“Princess please, this is totally inappropriate!” yelped Rarity in a startled plea, as she tried to pull away from the grasp of Celestia’s glistening hoof cups that had rudely latched on to her flustered flanks. The smaller unicorn unable to do so, as she felt her eye-catching rump come to a rest upon the princess of the sun’s warm lap, as Rarity tried to worm away from the unwanted intimacy. The larger alicorn spooning with her squirming subject as the flailing fashionista’s hips slotted neatly between Celestia’s cake thickened thighs unable to do much more than jiggle gently upon the greeting groin. The dab of Celestia’s moist marehood upon her rump causing a shiver to shoot up Rarity’s spine as the damsel in distress let out a distraught whine, that was more a primal sound of fear than the articulate tones her couth tongue was known for.

“Princess I will scream, think of the scandal….” meeped Rarity, as she continued to weakly wriggle to escape the snare of the sun, unable to muster a more compelling argument other than the threat of a shrill shriek. The seamstress scared to act in any way other than verbally attempting to dissuade the hooves firmly grasping her waist like a possessive lover. The unicorn’s instincts screaming for her to thrash her refined body and flee, but Rarity’s meticulous mind had the sense not to strike the living goddess, lest the alicorn punish such a transgression in kind with her millennia-honed magic. The mature mare already robbing the younger unicorn of her magic with a simple waft of her ivory wand, leaving Rarity in dread of what the alicorn might manifest if provoked by a silly slap brought on by the struggle.

“Do so if you wish, though my stately rooms are soundproofed, so it will be a pointless endeavour on your part,” replied Celestia calmly, as the alicorn seemed to relish the look of defeat that sparkled in Rarity’s ocean blue eyes at the realization that no one was coming. The Lady beginning to hyperventilate as she renewed her struggles with slightly more vigour to a chorus of effeminate grunts and whines. The alabaster alicorn not the least bit bothered by her guests panicked vocalizations, as she was confident that the guards at the door would hear what was to come next.

“Please…. Let me go… I won’t tell anypony,” pleaded Rarity, the socialite shuddering as her normally confident voice snagged in her svelte throat leaving the mare feeling rather faint with the terrifying turn of events. The mare seemingly shellshocked, the refined equine unable to cope as the veil of society was torn from her eyes with a single golden gilded yank. The unicorn lured in with misplaced trust and the promise of an appointment to make measurements for a gala dress. The fashionista getting butterflies in her belly at such a prestigious offer, and the boost to her boutique was simply too much to resist, and Rarity had leapt at such an honour in a heartbeat. That giddy rhythm soon replaced by panicked pounding as no sooner had the mahogany doors shut behind her were her aspirations for tailoring for royalty were quashed as the ruse was dropped and Celestia pounced upon her hapless subject to live out her nefarious ambitions.

“Celestia, please…. I will do anything….”

“Please… we can... we can pretend this never happened,” grovelled Rarity as she desperately ran her mouth hoping any of her words might land and get her out of this hellish situation. Celestia ignoring the jibbering as she manipulated the mare like a doll, lining up Rarity’s agitated anus with the princesses own plump pussy as if hinting at the deviant defilement the ageing alicorn might have planned. The plump ponut pinching against Celestia’s clit, as if it were kissing the engorged pearl with each clench of Rarity’s close to convulsing core.
The feminine folds already moist as they crackled lightly upon Rarity’s haunches leaving a musky glazing as Celestia made a few minor adjustments as the wink of the velvety ring smooched her sensitive slit.

“Please…. I promise I won’t tell anyone!” practically screamed Rarity as her frantic mantra grew more desperate as the dire nature of the situation began to sink in. Rarity trying to pull away with a particularly powerful thrust only to feel Celestia’s hoof snake over her shoulder and pull her back into her not so loving embrace as the mare was returned to the flustering fold.

“No you won’t, in fact when I am done there will be nothing left of you,” replied Celestia sinisterly before her horn lit up with a gentle twinkle causing Rarity to recoil in a cringe expecting a magical blast to rend her body asunder for her lack of compliance. Rarity closing her eyes, trembling in anticipation for the inevitable the zap of magic to course through her system to punish her for her misbehaviour. The magical hum growing in intensity, before a sudden buzz bounced down Rarity’s nerves with a numb thrumming as the spell dissipated into the unicorn’s trembling body. The unicorn whimpering pitifully as her tears mixed with her now messy mascara, irritating her eyes until they glowed with a bloodshot hue. Celestia cradling her struggling subject, almost with a veneer of compassion as if some latent maternal instinct was surfacing in the menacing matriarch. A golden hoof cup coming to Rarity’s chin, its cold caress directing the cowering unicorn’s head to tilt gently backwards, so Celestia could get a good look at feeble female she was cuddling.

