Sunlight beamed through the window of Princess Celestia’s sitting room as the royal mare herself laughed, her horn’s golden aura setting a cup and saucer down with a delicate ‘clink.’

“Oh, Loose Lip, you’re such a card,” the Princess said after wiping a tear away. “I’m so glad you were able to come and visit today. It’s been too long since we’ve gotten to spend any time together.” She sighed, smiling at her visitor, a cream-colored stallion with a coiffed green mane and a pair of half-moon glasses. On his flank was a cutie mark depicting a silhouette of one pony whispering in another’s ear.

“Same, Your Majesty. Of course, it’s mostly your fault, sending me away on those ‘diplomatic fact gathering’ trips,” the stallion replied, playfully quoting with his hooves.

“Are you sure it isn’t your fault for being so good at what you do?”

“More like my fault for being so easily swayed by a cute face.”

The princess smirked. “Flatterer.”

She turned her head and looked out the window, down into the streets of Canterlot. The ivory towers began to turn gold as the afternoon sun began to set, matching the colors of the fall leaves that dotted the streets and corners of Equestria’s capital. Everything was busier than usual, however, as dark banners and wooden stalls were being set up not just here in Canterlot, but all over the pony nation. A large, dark blue flag with a crescent moon made clear the occasion.

“Nightmere Night,” sighed Celestia. Though it was one of Equestria’s most beloved holidays, the event always brought back painful memories for the alabaster alicorn. “Loosey,” she said, turning back to her guest. “Did I ever tell you about how this night started?”

Loose Lip shifted on his pillow, pondering. “No… No I don’t think so. What’s the story?”

Celestia took another sip of her tea and gazed out the window. “It all started after I banished my sister to the moon,” she began, frowning. “Almost a year had passed since I had used the Elements against my best friend, and her absence seemed almost too much to bear. After all she’d done to Equestria, ponies began praising me for the one decision I regretted most of all. I knew they would never see her as the loving sister I remembered, but I could still keep her memory alive. Maybe even with something positive.”

Loose Lip nodded. “So you made the anniversary of her banishment...”

“Nightmare Night. Yes.” Celestia nodded. “She and I had always loved practical jokes, so it seemed fitting to focus on scares. And night, obviously. She’d always been so sad that hardly anyone loved her night. I suppose this was my way of making up for everything. Letting others see how beautiful it was. How beautiful she was.”

Celestia watched as her subjects hastily and merrily prepared for the night’s festivities. At the rate things were going, this was looking to be the biggest Nightmare Night ever. Celestia’s smile returned. “I’m so glad she’s returned. And she was so happy when she found out that there was a whole holiday dedicated to her. Oh, you should have seen the look on her face when I told her all about it.” Celestia clopped her hooves together, beaming.

Loose Lip sipped his tea again. “And after that, the legend of Nightmare Moon came about, right? Giving her candy, gobbling up ponies. Wearing disguises. That sort of thing?”

Celestia nodded. “Half-truths which got embellished over time. You know how those things go.” She sipped.

“Some of that sounds like more than just embellishment, Princess,” Loose Lip replied.

Celestia blinked. “What I mean is, the tale grew in the telling.”

“How does covering the world in eternal night lead to costumes and eating ponies?”

Celestia shrugged. “Er, well… it’s from a turn of phrase.”

Loose Lip simply raised a brow and leaned forward. Celestia, in turn, took another sip.

“Princess?”

“Y-yes, what is it?”

“I know that look, Princess. You’re hiding something. Come on, we’ve been friends for years. Spill! What’s the matter?”

Celestia felt her brow moistening. She looked to the window and then back at her friend. “Loosey, I have to get ready for the festivities.”

“You don’t need to set the sun for another two hours,” Loose Lip pointed out. “Come ooooooon...” The stallion didn’t like using his special talent for coaxing information out of ponies on his friends, but curiosity often got the better of him. He stared into her eyes, his glasses sliding down his nose, exposing Celestia to the intensity of his deep, blue eyes.

Celestia caved.

“Oh, fine,” she groaned. “But you must promise not to tell a soul,” the Princess implored, leaning across the table.

“My lips are sealed,” the stallion answered, leaning forward to meet her.

Celestia tensed up, then relaxed. “I’m… not very proud of this but, long ago, when Starswirl first turned Equestria into a Principality… we had the death penalty.”

“Oh.”

Celestia seemed to shrink back. “It was a different time… we thought it was necessary to maintain order. We didn’t use it that much… But traditional methods were too gruesome. That’s when Luna found an ancient text that spoke of something called ‘cock vore.’"

“Huh?”

“Luna has a… condition. I really don’t know how to say this,” she said, as Loose Lip drank his tea, eyes locked forward, “but… she has a penis. And testicles.”

The green-haired stallion spat out his drink with shock, spraying tea all over Celestia who barely managed to avoid being drenched by throwing up magic shield. She sighed.

“Yes, she… has male parts in addition to her female ones. Th-that’s a story for a different time. If ever. I really shouldn’t be telling you this.”

Loose Lip stood up. “Nonononono! Please, go on!”

