Stress Relief

by Cloplestia

Rating: mature
Tags: Sex, Fetish, Princess Celestia, Princess Luna, My Little Pony: Friendship is Magic, Porn
Length: 5774

Luna visits Celestia to help out with a problem, but she has the wrong problem in mind.

Luna comes by to give her sister some sisterly advice. But it seems the problem she thought she knew was not the problem Celestia was wrestling with at all.

Contains futa, incest, and literature.

An entry in the Incest is Wincest April 2019 Sibling Incest Contest.

Published 2019-04-24 01:00:01 UTC
Last updated 2019-04-24 01:00:01 UTC

Stress Relief

Luna settled to the balcony of her sister's spacious apartments in a tower of Canterlot Castle, unobserved by anypony save perhaps a patrol of the Night Guard flying their rounds. They would not see anything amiss in her presence, of course.

She peered through the glass door into the apartments. Though her silhouette etched in the moonlight spilling across the floor seemed blindingly visible to her, Celestia had not yet noticed. Luna was slightly miffed—the room was softly lit, with only a few lamps, and she would have expected her interruption of the moonlight to have been at least slightly noticeable. Then again, day ponies. And also Celestia seemed to be absorbed in paperwork. She was hunched over a desk scattered with stacks of papers, studying one in particular, a pen held in her magic. Periodically she added a line in her careful hoofwriting, or occasionally scratched one out.

Luna thrust the balcony doors open dramatically and strode into the room. She grinned to see Celestia jump to her hooves in startlement, plainly discombobulated enough that she spilled a few sheets from an adjacent stack across her work.

Celestia settled her pen to the desk. “Luna,” she scolded, “you could have knocked.”

“Why? Were you up to something embarrassing?”

Celestia rolled her eyes. “Of course not. Just doing some paperwork.”

“No,” Luna agreed, “I should have known. It's rather gloomy in here, by your standards.” She stepped over to the desk and glanced at the topmost paper. “'Concrete requisition for anticipated spring sidewalk repairs in Manehattan.'” She snorted. “Diving a little deep into the minutia, aren't we?”

“A ruler should have a sense of her land's needs.”

Luna shook her head. “This sort of thing is best left to the civil engineers and local government. You actually shouldn't waste time fretting over it.” She paused, and tapped one hoof to her chin. “Unless of course you're fretting over it so you won't fret over something else,” she added slyly.

Celestia turned up her nose. “You'd be surprised how often such little details turn out to be useful.”

Luna snorted. “A little birdie told me you've been out of sorts all day.”

“Oh really. Well, Blueblood was being bothersome as usual, not to mention a delegation of Canterlot nobles were complaining about the parks tax.”

“Mmm,” said Luna. “You know, I hear you had a private meeting with Twilight Sparkle today, too.”

Celestia frowned. “Administrative business concerning her School of Friendship, and a little teaching advice. Why do you ask?”

Luna smirked. “Is that aaaalllll?”

“What? Yes, that's all.”

“I heard she might have confessed to you, that's all.”

“What?! Who told you that?”

“So it's true?”

“It is most emphatically not true. Who told you that?”

“Mmm... Blueblood?”

Celestia rolled her eyes. “Consider the source.”

Luna pouted. “Well, it seemed credible. I thought you were rather sweet on her. It seems like you always have your eyes on her, when you think nopony is looking. Like you're thirsty for the sight of her.”

A hot spark of annoyance flashed through Celestia. “Little sisters should mind their own business!” she snapped.

“Ooh, touchy.” Luna sidled up to her, brushing against her warm flanks. “So, are you sure she didn't confess to you?”

“Did you have a purpose in coming here, or are you just out to irritate me?”

“Because if she did, I want to hear the details!” Luna hopped up and hooked a foreleg over Celestia's withers. Her weight bore down on Celestia's shoulders, and she brought her lips to one white ear and whispered, “Was it romantic? Or was she adorably awkward?”

