Princess Celestia's Stiffest Wingboner

by GaryOak

Rating: mature
Tags: Original Character, My Little Pony: Friendship is Magic, Comedy, Romance, Porn, Sex, Princess Celestia
Length: 7713

[F/F] Not even Princess Celestia is above wing priapism: a wingboner so stiff, it renders one unable to fly—and extremely horny. When Equestria's esteemed ruler is afflicted by a severe case, she calls upon the only pony who cure her.

Not even Princess Celestia is above wing priapism: a wingboner so stiff, it renders one unable to fly—and incredibly horny. When Equestria's esteemed ruler is afflicted by a severe case, she calls upon the Canterlot Medical School's top graduating sexual health specialist to provide the cure she so desperately needs.

[F/F]

This story is a birthday present for the wonderful lady, Miss v-invidia, aka Devious Derpy.

Edited by Horse Voice.

For those interested, here are some pictures of Doctor Panacea!

Pic 1, Pic 2, Pic 3.

Published 2013-07-26 20:50:02 UTC
Last updated 2013-07-26 20:50:02 UTC

Intensive Sexual Therapy

Celestia, Princess of Equestria and owner of the prettiest, most majestic wingspan in all the land, sat in the middle of a large, white lily. Or rather, a large, white, flower-shaped dollop of cake frosting. She craned her neck forward and inhaled a lungful of succulent, sugary goodness before she stuck out her tongue and lapped up a small morsel. Delicious. She had given her young disciple, Twilight Sparkle, the day off studies just so she could have this moment.

Celestia rolled her eyes in bliss as her taste buds ignited with unabated joy. Unable to restrain herself any longer, she plunged her entire muzzle into the icing petal in front of her, devouring the melt-in-your-mouth frosting as fast as she could swallow. She ate and ate until all the icing before her had been consumed. Her tongue darted out and licked her lips clean.

“Mmm... I must bask in this delicacy's full splendor before I inflict too much damage.” With a delighted whinny, Celestia stood up and took flight. Damaged flower aside, the gargantuan dessert stood pristine upon a bed of cloud. The lily she had sat on was only one of a dozen that ringed the top, surrounding an icing pattern that matched her mane's colours. Her cutie mark was emblazoned on the centre.

A long strand of drool hung from Celestia's lower lip. “I think that is long enough.” By curving her wings, she allowed herself to glide down toward the middle of the frosting sun. Her hooves sank a few inches before coming to rest on what was most likely the cake itself. She bent down and began to graze. Lemon-flavoured frosting flooded her mouth, making her hum with contentment.

Celestia swished her tail back and forth as she continued to eat. She did not stop munching downward until her long muzzle had penetrated the surface and met the cake itself. After briefly coming up for air, she dove back in and took her first bite of soft, velvety cake. It was light and fluffy, and each crumb burst with more flavours than she cared to name, but not overwhelmingly so.

Several more large mouthfuls were sentenced to an express trip down her gullet before she started to expand the pockmark she had created. She was utterly lost in the ecstasy fueled by the cake of her dreams. Every time she took a bite, a thousand more just like it awaited her. After she took her biggest bite yet, she abandoned all pretenses of regal elegance and collapsed, madly stuffing hoof-fulls of cake and frosting into her gaping mouth. The more she ate, the faster her next mouthful came, until—

“Happy two-thousand, four-hundred, and seventy-eighth birthday... sister!”

A starry, dark-blue mist wrapped around Celestia's neck and yanked, forcing her flat on her back. In a shower of pastry, Nightmare Moon burst forth from the hole Celestia had created. In addition to her gleaming, light-blue armour, she was clad in skintight leather that encompassed most of her torso and went almost all the way up her slender legs.

“I have heard of ponies coming out of birthday cakes as a special surprise, but this is ridiculous,” Celestia spluttered, struggling to stand back up.

But Nightmare Moon's forehooves, planted firmly on Celestia's chest, pressed her into the icing and prevented her from moving. “For nearly a thousand years, you have sat upon Equestria's throne alone, whilst I languished inside the moon, the very symbol of my power!” She reared her head up and snorted. “You have heinously wronged me, dear sister, and for that, you must be punished.”

