Nightmare didn’t answer. Instead, her expression became determined. “Your vagina is haunted,” she repeated slowly.

“M-Moony, if this is suppose to be a joke, it’s not funny,” Celestia said, feeling tears starting to well up in her eyes.

Nightmare’s eyes narrowed and she started to stalk forward.

“Moony, what are you doING?” Celestia’s voice jumped a couple of octaves as Nightmare pulled her thighs apart and dove back at her sex with passion, making her bolt upright.

Nightmare drove her tongue back into Celestia, making the alicorn squeal in surprise. Pearlescent hooves gripped the back of her head, holding her in place, which was fine; she needed to stay where she was.

Again Nightmare felt that cold trickle, but she didn’t let it scare her off. Instead, she only pushed her tongue deeper, trying to find the source of the chill.

"Interesting... most would have fled by now," the voice again whispered in her ear, now smoother and slightly accented. "What makes you different?"

I am your worst Nightmare. Nightmare replied through her mind, pushing more of her unnaturally long tongue inside Celestia. The alabaster alicorn moaned happily and tightened her grip on Nightmare’s head.

"Ha, a bold statement," the voice said mockingly, sending another cold, ghostly chill down her spine. "But is there any weight behind it?"

Nightmare didn’t bother replying but instead sent a pulse of magic through her tongue, trying to draw the Spirit out. The spell failed, the Spirit’s mocking laughter evident of that, but the pulse seemed to have an effect on Celestia. The solar princess reached a high-note that caused every dog in a one-mile-radius of the castle to start barking, and her quim clamped down on Nightmare’s tongue, squeezing it like it was a stallion’s cock and drenching the dark alicorn’s muzzle in mare-cum.

Once her orgasm faded, Celestia collapsed backwards like a puppet with its strings cut, a dazed and happy look plastered over her muzzle. Nightmare pulled back once the hooves released her, love-juice dripping from her snout and her tongue, which hung out of her open and panting mouth.

I didn’t get it. Nightmare thought with disappointment. Celestia had been acting odd at times lately, and this Spirit currently occupying her quim seemed like the cause. And now, she had failed to capture it.

Celestia didn’t seem to mind though, humming a happy and aimless tune as she looked up at the ceiling with glazed eyes.

“Oh Moony, I needed that…” she said airily. “I feel better already.” she shook herself slightly and rolled to her hooves. “You were right, I’m fine. Let’s go help Luna with the preparations.”

Nightmare tilted her head at that. Celestia, for all her love and kindness, was always one for weaseling out of any kind of physical task. Why would she suddenly want to…. Ah, of course! Spirits fed off of sugar and goodness! Celestia’s sudden depression was an effort to make her eat candy. And now suddenly wanting to help? There was a feast of sweets in the gardens where Luna was setting up.

Still, even if Nightmare tried to explain this to Celestia, the alicorn would laugh her off, or worse, freak out again. The Spirit was clearly playing havoc with her emotions; she was never this much of a mood swinger. Still, certain emotions were too strong to be overwritten…

And maybe there was a different way to get the Spirit out.

“Actually, there’s something I wanted to do first,” Nightmare said, blocking Celestia’s path to the door as she wiped her muzzle clean.

“Oh?” Celestia asked with a tilt of her head.

“Remember that fantasy of yours you told me about?” Nightmare purred, putting on her best sexy look. “I want to do that.” she leaned close and whispered in Celestia’s ear. “Right here, right now.”

“I’ll call Twilight!” Celestia squealed joyously, a quill and scroll already flying towards her when Nightmare shook her head.

“What? No!” she sighed. “The other one.”

“The other one?”

“You know,” Nightmare said huskily, “The other one.” she made a few thrusts with her hips for emphasis.

Celestia’s eyes lit up. “You mean…?”

Nightmare nodded, biting her bottom lip. “Mm-hm. You know the spell?”

Celestia blushed. “I, uh, could find it.”

“No need,” Nightmare said as her horn glowed and Celestia felt heat suffuse her groin.