Celestia grit her teeth. “There. Was. No. Confession. And you are just being a gossip.”

“Boo,” said Luna, disappointment lining her voice. “Maybe you should do the confessing.”

“Ugh. Luna, she has shown no signs of being interested, and... okay. She is a fine-looking mare, but not what I am looking for. Not to mention...”

Luna traced circles on Celestia's chest with her free hoof. “Not to mention what?”

Celestia felt her cheeks burn in embarrassment. “You know, Luna. My... condition.”

Luna's hoof stopped, and a tension entered her muscles. Her eyes narrowed. “Your 'condition.' Sister, are you running away from relationships because you're afraid ponies won't accept... this?” Luna shifted her balance, hanging onto Celestia as she brought one hind hoof up between her sister's thighs.

What was hidden by a spell of illusion was perfectly revealed to physical touch. Celestia's breath hitched in her throat as Luna's hoof found her heavy balls and rubbed gently at them. Luna moved her hoof moved forward, caressing Celestia's sheath.

“Luna, quit. How am I supposed to explain I have a... I have this too?”

Luna snorted. “If I had one, I wouldn't cloak it in spells, that's for sure! I'd flaunt it everywhere I went! Maybe you should try that.” Luna paused. “Oh my, does that idea appeal to you?”

Celestia's cheeks were now red-hot. Luna's questing hoof had moved forward far enough to discover Celestia's cock was not quietly packed away in her sheath, but was standing rampant beneath her belly, fully erect.

“It's nothing, Luna. Sometimes a pony gets an erection, it doesn't mean anything.”

“It that so?” Luna dragged her hoof slowly up the shaft. It throbbed against the pressure she brought to bear.

“Luna, stop,” Celestia gasped, and Luna felt the muscles in her sister's haunches strain as she resisted an urge to press harder into Luna's touch. But Luna didn't stop, and she felt Celestia's cock throbbing eagerly against her hoof. She moved it slowly, knowing her stroking was sending warm thrills shooting through Celestia's thighs.

A stray breeze came through the still-open door of the balcony and disturbed the papers on Celestia's desk, catching Luna's eye as it flipped the Manehattan paperwork aside to reveal a hoof-written manuscript beneath. She looked past Celestia's ears and picked it up with her magic before Celestia could realize what had happened.

“What's this?” Luna said, gazing at the text.

“Ah! Give it back!” Celestia cried. She wriggled from under Luna and tried to grab the pages back, but Luna kept them safe within her magical grip.

“Hmmm,” Luna said, brows furrowing as she read. “Though her nethers still tingled from the aftereffects of her struggles with the lustful guardian plants, Sunny Day bravely strode into the shadowy hall of the Night Queen. She would not fail in her quest. Neigh, she could not fail! For the fate of all Sexquestria lay upon her slim unicorn haunches.”

“Don't read it!” Celestia yelped. Her magic sparked against Luna's blue aura gripping the papers, but she could not wrest them back.

“'Sexquestria'? Sister, is this your hoofwriting? The Night Queen sat imperiously on her throne, her scathing gaze roaming the hall from beneath her beautiful long bangs. Her glossy black coat shone in the light of the hall's lanterns. 'Who dares disturb me?” she hissed. Sunny Day quailed as she saw the massive stallionhood draping down the throne between the Night Queen's thighs.”

“Give it back! Luna, give it back!”

Luna's thoughts raced. “The Night Queen has bangs? Is she supposed to be Twilight or me? I think I can guess who Sunny Day is.”

“They're nopony! They're original characters! It's fiction, now stop reading!”

Luna grinned and kept going. “'What are you doing here, pretty little unicorn?' The Night Queen flashed an imperious smile, her imperious fangs glinting whitely. Undeterred, the brave Sunny Day stood tall. “I have traveled far and braved many dangers to reach you, O Queen. I have ventured through the Tentacle Caves of Kwast, and I have been held captive by the Wild Wyvern tribes and forced to milk their stud-beasts with my bare hooves. I have endured the mystical vibrators of the Lost Ladies of Moo and I have crossed the Desert of Dreadness sustained only by the emissions of my faithful camel guide who spurted his last spurt that I might reach this place at last and beg of you a boon!'”