Desperate to fight back, Celestia reached for her magic, but not even a spark came to her aid. “What—what is happening?”

Nightmare tossed her head back and laughed. “I see my enchanted cake has taken full effect. Excellent. You will find yourself incapable of levitating so much as a tea cup, much less overpowering me for several hours. You are all mine.”

Celestia gulped. “What did you have in mind?”

Nightmare only smiled as a fragment of her mane split off and formed into a titanic, spangling dildo. It sported more girth than the thickest part of Celestia's leg and was at least two feet long.

Celestia's eyes bulged at the sight of it. “H-how did you...?”

“Oh, please.” Nightmare rolled her eyes. “I have been imprisoned, all alone, for over nine hundred years! I have my needs, too. Oh, and upon my return, I shall build a bigger harem than the one I had before.”

Rendered utterly helpless, Celestia ceased struggling. A sensation began to build in her nethers. It started as a mere tingle, but as she continued to stare at the enchanted equine ecstasy equipment, it transformed into a burning ache that could only be sated by the object hovering some two feet above her.

Nightmare licked her lips. “Yes... you want this, don't you?” Celestia nodded mechanically. “But first...” She brought her right forehoof to her mouth and sucked on it for a few seconds. When she was satisfied, she withdrew it and moved it to her marehood.

The sight of the twisted aberration that was her sister pleasuring herself brought her mare honey to a roil. Her eyes darted between her sister and the magical toy, and she bit her lip. “Please...”

“You will have your turn.” Nightmare withdrew her forehoof and placed it just out of reach of Celestia's tongue. “I have plans. Big plans.” She looked at the dildo, which she slowly drew close to her. “See, I'm sure you could easily take the whole thing, but that would mean you were in control of it. I gave this divine rod of punishment two ends for a reason.” Her wings snapped open with a loud pomf! “A very good reason.”

The titanic toy traveled to Nightmare's waiting pussy, and the desire bubbling in Celestia's nethers amplified tenfold. The dildo's tip brushed against Nightmare's kissing pussy lips. Nightmare gave a loud, guttural moan as she slid the magic member into her eager nethers. When about half of it—roughly a foot—was buried deep inside her, she manipulated the exposed half, bending it until it was parallel with her body.

Looking like she sported a dick of her own, Nightmare panted and aligned it with Celestia's begging vagina. “Prepare yourself,” she said huskily, “I'm going in dry.” The moment the last word left her mouth, she plunged the entire thing into Celestia in one mighty thrust. Her hips slapped audibly against Celestia's shapely flank, and Celestia's body squelched in the frosting.

Pure pleasure exploded within Celestia, quickly reaching unbearable levels. She climaxed on the spot, clenching the toy with the grip of a fully grown dragon clasping the greatest treasures in Equestria. She closed her eyes and moaned loudly, and her fluids pooled in front of her in a steady torrent, creating a sweet and fishy-smelling mixture with the cake icing. “Sister... punish me! Oh, give me everything I deserve, and more! I have been a bad Princess...”

Once Celestia's orgasm had abated, Nightmare pulled her hips back, withdrawing the dildo until only the tip remained inside her sister. “Yes you have.” In one motion too fast for Celestia to follow, she lunged forward, kissing her fiercely and hilting herself again, bringing about a fresh orgasm.

Celestia writhed her tongue with a skill that was legend among those lucky enough to lie with her. She bucked her hips against Nightmare, humping the toy as best she could while firmly trapped underneath her younger sibling. Sweet, sugary cake frosting matted her coat. Something about the dildo gave Celestia a type of pleasure she had never felt in her tens of thousands of sexual encounters. She had certainly been with stallions significantly larger, some even doubly so, but the fibres of the yielding, yet supple shaft themselves sent mind-blowing stimulation signals to every nerve ending she had.

What Celestia had experienced was only the warm-up for Nightmare; before long, night's dark harbinger pounded her in her bed of birthday cake with a force that would put many of Equestria's greatest studs to shame. The powerful pony pile-driving was so intense, she found herself almost buried in icing. She had never before been so helpless, so dominated, or in such a never-ending string of orgasms.