The alabaster alicorn rocked on unsteady hooves for a moment as the spell did its work, reshaping her body and organs. When it was done and the heat faded, Celestia felt something heavy hanging down. Looking between her legs, she was delighted to find a penis and pair of heavy testicles fit for an alicorn, the shaft already hardening.

“Oh, wow,” Celestia said. “This feels weird.” she let out a soft moan. “Oh, but oh so good.”

“Shall we?” Nightmare called as she trotted towards the bedroom.

Celestia followed like an eager puppy. A well-endowed eager puppy. …Eww, I don’t like that metaphor. No, Celestia followed her like a mare about to experience what the other sex felt like. Yeah, much better.

“I thought you were going to save this for our wedding night,” Celestia said as she closed the door behind herself and jumped onto her bed.

“I’m saving myself for our wedding night,” Nightmare replied as she climbed onto the bed. “But my mouth is a different story.”

Celestia grinned and laid herself out on the bed, presenting herself for her mate’s eyes. “And what prompted this sudden thirst for my magically-induced cum, Moony?”

In place of an actual reply which would only lead to questions which would only lead to confusion which would only delay and ruin her hastily cobbled plan, Nightmare opted to allow the entirety of her to tongue slide out of her mouth. Celestia’s cock jumped.

Grinning, Nightmare climbed onto the bed and quickly snatched the shaft with her hooves, guiding the flared head between her lips and coiling her tongue down around the shaft. When the tip came into contact with Celestia’s new sac, a familiar voice whispered in her ear.

"And what is this supposed to accomplish?" the Spirit asked, sounding bored. "All I want is a little bit of sweets. What is so wrong with that?"

What’s wrong is you’re using my bride to do it and you made her hate herself for well over a day. Nightmare replied, beginning to slide her coiled tongue up and down Celestia’s shaft as she scooted her body closer to her fellow alicorn. I’m going to end you.

"Oh really?"

Nightmare didn’t bother answering. Instead, she focused on taking more of Celestia’s cock into her mouth. The Spirit might actually have a point and this could just be a stupid idea, but Nightmare thought changing Celestia into a male for a time and then making her cum might just force the Spirit out.

Or maybe she was horny and out of ideas. Finding out your mare’s vagina is haunted can throw you for a loop, even if you are the paragon of spooky.

Nightmare was just feeling the flare of Celestia’s cock at the back of her tongue when something warm and wet suddenly found its way between her own thighs. Her eyes widened in surprise and she nearly chocked on the cock in her mouth before pulling it out. She shot a look over her shoulder to Celestia, who stuck out her tongue at her.

“Turn about, dear Moony,” she giggled, immediately ducking her head back down and getting another gasp from Nightmare.

The black alicorn gritted her teeth, trying to ignore the jolts of pleasure Celestia’s tongue was sending through her body. It went about as well as you’d expect. She hurriedly stuffed Celestia’s spit-soaked shaft back into her mouth, long, serpentine tongue wrapping around it, trying to finish her off before the damned sun-goddess made her cum.

It didn’t work. In spite of being so worked up about the whole haunted vagina thing, it was hard to go down on the mare you planned to spend the rest of your immortal life with and not get a little excited. And Celestia was just as dexterous with her tongue as Nightmare was.

Nightmare let out a low, throaty moan, sending vibrations through the organ in her mouth, as Celestia’s questing tongue found that sweet spot that always pushed her over the edge. She screwed her eyes shut, her whole body shaking as a wave of pleasure rocked her system. She lost track of time for a moment or two, finding herself drooling on Celestia’s shaft, now with the head wedged in her cheek, and the alicorn herself lazily licking her still quivering folds, sending little sparks along her nerves.

"Enjoy that?" the Spirit suddenly asked, spoiling the moment.

Eyes narrowing, Nightmare adjusted the angle of Celestia’s shaft and lined her own head up with it. After a moment of steeling herself, Nightmare lunged her head forward, taking the entirety of Celestia’s cock in a single move.

“Hhnck!”