“What.... What did you d…. Do?” sputtered Rarity through a quivering lip, as she reluctantly opened her stinging eyes to see a smiling Celestia leering over her like a vulture. The view distorted by misty eyes, as a numbness swept through Rarity’s body as if a cold snap had blown through her bowels.

“Just a forgotten spell that will make you part of something greater,” said Celestia cryptically as she ran her frog over Rarity’s cheek as if to soothe her struggles. Rarity only shooting Celestia a repulsed look as the colour left the unicorn’s pale cheeks as she was aghast at her uncivilised treatment. The mare’s dock coming down as if it might cover her perched private parts only for the small nub to become stuck in Celestia’s suddenly sticky flesh.

“Don’t look so sad, many would be envious of the intimacy with their beloved princess you are about to receive in the short time before I expend you of your worth,” she continued, as a surprised look seeped onto Rarity’s face as a queer tingling overtook her lower body. The unicorn trying to pull her rump away only to find resistance as if her pelvis was affixed with irritating glue as unbeknownst to Rarity her body was being rapidly repurposed to the whims of Celestia’s spell. The stimuli of her hips and buttocks melting as the pliable flesh was forced to conform to Celestia’s groin making Rarity’s hips buck involuntarily as the nerves were rerouted to Celestia’s body in a gradual cascade. The atrophy brought on by such a loss of control forcing Rarity’s hind legs to Celestia’s crotch as the unicorn began to uncontrollably curl up as if she had been punched in the gut. The mare feeling her back frogs touch Celestia’s warm fur before with little resistance they sank into the hot flesh like it was melting butter. The gradual process continuing as more and more of Rarity’s beach-ready figure sank into the accommodating flesh as the alicorn began to assimilate the jerking jetsetter. The persistent throbbing seeming to increase in pace as Rarity felt a hot flush flow through her worming body as she could not quite comprehend what was overtaking her curvaceous rear end. The only thing she could understand was that with each throb she sank a little further into the tingling embrace of Celestia’s all too welcoming tissues. The absorbing assault leaving Rarity gagging screaming mewls as she was lost for words as her body began to conform to Celestia’s overreaching demands.

The itching spreading as Rarity felt her intestines straightening, the pinch of her stomach tightening following soon after as a phantom pain ran through her bowels before silencing as she lost feeling in her lower piping and had only an echo in the surrounding nerve clusters before they too were silenced. The mare oblivious to the true severity of the situation as her innards merging perfectly with Celestia’s own marauding morphology as cell by cell the unicorn was moulded like plasticine as Rarity's DNA unwound and was replaced by the alicorn's pervading presence. Her cutie mark emblazoned plot sinking slightly as her lower body began to assume the base of a shaft and a pair of beefy bollocks, that already glistened with sweat from the exertion of metabolizing a mare into a phallic implement. The elastin in Rarity’s body betraying her as she began to recoil like a wilting flower drawing her forelegs to her barrel as if she were wracked with stomach-ache. The joints locking in tandem with the back legs deforming, before with a satisfying crack the legs were pulled upwards and inwards leaving Rarity hugging her heaving breast.

Rarity panicking as the back hooves and legs slowly lost their form and welded into Celestia’s burgeoning ballsack. The bones decalcifying and melting like ice in summer as the disintegrating limbs amplifying Celestia’s growing masculinity as the unicorn’s biomass was reassembled into a pair of meaty gonads. Rarity’s rapidly shrinking forelegs following suit as they melded with her barrel as the toned limbs were lost in the pulsating sausage of flesh her torso was transforming into. Rarity reaching down with her left hoof as she pawed at her loins in one last feeble attempt to pull herself off Celestia only to find that she and Celestia were no longer two separate beings as the alicorn was well on her way to absorbing her. The mare’s hoof rapidly fusing with the shifting skin that had once been her trim stomach as she felt the leg sink into her palpitating torso.

The feeling of the appendage painlessly fading into nothingness stuffing Rarity into a stupor as there was no way for her to correctly comprehend the alien sensation wracking her rapidly shrinking body. Rarity was frozen in the fearful stillness of her overwhelmed body, the mare twitching against her own volition, before with a sudden jolt she began to violently convulse in a metronomic fashion like a struggling caterpillar. The mare losing control of her body as a burning sensation seemed to spark to life across her entire form as Rarity began to throb in an uncontrolled fashion. The feeling frightening as Rarity felt as though she might explode as her entire body tensed up in a series of crunching contractions. The feeling queer as though it was terrifying it was underpinned with a tinge of perverted pleasure as though her compromised body was trying to eke out one last thrill before subjecting herself to being a part of the alicorn’s anatomy.

The mare’s retching screams morphing into moans as Rarity felt the fusing motion move north forming a medial ring just above the curve of her hips. The mare dancing to the beat of Celestia’s excited heart, as the rosy faced alicorn bordered on orgasm. The peak crowning in an instant when Rarity opened her mouth to let out a loud moan only for a rapid rush of cum to violently erupt from her yawning mouth and nose in a white wave. The hit of dopamine forcing Celestia to let out a snickering snort as she experienced her first nutt in almost a century as her body ejected Rarity’s unneeded biomass in a few salty squirts.