Nightmare withdrew the dildo and absorbed it back into her mane. “Now for the next phase of your punishment.”

Although Nightmare had relieved any hold she had over Celestia, she could do little more than quiver from the aftershocks of the mating she had received. “W-what is it, sister?”

Nightmare narrowed her eyes. “You will address me as Mistress!”

“Y-yes, Mistress.”

“Good.” Nightmare smirked. She wrapped her magic around Celestia, holding her upright in midair. She paused a moment to lick some icing off Celestia's coat. Another fragment of her mane split off and formed into a whip. Without warning, she drew it back and cracked it against Celestia's flank with enough force to elicit a loud scream of both pleasure and pain from her. “Did you enjoy that?”

Celestia nodded. “Ungh... another... Mistress... please. Another!”

“Music to my ears.” The whip cracked again. Nightmare flogged Celestia for what felt like hours, unwilling to stop until Celestia had grown hoarse from screaming and her flank was beet-red. “My my, somepony has incredible resilience.” She allowed Celestia to land flat on her belly before sitting in front of her. She pointed to her winking, dripping marehood. “You are to eat me out until I am sated. Then, if I am feeling generous, you shall be penetrated by my royal horn.”

“T-thank you, Mistress.” Celestia gently placed her forehooves on Nightmare's godly flank. After licking her lips, she leaned in to take the first of many tastes of her sister's snatch. She stuck out her tongue—

“Your Highness! Your Highness! Are you okay?” bellowed a Royal Guard, shaking the prone Celestia awake. “You were screaming and shouting! Are you harmed?”

A loud grunt escaped Celestia's throat. “I am now.”

The Guard stumbled backward. “Your Majesty?”

Celestia groaned. Her bedsheets lay in a tangled mess halfway down her torso, concealing the large pool of her sumptuous sovereign sex sludge that her aching pussy had produced. “You interrupted the best dream I have had in centuries.”

The clacking of hooves on the tile of Celestia's bedchamber floor signaled the Guard's continued retreat. “Sincerest apologies, your Highness.”

“It cannot be helped.” Celestia heaved a sigh. An almost painful sensation caught her attention. She sat up and looked first at her right wing, then her left. They stood rigidly at attention. “Oh dear...” She ran a hoof along each one. They felt diamond-hard. “It would appear that thanks to your... 'diligence,' I have contracted a severe case of wing priapism. A shame; if I would have been allowed to finish, this might not have happened.” She had unconsciously started to maresturbate with a forehoof while she spoke. “It cannot be helped, I suppose. If somepony was trying to assassinate me, you arrived in the nick of time.”

The Guard snapped to attention. He had nearly sidled all the way back to the door. “You will require assistance, then. Shall I fetch Captain Shining Armour, your Majesty?” he said in the gruffest voice he could manage. But it was not loud enough to drown out the sloshing and squelching of Celestia rigorously pleasuring herself.

Celestia thought to her recently promoted Captain of the Royal Guard. He was young enough to be barely of legal age, his stallionhood was one of the most impressive specimens she had had between her legs in some time, and his youthful stamina guaranteed a fantastic lay, but she thought better of it. For this, she desired a pony with real expertise. “No. As much as I look forward to sharing another night with him, this calls for special treatment. Bring me the Canterlot Medical School's top graduating student who specializes in sexual health.”

The Guard tossed a crisp salute. “At once!” He turned to leave.

“Before you go...”

“Yes?”

In a flurry of magic, Celestia procured a scroll and quill, and hastily sketched the enchanted dildo she had been rutted with in her dreams, as well as a list of specifications for it. “Take this to the finest 'Ladies' Entertainment' establishment in the kingdom. It is to be created and brought to these bedchambers with the utmost of haste.” She rolled up the scroll and tucked it behind the Guard's ear. “Oh, and your poner is showing. You may wish to take care of yourself before you go galloping through the castle.”

The blushing Guard tried to cover his fully erect member as he sidled out the door and slammed it behind him.