Luna snickered. “Very creative, sister. 'What boon do you seek, you foolish yet pleasing-to-the-eye mare?' The brave unicorn shouted out with all her heart 'I SEEK THE HOLY DILDO OF THE SUN!!!'”

Luna collapsed to the floor in a fit of laughter. “The Holy Dildo of the Sun? Really?”

Celestia stomped one hoof. “If you read from the start you'd understand what it's for!”

“Oh, I think I have an idea what it's for!”

“She already has the Sacred Dildo of the Moon.”

“Very commendable,” Luna giggled.

Celestia snorted in irritation. “What are you even doing here, Luna?”

Luna made a sudden thrust of magic at Celestia, clawing down the illusion spell. It dissipated with a shower of sparks, and revealed Celestia's cock, still thick and stiff beneath her belly. Luna admired the pink shaft from her position on the floor, and ground her thighs together lasciviously.

Celestia yelped. “What do you think you're doing?”

“Admiring the view,” Luna said. She got to her feet. “The question is, what do I think you're doing.”

Celestia shifted, trying to hide her erection from Luna's gaze. “Just... shoo!”

“I think you're still too self-conscious of that cock between your thighs, and you went and got scared when Twilight confessed to you, unless she didn't confess to you, in which case you got all mopey because she didn't confess to you and you're too scared to confess to anypony, and then you got horny thinking about it all and then you went and decided to write your clop-story so you could masturbate to it and stop thinking about romantic confessions.”

“LUNA!”

“That's what I think.”

“What you think is a complete fantasy,” Celestia huffed. “And your presence is not required.”

Luna threw her head back and laughed. “Oh sister, everything about you screams that you're in dire need of some stress relief. My presence is most definitely required.”

Celestia shook her head and backed up a step. But at the same time, her cock gave a thick twitch. “Stress relief” was a phrase between them, and it went back a long way. “Luna, no, we can't do things like that anymore.”

“Oh? Why not?”

“Because we're sisters, obviously?”

“Oooohhh... sisters, yes. How scandalous.” Luna yawned dramatically.

“Look, we were young and full of hormones, I understand. But in the modern world—”

“And you're not full of hormones now?” Luna said, looking pointedly at Celestia's throbbing member. It continued to stand, proudly rebellious beneath her belly. “I'm your sister, and I understand your body better than you give me credit for.”

Celestia glared.

Luna met her gaze for a long moment, then shrugged. “Fine, suit yourself. I'll just stay and read this fascinating piece of literature.” She rattled the sheets of paper with her magic.

“Don't feel obliged,” Celestia turned her back and sat down, sulking.

Luna found a random place in the story and began reading. “Sunny Day struggled in the naga's coils, twisting and gasping whenever the creature amused herself by flicking the tip of her tail across the unicorn's nethers.”

“Don't read out loud!” Celestia yelped. But Luna pushed onward relentlessly. The erotic adventures of Sunny Day were varied and frequent, and Luna found herself rather impressed with the character's stamina. Not to mention the enthusiastically detailed descriptions of sex. Luna could barely credit that such dirty passages had been put to paper by her sister.

To be honest, though she had only meant to tease her sister a bit, the story was having its effect on her as well. The account of Sunny Day's wrestling match with the zebra mare left her own pussy warm and damp, and the downright primal sequence in which Sunny Day saved herself by fucking a chimera until it passed out left distinctly wet trails running down Luna's thighs.

Celestia was not immune either. Luna smiled to herself as she glanced at her sister's back and saw her trying to be subtle, moving one wing in an effort to conceal that she was drawing a hoof along her cock.

But before long, she reached the Night Queen, and the manuscript abruptly cut off. Celestia had not written anything beyond that.