Celestia relented with a groan but without protest and continued. “It’s an old kind of dark magic where a pony uses their penis to devour others. There’s no blood. No body left behind. At the time, it seemed like the best option. Executions still had to be held in public, however, which was something that always made Luna self-conscious. I think that’s why she began spending so much time alone.”

“Anyway, that’s how the fable of Nightmare Moon eating ponies came about. The costumes were probably inspired by fugitives in disguise.”

Celestia seemed to finally relax after telling Loose Lip everything. For his part, Loose Lip seemed to almost regret asking.

“Well, I’m glad I know, now… I think?”

Celestia looked up, a grave expression on her face.

“I mean what I said before, Loose Lip. Do not tell a soul. Understand?”

Loose Lip pushed his glasses up and smiled nervously.

“Of course,” he answered. “My lips are sealed!”

✳ ✳ ✳ ✳ ✳

Princess Luna yawned, stretching as she awoke from her day’s slumber. The rays of the late afternoon sun had aroused her from her sleep, and she blinked disdainfully at the light.

“Nnnnnn. Just five more minutes,” she groaned, rolling away from her window. As she did so, however, she felt a dull pain preventing her from further action.

“Oh… not again.”

The princess rolled onto her back once more and threw back the covers with a sigh. It didn’t happen terribly often, but she’d learned the hard way that it was better to deal with this sort of thing immediately. It wouldn’t go away, otherwise.

A long shadow was cast from Luna’s bed away from the balcony window. But it wasn’t from her horn. Nor was it from any of her bedposts.

Between Luna’s thighs rose a towering, smooth horsecock, black as the night itself and splotched with dark blue towards the base. It pulsated slowly in time with its owner’s heartbeat, and bucked every few seconds. Altogether, it was nearly two feet long. Two, smooth, round balls sat beneath the monstrosity, swollen with a week’s worth of cum until by now they were each the size of a grapefruit.

Luna sighed and reached out with her magic, biting her lower lip as faint, azure glow wrapped itself around the mare’s member. “Easy does it…”

The alicorn wiggled her hips, her penis swaying at the movement as the glow began to move up towards the flared, black tip, before coming back down to the base, eliciting a moan from the mare. She hated that this thing was a part of her, always making itself known when she least expected. And yet, she very much enjoyed the alone time.

The glow squeezed around the fat cock, increasing in speed as it pumped away at the pulsing organ. Luna smiled in spite of herself, licking her lips as her tip began leaking pre from her tip, the magic spreading it around her to ease the pumping. She stayed like this for a while, rhythmically stroking herself, panting and bucking her hips once in a while. “Mmmmmm.”

Eventually, she felt a tug in her balls, letting her know her private time was almost over. Picking up the pace once more, the magic hummed around her dick, and Luna’s every breath became heavier and heavier. She was so close, she could feel it. Her balls contracted, and a large lump made its way from the base of the pony’s cock to the tip.

The bedchamber doors swung open.

“Luna, wake up,” came Celestia’s voice. “It’s ti… L-Luna!”

“T-Tiaaaaaaaaaaaaaaa-” came Luna’s shocked reply, her sister’s name morphing into an orgasmic moan as a thick blast of semen was launched from Luna’s cock, the thick rope of white cream arcing across the room and landing across her sister’s face. It coated her mane and nose, leaving the elder of the two sisters gaping, eyes wide with shock.

Luna groaned as her orgasm subsided, a few more spurts landing on her sheets. She winced as she saw what she’d done to her beloved sister.

“Celestia. I-I’m so sorry. I didn’t mean-”

“It’s fine,” Celestia said, cutting her off. “I shouldn’t have barged in so suddenly. I’ll knock next time.” She took a cloth lying near the door and used it to wipe her face. Her hair would need a wash, however. Meanwhile, Luna pulled the covers back up to hide her drooping dick as her erection went back down.

“Ahem. Was there something you needed sister?”

Celestia looked back up. “Oh, yes. Thank you. I just thought you might like to get an early start for this evening. You remember what day it is, don’t you?”

Luna looked back and forth between her sister’s eyes before realization hit her and she beamed. “Nightmare Night!” She threw back the covers once more and looked out the balcony. Everything was almost complete, everypony gathering in the streets for the big opening of the spookiest night in Equestria.

Luna trotted in place giddily. “Oh, Tia, I can’t wait. I need to get dressed! No, showered! Then dressed! Oh, thank you so much for waking me up! I have to go!”

Flaring her wings, she sped off to her bath chamber, not even bothering shut the door behind her. Celestia rolled her eyes and followed her out. She smiled. It made her happy to see her sister so excited. She was grateful for having a second chance to be sisters. But just as she was about to leave the room, she noticed her reflection in Luna’s vanity. She frowned as she saw one last dollop of thick mare spunk on her regal nose. She thought for a moment and looked down the hallway. Luna was already gone. She looked back at the mirror.

“Waste not,” she decided, and licked the offending cum up.

Author's Note

And so it begins. I really don't know how I got roped into this. It's really my fault for saying I'd write it. You've been warned.