With a giggle, Celestia pleasured herself harder, bucking her hips against her rapidly swirling forehoof. “Ngh... Aah!” She had been in this situation many times before, and while she could begin to relieve herself immediately, she knew it felt so much better to wait for the perfect time—in this case, the arrival of the young medical student. But such powerful arousal could not be ignored completely. “Ooh... just... just a bit... unf... more!” She bit her lip and lost herself in the throes of stimulation.

* * *

Celestia had lost track of time, and still she pleasured herself. When one hoof grew tired, she switched to the other, sometimes even using both. All she knew was she had not climaxed since her dream. A large portion of her bed was completely soaked, and all she smelled was her own royal musk. “Oh, if I had known it would have been this long, I might have allowed that Guard to whet my appetite...” She shuddered as her wings throbbed.

A knock came at the door.

“Enter.”

The door inched open soundlessly. A young and exceptionally attractive earth pony mare wearing a brand-new-looking white lab coat stepped inside. Two spear-wielding unicorn Guards flanked the mare, who had a rich, creamy coat and a medium-length purple mane that matched her deep purple eyes. She knelt as soon as she had cleared the doorway. “Your royal Princessness, it is a great pleasure to be in your hallowed presence!”

Celestia eyed her up and down. The light pink eyeshadow was a nice touch. “You are the Canterlot Medical School's top graduate student? Tell me, young mare, what is your name?”

Still kneeling, the young doctor raised her head just enough to meet Celestia's gaze. “Ohs yes. My professors assured me that I haves top grades. I am Panacea, but I ams no Doctor yet; the school's presentation ceremony is next week.”

Celestia withdrew the soaked hoof she had been plunging in and out of her royal snatch and gave it a long suck. Once she was sure all of her nectar had been consumed, she took it out and licked her lips. “Delicious. Where was I? Oh, yes. Your accent is... unusual. You are from the far north, I presume?”

Panacea nodded. “I ams. It is so very cold above the Crystal Mountains, and my village is so very poor. My parents spent their life savings to send me to Canterlot Medical School, and are over the moon now that I am about to graduate. Once I haves practiced medicine for long enough, I shall pay for them to move to the city I work in.”

In the absence of her hooves, Celestia had to resort to rubbing her hungry nether lips against the mattress. “Come here, Doctor Panacea.” Panacea rose to her full height, approached the bed, and laid her forehooves atop it. “Good.” Celestia leaned close and licked Panacea's snout. “This will be your final test for your Medical Degree.”

Panacea shuddered from Celestia's touch. “'Final test,' your Grace? Ohs, but I haves already passed the ones in school.”

“Because you are this year's greatest student, I have decreed that another challenge awaits you. Should you pass, I will personally present your MD as well as arrange a train and lodging for your parents, free of charge.”

Panacea's eyes grew as wide as dinner plates. “Ohs! Ohs! Thank you! Thank you!” She ravishingly kissed Celestia's forehoof between words. “I don't knows what to say! Your generosity exceeds your reputation, which is so renowned! What is your task, o' magnificent pony?”

Celestia gave her right wing a quick nibble. “Wing priapism.”

“Wing priapism is serious business!” Panacea brought her forehooves to her muzzle. “Yes, I see it. That also explains the exquisite scent filling my nostrils. Hrms, this is a bit awkward...”

Celestia wrapped her forelegs around Panacea's torso, drawing her in closer. “What is, my dear Doctor?”

Panacea's creamy cheeks went a shade of bright pink. “Um... sexual release is the only known cure for wing priapism. I ams working on a manual invention, but it is not done yet, and it only works for stallions.”

“I know.” Celestia nuzzled against Panacea, making her blush deepen. “This invention sounds fascinating. What does it do?”

“One affixes it to one's equipment,” said Panacea, in the most business-like voice she could muster given the circumstances. “It is an enchanted glass cylindrical case with a pump on the other end. When used, the pump will create greater stimulation than sexual interhorse, allowing the user to attain relief quickly. But determining the right enchantments is difficult, given that I ams an earth pony.”

“I see.” Celestia began undoing Panacea's lab coat buttons with her magic. “You must bring me the schematics to your invention. I can envision your penis pump being quite successful, given proper funding.”