Luna pounced in front of Celestia, half intent on asking “What happens next?” and half intent on catching her sister with her hoof still on her cock.

“Oh my,” Luna said as her gaze settled between Celestia's thighs. She had thought to see Celestia's pink cock standing tall beneath one hoof, perhaps lightly glistening with the seepage of her pre, but the reality of her sister's arousal was startling. Her cock stood tall and throbbing, the head already flared thickly, veins standing out. And it was soaked. Thick trails of pre ran down the shaft and dripped from the heavy mass of her balls. Her hoof was similarly dripping, and a wet streak in the fur of her chest showed where she had even squirted a dollop of the stuff. The rich musk of Celestia's arousal filled Luna's nostrils.

Celestia froze, even as more pre bubbled from the tip of her cock.

“Well, what happens?” Luna breathed. “The Night Queen shows off her cock, doesn't she?”

Celestia let her hoof drop away from the shaft. “Y... yes. She makes... she makes Sunny Day kiss it.”

Luna leaned in and pressed her lips to the underside of her sister's cock. The pre coated her mouth and drizzled down her chin. The shaft pulsed against her. When she drew back, strands of it connected her mouth to it before they drew taut and snapped.

Celestia's cock twitched. Saliva filled Luna's mouth, and she kissed it again.

“The... the Night Queen makes her lick it too.”

Luna nuzzled down to Celestia's balls and pressed her nose into the warm orbs. She snorted up their thick scent and slid her tongue out to taste them. Her saliva spilled freely along the pink flesh. She licked in long, slow motions that savored every ripple of skin underneath her tongue, and she felt the slow churning of the sperm factories within her sister's balls. Celestia moaned, and her cock slapped up against her belly.

Luna reveled in the heft and weight of Celestia's balls, and their warm, intimate scent. But before long, she worked her tongue up past Celestia's sheath and onward to her cock. The thick taste of pre spilled through her mouth, and the shaft throbbed mightily under her touch. “Sunny Day has to lick it clean because it's so messy from the Night Queen's lustful drippings,” Luna said.

“Yessss!” Celestia moaned.

Luna's tongue worked further, climbing the shaft as she relentlessly scooped up the pre that spilled down it. She reached around and stroked, trapping the twitching cock between her hoof and lips.

“Sunny Day can't believe the state the Night Queen is in. Has the Night Queen never felt the caress of pony tongue on her cock?”

“Luna!” Celestia gasped as pony tongue reached the flared head of her cock. Luna kissed at the throbbing ridge of flesh and ran her tongue along it. Celestia's belly quivered as jolts of pleasure shot through her.

“The poor Night Queen,” Luna said, her words muffled against the hefty cock meat against her mouth. “Laid low by a mere unicorn.” She brought her head back down, angling to drag the smooth whorls of her horn along the tip of Celestia's cock. “She must be in agony.”

Celestia whimpered. Luna pulled away, trails of pre sliding down her horn to ooze across her forehead. “I bet the Night Queen loses her mind when Sunny Day does this.” She darted her muzzle to Celestia's flare, parted her lips, and sucked the throbbing shaft into her mouth.

Celestia shrieked, banging one hind hoof into the floor repeatedly as the sensation of Luna's mouth around her drove exquisite detonations of pleasure slamming through her. Luna felt the cock pounding mightily between her teeth, and the luscious taste of her sister filled her mouth.

For a moment Luna reveled in the intensity of her sister's reaction, simply holding her in her mouth and enjoying the wild pulses. But neither of them could be satisfied with that for long, and she drew her head up, and then back down, feeling the slide of taut muscle against her tongue and the needy shudders that wrenched through Celestia's body. Saliva filled what space in her mouth was not already occupied with her sister's cock, and spilled past her lips to roll freely down that shaft. Little spurts of pre spattered and coated her throat, and she swallowed down the sweet liquor eagerly.