Each scrotal sneeze going off in rapid succession as in a few seconds several gallons of seed had formed a puddle on the marble floor. Rarity vomiting up her own expended body as she gagged and gargled as the whitewash sprayed forth. The mare trembling as Celestia caught up in the excitement let go of her surging shaft allowing Rarity to fall forward still spraying gunky gametes as her contorting face came to rest in a pool of steamy spunk that moments earlier had been her internal organs. The mare worming as a symphony of satisfied sighs rang through the air as Celestia found release from all the pent-up emotions of the royal court. Rarity’s eyes pleading now her agape mouth was filled by the testicular tide powerless to prevent her body slowly shifting to a might horse cock.

The feeling of her mane flowing backwards to join with her tail, the migration like pins and needles dancing down Rarity’s writhing back as the royal purple joined the mobius like pubic bush that had sprouted upon Celestia’s groin. The mare’s swivelling ears following in short fashion as they sank into her skull robbing the mare of her hearing as she gargled away to the thick soup that oozed from her still wafting lips in a continuous stream of bubbling ball batter. Thick veins and bulging blood vessels forming on Rarity’s abdomen, forming a checkered pattern that intertwined across the mewling mare body up to her slender neck distorting the mare’s hide with each fidget of Celestia’s aroused loins. Rarity feeling the moment her racing heart abruptly stopped as the pump melted into nothingness, leaving the unicorn with the feeling of Celestia’s blood circulating through what remained of her circulatory system her in lieu of her own. The mare’s intestines replaced with nothing but a significantly shorter urethra that was aggressively pumping semen through Rarity’s entire being like a rubber hose as each eruption forcibly expanding her haggard throat. The unicorn’s moans and screams fading away to a dull silence as her muscles and organs were melted out from within her as her larynx dissolved into little more than spongey phallus meat and jism like the rest of her rapidly diminishing presence. Even the sharp features of her face flattening and her cheeks swelled as her beautiful muzzle was erased into nothing more than the dulling tip of a nodding stallionhood. The mare's horn holding resolute for a time, before just like her more pliable characteristics it too capitulated and began to retract into her undulating body.

The visage of rarity’s face slowly sinking into the giant glans that had once been her head, as the mare was barely recognizable as an equine at this point. Rarity reduced to little more than an ejaculate spewing organ dangling betwixt Celestia’s leg. The unicorn’s sapphire eyes looking out desperately as her nostrils closed over as the lungs that required them had long since ceased to exist rendering the paired holes redundant. A similar process taking place in her crumbling skull as the mare’s grey matter was simmering into little more than expendable stallion sauce. The grotesque pony penis hybrid giving a few more convulsions before Rarity’s teary eyes blinked one last time and the fearful peppers fused shut leaving just the remnants of her glamourous makeup as evidence they had ever existed as the gateway to the soul sealed forever. Celestia giving a few more tenses as concluded her orgasm ejected one last load of creamy cum as any lingering vestige of Rarity’s facial features was washed away from the gargantuan groin cannon she had become.

Celestia breathing heavily as she watched her dilating urethra ease closed as she grew flaccid ending Rarity’s silent scream. The alicorn teasing the tip with her hoof cup as she wiped away the lingering eyeliner, before letting out a concluding sigh she enjoyed the feeling of her shaft slinking back to its sheathe now that it was no longer needed. The alicorn inspecting her mare cock with curiosity, getting one last look at Rarity’s cutie mark and luxurious mane that still graced Celestia's undercarriage with its glossy curls hinting at the departed mare’s persisting presence. The sight soon fading though as with a wobble of her horn and a small spell the remnants faded away and it was as if Rarity had never existed at all leaving just a chalk coloured cock nestled neatly below her more feminine parts. The mare completely replaced by Celestia’s more virulent biology, leaving the powerful princess to bask in the glory of her newly acquired sceptre as the afterglow crept in.

The princess rising from herself indulgent mess stumbling slightly, before finding her regal grace as her body calmed after the sexual storm. Celestia’s swan-like body caked in sweat from the exhausting exertion of taking a full-grown mare, but the results were more than satisfying as Rarity’s lingering weight rested gently between her thighs as little more than a fully converted extension of the princess’s body. The confident and up and coming unicorn reduced to nothing more than a length of sensitive meat to be used for nothing more than a few carnal excursions before her biomass was expended and then Celestia would need to find another surrogate shaft……

...........................

It seems Celestia was in need of Rarity's help, though I doubt the fashionista thought that well she was measuring up the princess for a dress the alicorn was measuring the unicorn up for a permanent position upon her groin.

A fun commission/gift for a friend that I got from my good friend  plaguetyranno who was taking a few commissions so I was fast to toss some brass her way.

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