Panacea's jaw dropped. Her eyes watered and she hugged Celestia tightly, muttering indiscernible thank-yous and rubbing her head against Celestia's neck. “Oh pony, Equestria is so fortunate to have a Princess like you on the throne!”

“It's the least I can do.” Celestia's wings gave another painful throb. “Now, we must get down to business. This wingboner will not cure itself.” She looked up at the Guards standing in the doorway. “You two, fetch a bucket of our finest ice cream and a bunch of bananas. Deposit them on the bed and leave us afterward.” The Guards saluted and left the two mares alone in the bedchamber. She released Panacea from her embrace. “Good. Now, take off that coat, Doctor! Let me be your patient.”

Panacea blushed again. “Yous seem to have already done half that job for me!” She gave a coy titter. “But if yous insist... When the Princess of Equestria wants me to disrobe, who am I to refuse?” She stood on her hind legs, allowing her lab coat to slip off. It lay in a crumpled heap at her hind hooves, revealing her curvy, slender body. A stethoscope was emblazoned on each of her shapely flanks, and a trail of her filly fluid ran glistening down her leg. “Does the patient find this to her liking?”

A small gush of pony love juice fled Celestia's marehood. “Oh my, what a marvelous figure you have. I did not think they made them like that anymore.”

“Naws, yous!” Panacea looked down and traced a hind hoof on the floor. “Not nearly as lovely and perfect as yours.”

Celestia licked her lips. “I am sorely tempted to fashion a toy out of magic and have you pleasure me with it.”

Panacea shook her head.

“Is there a problem?” Celestia cocked an eyebrow. “Does this not please you?”

“Ohs...” Panacea cleared her throat. “I can think of many ways to satisfy a Celestia in heat, but I do not think magic dildos are the answer. I haves many practices for this, and I cannot rely on magic, because the majority of my patients will be pegasi.” She bit her lip. “But do not worry! There is a special prescription in store for you, my Princess!”

“Very well... Just one word of warning...” Celestia purred.

Panacea cocked her head. “Ohs? What?”

“When I play Doctor... I play to win!” In a move so sudden that it made Panacea whinny in surprise, Celestia tucked one foreleg around her back and the other under her hind legs, sweeping her off her hooves. She gazed into Panacea's beautiful eyes with longing, then kissed her fiercely. As her tongue entered Panacea's mouth, she allowed herself to fall on her back.

Panacea moaned and lay atop Celestia. Her tongue danced with a precise skill that caught Celestia off guard. Celestia hummed and ran her forehooves along Panacea's incredible body, deepening their kiss. Driven by a torrent of powerful hormones that were at long last being satisfied, Celestia thrashed her tongue in Panacea's mouth.

Rather than attempting to match Celestia's fervour, Panacea moved her tongue in her own way with just as much passion as her partner. Celestia moaned and grabbed Panacea's perfect pretty pony posterior. She had never met somepony who kissed quite like she did. Panacea advanced a forehoof into Celestia's hungry honey pot, which devoured it eagerly.

The new stimulation sent waves of pleasure rippling up Celestia's body and crashing into her brain. She grinded against Panacea's hoof, taking as much as she could while she reciprocated Panacea's gesture. Panacea's cooch was wonderfully tight, and it clamped Celestia's hoof in a vise-grip that refused to let go.

Celestia admired the exceptional strength and control of Panacea's mighty maregina muscles as she wiggled her forehoof inside it; the natural lubrication it provided gave her just enough movement. A familiar pressure built in her nethers when Panacea found her g-spot. But she could not cum just yet. It would be humiliating to allow herself and her thousands of years of experience to be outdone by a barely legal mare.

Resist as she might, Celestia knew she could not hold on for much longer. Panacea's expert and seemingly tireless tongue writhed in her mouth in unexpected ways, filling her with a youthful thrill that she had not experienced in far too long. Not only was Panacea exceptionally gifted at what she did, but her unpredictability left Celestia guessing. Would she wrap her tongue around hers? Would she suck on her tongue? Would she probe the deepest and most remote recesses of her mouth? Or would she do something else entirely?