Celestia's moans filled the air. She brought one hoof up to trace around Luna's ear. She was caught up in a delirium of pleasure, her hips tensing with each motion of Luna's mouth. Her balls stirred in their sack, slowly drawing tight between her thighs as the pressure to spew her seed grew.

Luna slurped and grunted, gobbling up the warm shaft with ardor. There was a strange delight in feeling Celestia's cock throbbing, in knowing her mouth was bringing such extremes of pleasure to her sister. In this moment Celestia's body was in thrall to her tongue, craving each slick motion, quivering with every thrust of her head. Each flick of her tongue or gentle suck intensified the haze of lust that filled Celestia's mind.

The lewd sounds of both sisters filled the room. Luna's head was buried between Celestia's thighs, juices spilling from her chin and running down Celestia's balls while the white alicorn shuddered and gasped in delightful torment. Her forehooves gripped Luna's head, and from time to time her body tensed up as particularly powerful rushes of ecstasy swept through her. In those moments she shoved Luna's head deep into her groin, battering the back of Luna's throat with her cock head and vocalizing a needy animal groan. Her coat had begun to shimmer with wet glossiness as sweat gathered.

Luna sensed the tension in her building to unbearable levels, the pleasure reaching the breaking point. Celestia's cock twitched and spasmed between Luna's teeth as the need to cum grew ferocious. Luna teased and tormented, doing her best to hold her sister suspended at the peak of her desperation. Celestia cried out Luna's name, begging as her hips tried to thrust and force her cock deeper. Her hooves would tighten and drive Luna's face onto her cock, and then lose their strength as a blinding wave of ecstasy surged through her.

As much as Luna loved swamping her senses in the smell and taste and feel of her sister's exquisite torment, she too felt an increasingly powerful desire taking control of her. Her tongue now craved the taste of Celestia's cum, her mouth eager to be filled with bursts of hot sperm. This fresh hunger took hold of her, and set her slurping with abandon.

Celestia's eyes rolled back, her muscles tensing and locking up as a massive spasm shook her. The already thick flare of her cockhead seemed to bulge even further. She howled, the extremity of her urgent need overwhelming her. Her cock kicked between Luna's lips once, twice, and then with the third her cum came blasting forth.

It shot into Luna's mouth, a thick, hot torrent that forced itself into her throat in an instant. Convulsively she swallowed, her mouth clenching around Celestia's cock even as it kicked again and spewed more sperm. Celestia's voice filled Luna's ears as she screamed out in the ecstasy of release. Her hooves shoved Luna down on her cock, forcing streams of cum to spray past Luna's lips and across her pulsing balls. Another surge came squirting up her shaft, and Luna managed to yank her head back, taking the rush of cum across her tongue instead of straight down her throat.

The raw taste of Celestia's semen filled her mouth and nearly sent her swooning. She swirled the hot slime around while her tongue still wrestled with the thickness of Celestia's shaft, savoring the lewd rankness of the flavor. Celestia had succumbed to the ecstasy of orgasm completely, her eyes rolling back as she let her cock spew without restraint, drool spilling from her lips as her body shook with the shockwaves of pleasure. Her cock painted the inside of Luna's mouth with steady eruptions of her cream.

Luna sucked at the stiff pole, delighting in the feel as each surge of sperm thrummed through her sister's meat and sprayed across her tongue. The obscene taste of her sister's cream set her own pussy to quivering wetly. She swallowed thickly as her mouth filled, loving the way the dense slime slid down her throat.

Gradually Celestia's cries faded to little whimpers and moans as her cock ceased to jet her semen. Luna drew back and released the cock from her lips sloppily, letting Celestia's mess spill across her chin and slide down the shaft. She looked up at her sister, a wicked smile playing across her lips.

Celestia panted, her body still reeling with the aftershocks of her orgasm. They held each others' gaze for a long moment.

Finally Celestia said, “S... Sunny Day should lick clean the Night Queen's cock. Sunny Day is a responsible mare who cleans up the messes she makes.”

