After a moment, her eye caught a hint of Twilight Sparkle’s jawline in that chaotic swirl of stone and her mind filled in the rest of the blanks until it looked a close resemblance to the the original.

Eventually, she became bored again and her eyes wandered until they landed on the windows that looked out from the castle’s East Wing Tower, over a grey Horseshoe Lake, onward toward the smudge on the horizon that was the drifting city of Cloudsdale. The pegasi metropolis hung low in the sky, its outer edges lined with heavy snow-laden clouds. While she watched the city sail by at a snail’s pace, light snowflakes started to fall from the stormbank that hovered above Canterlot.

“Oh look, it’s snowing. Perhaps later, we can take a moment to enjoy it with some warm chocolate?” Celestia brightened and glanced over at her sole company in the unheated room, Twilight Sparkle.

The metallic clinking noises stopped. “Please don’t talk.” Twilight frowned and her horn flashed as she adjusted the lantern’s reflector dish to brighten her work area. She squinted through an oversized magnifying at an equally oversized lung on a steel medical tray. The organ glistened and shimmered faintly in the light. Under magnification, Twilight could make out row after row of tiny glowing runes in a complex arcane pattern. “You might feel a pinch, but could you take a deep breath for me?”

Celestia rolled her eyes, but she did as requested and took a deep breath in through her nose. The lung on the tray—as well as its twin which was still located in her open chest—inflated obediently and tinkled with little flashes of mana.

“Fascinating.” Twilight scribbled additional notes on a long scroll of similar observations in her tight, neat hoofwriting. “I can understand why you couldn’t remember how the spell was structured. This is amazingly complex! There is a line in here for every ailment I’ve ever heard of and plenty I haven’t.” She paused in her note taking. “Is ‘The Mondays’ a real sickness?”

Celestia nodded as well as her position on the table and the clamps allowed her such movement. “Well, I assume so. The spell was designed by Starswirl to make me immune to any illness I encountered.” A wistful smile played across her lips. “In the early days after Luna’s banishment, he was petrified with the fear that I might take ill and be unable to rule Equestria for a time. Which, in turn, would mean he would have to rule in my stead.”

“Much like I would now?” Twilight raised an eyebrow and moved her lantern spotlight to a tray that was holding Celestia’s stomach and much of her intestinal tract. Almost microscopic rune work covered them just as it did Celestia’s lungs. The runes were part of the same spell and protected the alicorn princess from diseases and illnesses, from septic shock and food poisoning to gas. “I’m impressed, again, with how detailed his work was.” She chewed her lip for a moment and then looked back into Celestia’s eyes. “Was that the only way we’re alike, Starswirl and I?”

Celestia did her best to shrug with just her face. Twilight and Starswirl shared many traits, on the surface. They were both smart in ways that sometimes defied explanation, they both were talented beyond measure, and both had dedicated their lives in service to Equestria and her Princess. Twilight knew that well enough. “If you are asking if I slept with him as I do you, my dear, the answer is not really.”

“‘Not really?’” Twilight put down her quill slowly and turned to face Celestia. “What does that mean?”

“It means not really.” Celestia smiled softly. “As in I did not sleep with him as the modern definition of such things go. I cared for him deeply, Twilight. We were as close as friends could be and we spent a great deal of time together. He was a handsome colt in his younger days. We were romantic with each other, shortly, but it didn’t work out.” She chuckled and her exposed lungs rippled with flashes of magenta at the exertion. “It was the beard, you see. It tickled when we kissed!”

“Wait,” Twilight blinked slowly, “you’re telling me that you dumped Starswirl the Bearded…because his beard tickled?”

“No. Not just because his beard tickled.” Celestia closed her eyes and let the memories play across the blackness. She lowered her voice when she continued. “I discovered, back then, that I prefered the softer side of the bed, so to speak, and the softer mares that went with it. I spent many nights alone and confused as I came to grips with that. Starswirl was the only soul that knew. I shared everything with him in those days. That’s why I allowed him to place this enchantment that keeps me forever healthy.”

Twilight was silent for a long time and then turned back to the lung she was studying. Celestia watched her work, breathing slowly so Twilight did not lose her place on the living inscription.