Celestia could only do her best to keep up—a task she could manage, thanks to her super-heightened arousal and experience. She began spanking Panacea with her free hoof. A satisfying thwack filled the air each time her hoof hit Panacea's perfectly conditioned flank. After the seventh or eighth spanking, she felt Panacea's almost airtight love tunnel clamp her hoof even harder as she came. She had done it. She had outlasted the young Doctor, with the evidence of such an achievement soaking her foreleg.

With that, it finally became too much for Celestia. She gave a shudder so violent, she thought it rocked the whole bed, and the dam burst. She moaned long and loud into Panacea's muzzle and came. Her walls clenched as tightly as they could, and her nerves sent a plethora of pure pony pleasure to her brain as she felt sweet, sweet release. Not allowing herself to lose focus, she continued lapping against Panacea's tongue with her own, as well as stimulating the Doctor's climaxing marehood. Eventually, both mares' horsegasms ebbed out, and they broke their kiss, laying on the bed, panting.

“Your ice cream, my lady.”

Celestia's eyes shot open. A Guard stood in front of the door, and a tray laden with ice cream and bananas sat by him. He was sporting a massive erection. “Guard, how long have you been standing there?”

The Guard moved a foreleg in front of his stallionhood, but failed to cover it completely. “Uh... long enough, your Majesty.”

Panacea lay atop Celestia, giggling quietly and basking in the afterglow.

Celestia narrowed her eyes. “And you did not inform me when you arrived?”

“I didn't want to interrupt.”

“And you did not simply leave the tray at the foot of the bed?”

“I... I didn't want you to miss it.”

Celestia crooked a foreleg around Panacea and stroked her mane. “I think I could have spotted something like that.”

The Guard sheepishly slid the tray toward the bed. “I'm sorry... I... could I...?”

“Oh, very well. You may clop in the corner. But aim for the bucket beside the hearth!”

The Guard gave a delighted snort and galloped to the fireplace, hiding in the shadows.

“Ohs!” Panacea sat up and eyed the heaping bowl of vanilla ice cream drizzled in chocolate sauce. “Ice creams! Ice creams!” She clapped her forehooves together like a delighted filly. “Ice creams are my favourite food! Oh yes yes! It is so delicious, I sometimes consume entire tubs while I study for long hours.”

“Good.” Celestia spread her legs. “Tell me, have you ever had a banana split?”

Panacea frowned. “Oh, noes. I am unfamiliar with such an item.”

A wry grin spread across Celestia's muzzle. “Do you like bananas?”

Panacea tried to look thoughtful, but could not stop staring at Celestia's exposed royal treasure. “Ums... they are all right. I do so prefer chocolate and ice cream, for they are the best foods in Equestria! Best combined.”

“Works for me.” Golden light shimmered around a banana, peeling it. Celestia cleft it in half lengthwise and placed the halves on the sides of her winking, dripping pussy. She grinned as Panacea watched in open-mouthed fascination. Next, she placed three large scoops of ice cream between the bananas, directly on her marehood. She bit her lip as intense waves of cold shot through her. “Your banana split is served.”

Panacea rolled off the bed, landing flat on her back. It took her nearly a minute to stand back up and compose herself. “Y-your Highness?”

“Eat. This particular banana split comes with a... special sauce.” Celestia gestured at her crotch with the air of a sous chef presenting his finest masterpiece. “Put that talented tongue of yours to work!”

“My my, the patient is quite naughty.” Panacea waggled a forehoof at Celestia. “Shame on yous! Very well, you leaves me with no other choice, but remember, you may be the almightys ruler of Equestria, but for now, you are my patient, and you must do as I say!”

Celestia groaned. Her orgasm had been extraordinary, but she was far from close to being sated, as her rigid wings reminded her. “Eat. Me. Out. Now.”

Panacea gulped. “Yes, yes, your Majesty! At once!” Lightning fast, she dove in, devouring the ice cream at an alarming rate. The contrasting sensations of the frigid ice cream and the warmth of Panacea's rapidly moving mouth and tongue kicked Celestia's pleasure back into overdrive. She did not know how, but Panacea managed to pleasure her, licking and slurping at her foal garden, and eat the ice cream at the same time.