Luna slipped her tongue from her mouth and gave a luxurious lick to the foam of cum and saliva that covered her muzzle. She smacked her lips. “Sunny Day thinks she's defeated the Night Queen. Sunny Day thinks she's exhausted the Night Queen's strength and can do what she likes.”

A spark flashed in Celestia's eye. “Sunny Day is making a terrible miscalculation if she thinks the Night Queen's lust is tamed so easily.”

Luna got to her feet. “The Night Queen is utterly spent. Sunny Day knows the skill of her lips can render any cock powerless.” She turned away, her tail hiking to one side, almost moving on its own to show off the slick and eager lips of her pussy. She felt a sudden trickle of her juices go spilling down the inside of one thigh before it dripped audibly to the floor. “Sunny Day will claim the Holy Dildo of the Sun while the Night Queen lies helpless.” Luna's own desire quivered through her body, and she felt her pussy wetly convulse into a wink, hungrily clutching for a cock to penetrate her.

She heard Celestia's hooves clatter as she heaved herself up. “Foalish creature!” Celestia growled. “Naive little pony!”

More quicky than Luna could have imagined, Celestia was upon her. One foreleg hooked over her rump and then she felt Celestia's muzzle settle between her thighs. Warm breath rushed across her pussy and anus and then paused as Celestia inhaled, snorting up the scent of Luna's sex.

“The Night Queen is not so easily defeated,” Celestia gasped. “She can smell your own filthy lusts, Sunny Day. Your body betrays you!”

“Never!” cried Luna, but a dizzying rush of pleasure shot through her as Celestia's tongue slid across the tender lips of her pussy.

Celestia gave a low “Mmmm...” as she tasted Luna. She mashed her muzzle against Luna's dripping slit, the juices spattering across her nostrils, and drove her tongue between the tense walls. Luna shook as hungry need pulsed through her. She quivered against Celestia's mouth, reveling in the hard pressure of her sister's muzzle shoving against her as the tongue probed ever deeper. A rush of her juices came spilling against Celestia's lips and teeth, surprising Luna with its sudden flow. She heard the splashes as it spilled past Celestia's chin and fell to the floor.

Celestia grunted bestially as she rooted into Luna's pussy, tongue lunging and twisting inside the shuddering passage. Luna shifted her haunches, spreading her hind legs to open herself further to her sister.

“Sunny Day will never surrender to your wicked tongue,” Luna gasped out. Her pussy pulsed against Celestia's mouth, and the relentless assault of her sister's tongue teased her with steadily building waves of pleasure.

But then Celestia pulled free, raising her head suddenly over Luna's haunches, flinging a strand of wetness across the lifted underside of Luna's tail and the puckered mound of her anus. “So be it, foalish one!” Celestia declared.

The white alicorn reared and grabbed at Luna's haunches, mounting her urgently. Luna's hooves slipped and scrambled to brace herself under her sister's weight, and another strand of her dripping juices was flung free to lash across her fetlock and hoof.

A rush of anticipation filled her. It had been far too long since her sister's weight had graced her back. The press of Celestia's body against her made her heart pound eagerly, and the feel of Celestia's front legs pawing at her sides as she mounted her sent little shivers of delight rocketing through her. Celestia's cock jabbed against the inside of one thigh, leaving a wet smear of the cum that still slicked it. She shifted position, and then Luna felt the flat head of it bang against the slathering lips of her pussy.

It twitched, spurting a little jet of pre across Luna's sex. Luna gasped, and felt her pussy flower into another eager wink against the warm head of Celestia's shaft. A jolting surge through her loins sent a spurt of her own juices spraying against the throbbing cock, as if to answer squirt with squirt.

Celestia snorted needily, then pushed forward in a sharp thrust.