After several minutes, Celestia cleared her throat. “You can look. I don’t mind, Twilight. I’m not hiding anything from you.”

“What do you mean?” Twilight’s voice was soft and she remained hunched and defensive over Celestia’s lungs, refusing to look the Princess in the eye.

“Look, Twilight, it will ease your mind.” Celestia’s horn started to glow and the faint aura along the edges of her spread open torso took on a golden hue as she assumed command of the spell. There was a sound, like wet, heavy parchment being torn as her coat and skin split further down her middle. The muscle and sinew split next and opened like a red and white meat-flower, until the top of her hip bone stuck out and Twilight could see the gentle swell of Celestia’s reproductive organs. “Check them.”

“Are...are you sure?” Twilight swallowed and leaned forward despite herself. “You don’t have to. I trust you.”

“I know you do. But I know you, Twilight. The question will eat away at you. So look, while the chance presents itself.” Celestia smiled and gestured down her body with a flex of her muzzle.

Twilight swallowed nervously again and lifted her lantern to shine the light into the cavity of Celestia’s torso. The light illuminated the wet outer surface of Celestia’s uterus which, unlike her other viscera, was not crawling with glowing rune work. There were runes, but they covered only a small portion of the organ. They spelled out the expected things, cancer, necrosis, hemorrhaging, etc. That was it.

Twilight blinked and moved the light around, checking the different angles. There weren’t any further runes. “So...no cervical diseases?”

“Nope, thankfully.” Celestia waited. “Care to guess why?”

Twilight swallowed and set the lantern down on the table. “You’ve never been exposed to anything?”

“If you’ll take my word for it, I can promise you that even my hymen is still intact.” Celestia smiled. “I’ve been saving it for a very special somefilly. A filly I could share my life with. A filly that has a sweet purple flank and the wherewithal to take a piece out of me.”

Twilight smiled sheepishly, blushing brightly in the wane light. She brushed her mane back behind her ear and leaned over further to gently touch one Celestia’s exposed ovaries. The princess gasped and twisted slightly, the pins and spell holding her still.

“So...this is mine, then?” Twilight’s smile turned loving as she caressed the inner surfaces of her immortal ruler. “It’s untouched. Virginal. If...if I mated you, would it add to these runes?”

Celestia gasped again and gritted her teeth as Twilight’s hoof sank out of her vision into the cavern of her body cavity. “Y-yes...it’s yours, Twilight. I’m all yours, if you want.” She hissed between her teeth and tried to lift her head to see. “Gods, that feels weird.”

“Do you want me to stop?” Twilight kept her eyes on the wet, slick organs in front of her. She giggled under her breath and reached lower until she could feel the firm resilience of Celestia’s pelvic bones. It felt like hot iron under her hoof, as solid as the mountain the castle clung to. She could do anything she wanted and Celestia could take it. Twilight licked her lips impatiently and pulled her hoof out only to reach down and run it over Celestia’s pussy. “I wonder what it looks like when you cum?”

“Twi...Twilight, please!” Celestia groaned, but if it was in pain or pleasure, Twilight couldn’t be sure.

“Do you want me to stop?” She repeated.

Celestia started to breathe faster, her lungs creating a veritable laser light show from the exertion. Her muscles, all along the walls of her abdominals, clenched and relaxed over and over. “N-no...don’t stop, please.”

Twilight nodded slowly, her smile growing as she sped up her ministrations against Celestia’s nub and the folds of her sex. Each time she made a pass over the opening, she felt it dilate a bit more until she was able to work half of her hoof inside. As she did so, she noted idly how she could see the bulge quite clearly with Celestia’s torso flayed open. Twilight started to breathe faster, along with Celestia and jumped when she felt something brush between her legs.

She looked up to see Celestia’s horn lit once more and gasped when she felt the hot pressure of the Princess’ aura open her own folds and force it’s way in rough enough to almost lift her off her hooves. “Cel-Celestia?”

“Two...can play...at this game.” Celestia grinned wickedly. “First one to bottom out cooks dinner?”

“You’re on!”