Celestia noticed Panacea mostly used her snout to stimulate her while she chewed, ensuring there was no gap in Celestia's ecstasy. “Ooh, Doctor, you are even more incredible at cleaning the royal rug than you are at kissing!” She placed her forehooves on Panacea's head, forcing her deeper into her marehood. “Don't stop!”

Panacea placed her forehooves on Celestia's flank, fondling them as she ate her out. Once Panacea had finished her dessert, she found Celestia's g-spot again in a matter of seconds, ruthlessly lashing her tongue against it as she continued to move her muzzle.

“Ooh!” Celestia involuntarily tensed up. “Ungh... you... you will make me cum if you do that.”

This only caused Panacea to grip Celestia's flanks harder and lap up Celestia's fluids as quickly as she could produce them. Celestia's chest heaved as her breathing became ragged. She tried to hold back, but Panacea was simply too competent at cunnilingus. Panacea's slurping grew louder, and Celestia felt herself on the razor's edge of orgasm.

“Ooh, Doctor, Doctor!” Celestia wrapped her hind legs around Panacea, pulling her closer. “Aah! Where did you learn to lick like that?” Delicate moans punctuated every word. Panacea's only response was to nuzzle against Celestia's constricting, clenching cunny. “Unf, Doctor! I am—I think I am—I am going to—WHINNY!”

Celestia's most powerful climax yet sent her fluids gushing forth. She thrust and grinded her hips into Panacea's eagerly slurping muzzle as she lost all control over her body. Celestia could not stop crying out and whinnying, thrashing and convulsing, while the lovely Doctor Panacea stroked and squeezed her gorgeous flank and ate her out dutifully.

After nearly a full minute, Celestia relaxed her muscles. Everything except her wings. She lay on her back, panting like an exhausted puppy. Panacea finally came up for air, licked her muzzle, and rested her head on Celestia's belly. “Doctor... that was positively divine. I must speak with the head of the sexual health department, for you are quite the model student.”

Panacea embraced Celestia and caressed her pure white coat, which was now matted with sweat. “Noes, I ams just doing my job. It is easy to perform in bed when one's partner is a goddess! I merely demonstrate the love everypony has for your rulership.”

“My... you are sweet,” Celestia cooed. “Do not be surprised if I call on you again once you have begun practicing; this is not my first chronic wingboner, and it certainly will not be my last.” She returned Panacea's hug, feeling her up while she did so. Those curves were just too perfect to resist. She knew of many fine model and escort mares in Canterlot who would be envious of such a body. “Did you enjoy your banana split?”

Panacea gave a delighted snort. “I did do!”

Celestia exhaled deeply. She had only been resting a short while, but her body had already begun sending her sharp signals that it was time for another round with the Doctor. And judging from the unbridled passion Panacea previously presented, there would be no complaints.

“Your Royal Highness, your package has arrived.”

“Gah!” Celestia sprang upright. The other Guard had returned, clutching a long, slender box. He also carried an enormous hard-on. “Can't a filly horse around in peace?”

“But, your Majesty, you requested this package!”

Panacea chuckled. “Which one? Ohs, I do hope it's the box. His penis looks like a fine specimen, but I do nots like threesomes! It is just a big sex pile with no feelings, only hump.”

“The box.” Celestia reared her head up and snorted.

The Guard's ears drooped as he set the box down. “Um... your Highness, may I—?”

“Fine!” Celestia pulled the box beside her and began opening it. “You may clop in the corner too. Just—”

“Aim for the bucket?”

“Yes.”

The Guard's ears perked up. He whinnied and sprinted to the other corner by the fireplace.

“Ohs, what's in the box?” Panacea eyed it quizzically as the strings and wrapping paper holding it together were shed by Celestia's magic.

“Something I had designed just today.” The final layers of packaging were removed, revealing an enormous black dildo. It had to be at least two feet long and wider than either of their forelegs. A realistic cock head crowned each end.

Panacea's eyes bulged. “But that is so huge!”

“So perfect.” Celestia gave it a test bend. It formed a perfect U-shape before she straightened it out again. “Excellent. As you can see, it is designed for shared usage.”