Luna had meant to make some other proud and defiant comment for Sunny Day, but in the moment Celestia's cock ploughed into her, all thoughts crashed into confusion as pure sensation overtook her. The thickness of her sister's cock filled her pussy perfectly, sending shockwaves of ecstasy racing through her. It's warmth and hardness suffused her body with delight. In just that first thrust Luna found herself reintroduced to a paradise of pleasure she'd nearly forgotten.

Celestia too seemed momentarily overwhelmed, holding herself still, buried deeply in her sister. Luna felt her shiver on her back, a deep quake of pleasure slamming through her. Luna's own pussy quivered and clenched around the magnificent cock, her juices trickling in a steady flow, basting the slab of meat. Although her welcoming lubriciousness was hardly necessary given the cock was still slick with Celestia's cum and Luna's saliva.

Celestia's breath hitched, and then she began to move her hips and thrust in earnest.

The cock rubbed and slid inside Luna, each feature of its surface caressing perfectly the sensitive walls that held it. Were there ponies who dreamed of being fucked by the sun? But none could hope to be as wonderfully matched as she. Now she remembered how the stallions she had toyed with had never quite measured up, enjoyable as they had been. It had been over a thousand years since she and her sister had pleasured one another like this, and she had nearly forgotten how well the two of them fit together.

She could tell Celestia was feeling just as intense a sensation from her pussy, her cock throbbing and twitching in its wet embrace. Celestia grunted and snorted with almost every thrust, sharp bursts of ecstasy jolting through her thighs. Luna felt her mind swamped with pleasure, barely able to think as the sensations surged through her. But Celestia was already even further gone. Luna craned her head back to look at her sister's face, and saw glazed eyes as her sister's mind was lost to the storm of pleasure, her thoughts devoted only to the feel of Luna's pussy around her cock.

Already Luna could feel Celestia's cock flaring, the thickness moving deep inside her and sending answering detonations of pleasure through her. Her coat was growing damp with sweat, the powerful thrusts of Celestia's hips rocking her, the heat of Celestia's body radiating through her. Celestia dropped her head down, rubbing her muzzle against Luna's neck, licking at the sweat, taking in everything about Luna's body, drowning herself in the touch and smell and taste of her sister. She was rutting her like a beast, almost mindlessly possessed by the need to fuck, her body acting at the sole command of the shaft beneath her belly; yet at the same time every moment was focused wholly and utterly upon Luna.

Luna was caught on wave after wave of sensation, her sister's cock a relentless pleasure between her thighs that carried her higher and higher. With every quiver and convulsion of her pussy sparks of ecstasy shot through her. She panted, loving the feel of Celestia writhing atop her, the meaty slam of hip against her rump, the constant drizzling spurts of pre being massaged into her pussy's walls. Had they been fucking a minute? an hour? a day? She did not know, nor care; she only wanted the incredible feelings to keep her body tense with a delicious agony for another thrust, and another.

And for a time the two ponies did soar together through the endless skies of mutual delight, each of them borne up on the physical joy they brought the other. But this nirvana of fleshly pleasure could not go on forever, and Luna began to feel a deeper need burning within her, the stirring of her body's primal drives for even greater ecstasy. Celestia too seemed to be shifting into a state of higher desperation, her smooth thrusts degenerating into rough shoves and uneven hunches on Luna's back. Celestia strained, wheezing and snorting, little half-whinnies escaping her throat as her cock throbbed, held at an unendurable limit by Luna's devouring pussy. She clutched at Luna, both of them slick with sweat, their bodies pressed tight together in a heat both physical and sexual.

The steely shaft of Celestia's cock plunged between Luna's thighs. Every nerve of her pussy was ablaze with pleasure, on the edge of exploding into even more glorious sensations. She craved release, craved orgasm as never before. Her pussy clenched down on Celestia's cock, demanding her seed, the rich proof of Celestia's ecstasy she craved to bring her own pleasure to its ultimate fruition. Her juices painted Celestia's cock, spilling from her pussy with each thrust. And Celestia was in dire straits herself. Her hips trembled and strained, her cock shoving into Luna, sharply kicking with the force of her lust.