This wasn’t the smartest thing she had ever done. Nightmare’s throat convulsed, squeezing down on the sudden intruder. She tried to back off, but before she could Celestia’s hoof was on the back of her head, holding her in place.

“Oh, Moony,” Celestia groaned from behind her, hoof pushing her down until her nose met Celestia’s belly.

"Having trouble?" the Spirit asked mockingly.

Nightmare couldn’t form a response. Her throat squeezed down like a vice around Celestia’s shaft, cutting off her air flow. The alabaster alicorn was clueless, hooves tightly keeping Nightmare where she was. Her vision starting to grey at the edges, Nightmare tried jabbing her head forward. It had the desired effect.

“Ow!”

The hooves on her head released and Nightmare pulled herself back, going into a coughing fit once her throat was clear.

“What was that for?” Celestia asked, rubbing the spot where Nightmare’s horn had jabbed her.

It was a minute before Nightmare could respond, still coughing. Eventually she managed to rasp, “I need air, you know.”

A deep, red blush spread across Celestia’s face. “Oh,” she looked away. “S-sorry, Moony.”

Nightmare sighed and glared at Celestia’s groin, still hearing the Spirit mocking her.

“Moony?”

Nightmare looked back to Celestia.

The alicorn nervously tapped her hooves together. “Listen, if you, uh, don’t want to keep doing this, I understand.”

Nightmare flared her nostrils. She didn’t care if that was Celestia or the Spirit talking. She wasn’t stopping just yet. She cleared her throat.

“I’m finishing this,” Nightmare said, advancing on Celestia. “But,”

Her horn glowed as a few lengths of rope were retrieved from beneath the bed. With them floating in the air behind her, Nightmare pushed Celestia onto her back, motioning for her to spread her limbs. The white alicorn complied and Nightmare used the rope to tie each of Celestia’s hooves to corner of the bed.

“There we go,” Nightmare said, testing the binds to ensure they were as tight as they needed to be. “Now, just try to relax and think about all the ways you’re going to be paying me back for this.”

Celestia just smiled sheepishly and nodded.

Returning the smile, Nightmare sat down on her haunches at the edge of the bed, examining the still stone-hard organ standing at attention between her lover’s legs.

Leaning forward, she put her lips at the base of the shaft, balls grazing her chin.

"You just don’t give up, do you?" the Spirit said, sounding genuinely perplexed.

Last chance to leave willingly. Nightmare warned, horn beginning to glow.

"Pass."

Nightmare felt a faint grin on her lips. Turning her head to the side, she began gently nibbling the shaft as she worked her way up its length, horn glowing brighter.

“…Moony?” Celestia’s voice wavered as sparks of pleasure danced from her groin. “W-what kind of spell is that?”

Nightmare didn’t answer. She added her tongue to the mix as she moved up and down the turgid cock before her, eliciting cute little moans from Celestia. Dipping her head lower, Nightmare swiped her tongue over the alicorn’s balls, slathering them in saliva before sucking one into her mouth.

"This is all quite amusing, but do you really think it’s going to work this time?" The Spirit sounded almost bored now.

Pulling her lips away with a wet ‘pop’, Nightmare chuckled to herself before dipping her head even lower and ever so gently touching the tip of her horn to Celestia’s testicles. The glow in her horn transferred itself to the celestial sack, retaining its blue hue.

“What was that?” Celestia and the Spirit asked in unison.

“Shhhhh,” Nightmare hushed, before allowing her tongue to slide from her mouth and wrap itself around Celestia’s cock.

Celestia whined and pulled at the ropes as Nightmare slathered her cock in alicorn slobber, the rising heat in her balls distracting her from the pleasing sensations.

“Moony…” she said at about half an octave too high. “What did you do?”

Nightmare slurped her tongue back into her mouth and gave an overly-exasperated sigh, hoof stroking Celestia’s cock. “If you’re going to complain…” she said, levitating something else out from under the bed.

Celestia’s eyes widened as Nightmare held up a purple ball gag with a suspiciously familiar pink star emblazoned on it.