Some ragged shred of awareness, tossed about in the storm of her carnal excess, lodged in her mind long enough for her to cry out Luna's name as she slammed into her sister with particular force, burying her cock as deep as she could. “Yes!” Luna answered, feeling her own pussy surge to the brink of ultimate ecstasy.

Celestia's cock gave a mighty jump in the clasp of Luna's walls. Then Luna felt it, the powerful gush of Celestia's sperm shooting deep inside her. Celestia's cock rumbled and shot forth a torrential stream of her cum, and Luna felt her own pussy spasm as raw ecstasy exploded through her.

She screamed in pleasure, her pussy clamping down on her sister's glorious cock as she came. Her juices surged and spilled out, electric eruptions bursting throughout her pussy. Celestia too was howling in ecstasy, her voice harmonizing with Luna's in an obscene duet. Celestia's hot cream poured into her, the sensation magnifying the power of her orgasm. Celestia resumed pumping her hips, slamming her cock into Luna, steeped in her own explosive joy. Her cock kicked and shot another massive jet of cum, the surge of it rushing along Luna's walls and sending her into fresh spasms of ecstasy. Each spurt of Celestia's sperm made Luna shake, her pleasure peaking again and again. Her pussy filled quickly, so forceful and voluminous were Celestia's ejaculations, and before long the white cream was spurting out of her around Celestia's thickness. Hot surges of sperm spilled down the insides of Luna's thighs, running down her legs while Celestia pressed against her and poured out even more. Celestia's thrusts and the spurts of semen kept Luna's pussy constantly erupting in spasms of pleasure, until she was barely coherent, swooning and overwhelmed with the intensity of her and her sister's pleasure.

She was scarcely conscious by the time Celestia's cock was sated at last. Her own body was aglow in a haze of warm bliss. She could barely stand, but she was indescribably happy and content.

Afterward, they lay nestled together on a couch, Celestia's head resting against Luna's chest as Luna stroked her sister's neck. “I suppose Sunny Day got the worst of it after all,” Luna said.

“Oh no,” Celestia murmured, “after a fuck like that, the Night Queen is sure to reward her with the Holy Dildo of the Sun.”

“Well. Good for Sunny Day, I suppose. Who is totally not you.”

Celestia raised her head. “Why would you think she's me?”

“Um, white pony? Named 'Sunny Day.' You aren't being subtle. What's her cutie mark?”

“A scoop of lemon sorbet, rising over the horizon like a sun. But you're completely mistaken, Luna. She's a unicorn, not an alicorn. There are plenty of white unicorns. Twilight's friend Rarity, for example.”

“The name, sister. She's clearly a self-insert character.”

“Don't be silly. 'Sunny Day' is a pun on 'sundae,' which relates to both her cutie mark and her dream of inventing an ice cream made from stallion sperm.”

Luna's jaw hung open. What, really, could one say to that? “Well,” she said at last, “you're lucky it was me who found your embarrassing story and not somepony who might spread it around. I suppose there's nothing wrong with writing as a hobby, but you might want to be careful with such subject matter.”

Celestia cocked her head. “Well... but to be honest, Luna, I've already published four Sexquestria books.”

Luna stared at Celestia.

“I publish under a pen name of course. 'Midnight Hipthrust.' My editor at Velvet Stable Books says the series has been selling quite well. Which is why they want volume five as soon as possible, which is in turn why I may have seemed preoccupied lately.” She poked Luna in the chest lightly. “Thank you for helping me out with a spot of writer's block, though. I think I've got the confrontation with the Night Queen all worked out now.”

Luna swallowed. “Oh,” she said at last.

Celestia snuggled into her. “Mind you, I could still use some help with what happens when Sunny Day brings the Dildo of the Sun and the Dildo of the Moon to the fearsome Mistress of the Toys.”

Luna gulped. “Oh...” she said.