“Where did you get that?” Celestia demanded, pulling in earnest at her bindings. “Nightmare-Moon, if you -mmph!”

“Hush now,” Nightmare said as she secured the straps on the gag with her magic. “And try to remember I love you.”

Wetting her lips, Nightmare placed them over the head of Celestia’s cock, keeping her hoof in place as she slowly slid the organ into her mouth.

“You realize she has magic, right?” The Spirit was saying.

Nightmare simply ignored the words in her mind as she took as much of the shaft as she could into her maw, feeling the head sliding just over the back of her tongue. Celestia made a muffled noise as Nightmare slid most of the shaft out of her mouth, feeling the dark alicorn’s fangs brushing against her cock.

“Listen, it’s getting a little too warm and magical for my liking, I’m-”

Whatever the Spirit was going to say was lost as Nightmare suddenly opened her jaw wider and then bit down on Celestia’s cock.

Had she not been gagged, Celetia’s scream very well could have shattered glass. But hers was nothing compared to the sudden cry the Spirit made.

“What the fuck!”

Pulling the cock entirely from her mouth, Nightmare gently licked the tiny incision her fang had made. The taste of blood mixed with masculine musk, delighting Nightmare’s taste buds. She felt a little guilty, but it was necessary. It disrupted the Spirit and allowed her binding spell to work.

As the glow surrounding Celestia’s balls shifted to green, the alicorn was blinking tears from her eyes, wondering why in the world Nightmare had done that.

A quick healing spell and more licks chased the pain away, replacing it with more of those delicious sparks of pleasure. Nightmare slid her lips back down Celestia’s shaft, feeling it poke the back of her throat once more. Taking a few quick breaths in through her nose, Nightmare pushed herself up before forcing her head down.

It was smoother this time, Nightmare’s nose bumping into Celestia’s groin as she took all of the alicorn’s cock. Celestia gave another muffled cry, hips bucking as Nightmare slid her cock out of her mouth. The dark alicorn made eye contact with her lighter lover and gave her a wink before plunging downwards again, smushing her muzzle into Celestia’s groin, twisting her head and swallowing around the shaft.

Celestia’s whole body shuddered and Nightmare felt a sudden warmth shoot down her throat. She moaned appreciatively around the shaft, bobbing her head as the green glow below her intensified for a moment. Sliding her lips back up the still cumming cock, Nightmare could see the green glow make its way up the shaft, going into Nightmare’s mouth along with another load of cum.

Celestia shuddered again before going limp, head lolling to the side as she made more muffled sounds.

Nightmare pursed her lips as she pulled off of Celestia’s shaft, trapping the cum and Spirit inside.

The Spirit was pleading with her now, all trace of cockiness gone.

"Please, please, please let me go!" the Spirit begged. "I did not mean to insult you, oh goddess, please give me another chance!”

Nightmare paused like she was thinking about it, before simply replying Pass.

She tilted her head back and swallowed hard. Her neck bulged as it carried Celestia’s cum and the recently ousted Spirit to Nightmare stomach, which would hold the entity until she was ready to dispose of him.

Sighing contently and belching softly, Nightmare began to untie Celestia, undoing each knot with deliberate slowness before gently pulling the ball gag from her mouth. The purple ball was soaked in spit.

Celestia worked her jaw a few times before glaring tiredly at Nightmare.

“You fucking bit me,” she said, sounding more exhausted than angry.

“Kinky, right?” Nightmare replied cheekily as she climbed onto the bed, gently nuzzling Celestia.

“Try crazy,” Celestia sighed before giving Nightmare a chaste kiss. “Still, I do feel better.”

Nightmare giggled. “I’m glad.”

They laid together for who knew how long before the sound of a door opening and hoof steps reached them.

Luna pushed open the door to the bedroom, concerned about her sister. “Hey, how is it going you two- MY FUCKING EYES!”

“Sorry, Lulu!”

Author's Notes:

This languished unfinished on my hard-drive for months. Now it is finished and Please forgive me.