Both mares ran their forehooves along it and gave it experimental squeezes. “I could use this equipment.” Panacea blushed when she noticed Celestia's broad grin. “Strictly for medical purposes! Yes, medical purposes. To help cure wing priapism. For science! Yay!”

Celestia laughed and booped Panacea on the snout. “You can have two.” Panacea smiled, and Celestia continued feeling up the toy. It was exactly as she had hoped. Large, realistic veins ran along it, making it look for all the world like an over-blessed stallion standing at full attention. It was soft and yielding, almost to the point of being spongy, yet possessed a hardness sufficient to make any mare penetrated by it scream Celestia's name. “Yes... it is exactly like I saw it in my dream...”

“You dreamed of this?” Panacea nuzzled against the dildo. “My my, how pervy! To think that the Princess of Equestria dreams of such things. Um... can I try it? For experimental reasons, of course. We must make sure it works!”

Celestia stood up and placed the toy's tip by her ever-hungry marehood. “Me first.”

“Ohs, but Princess, you mustn't be the first to try such a thing! What if there is something wrong with it?” Panacea grasped the toy, trying to direct it toward her own pussy, but it would not budge.

“I'm sure it's just fine.” In one quick thrust, Celestia slid over half the fake horse cock inside her. She gasped; it felt divine. Her flanks quivered as her pussy tried to come to terms with the titanic tool buried inside it. She propped the toy's free end against the bed and began humping and bucking it, taking in a little more each time. “Aah! Ooh! So good!”

Panacea gawked at the erotic spectacle before her, and humped her own forehoof. The sight of such a beautiful filly maresturbating to Celestia's sexual efforts spurred her to greater speeds. She rapidly bounced up and down on the dildo, but pleasure easily overrode the exertion-induced burning sensation in her legs.

By the time twenty inches were buried inside Celestia, long, guttural moans and grunts constantly came from her throat. She was so full, well beyond the capacity of the average mare. She finally slowed her pace, and resorted to gently humping the last few inches of the phony pony phallus. “Come here, Doctor.” She lowered her head and beckoned.

“What is it, your Highness?”

“Unf... suck on my horn.” Celestia lowered her head further, until her horn tip was right by Panacea's muzzle.

“Princess?”

“Just... just do it.”

“Okays.” Panacea closed her eyes and danced her tongue along the tip. She carefully licked at the tiny, sprialing grooves that ran along it.

Celestia whimpered. “Stop teasing!” She heard Panacea giggle, then felt her mouth close around her horn. “Aah! That's much more like it.” With the dildo bottomed out inside her, Celestia erected a thin magical forcefield around her horn to prevent it from accidentally harming Panacea. The two-pronged stimulation sent shivers running through Celestia. Panacea sucked hard and loud as she took inch after inch of the impressive piece of ivory down her throat.

As Panacea neared the base of the horn, Celestia grabbed Panacea's flank. While fondling it, she directed it toward her drooling mouth. She snaked her tongue out and teased the moist lips, eliciting a muffled moan. She continued to grind on the dildo while submerging her muzzle deep in Panacea's honey pot. This time, the Doctor's moan was much louder.

Celestia grinned. Panacea clenched her so tightly that she must have been teetering on the brink of climaxing for quite some time. Knowing she did not have much time, Celestia licked for all she was worth. Panacea's nectar was sweet on her tongue, boasting an unfamiliar flavour. The taste alone was enough to drive Celestia to lap up every drop she could while she searched for Panacea's g-spot.

Both mares trembled violently as they fought in vain to stave off horsegasm. Who would break first, was the only question that remained. Celestia's tongue probed as far as it could, and Panacea shuddered as if she had just been jolted. Celestia grinned and continued licking there, while she banged herself hard with the dildo. Finally, Panacea bottomed out and came.

The sudden onrush of that delectable horse honey, combined with being stuffed with two feet of fake cock and her entire horn being sucked was too much for Celestia. She whinnied into Panacea's pussy as pleasure exploded in her brain, paralyzing her from its intensity. Her maregina grabbed the dildo with incredible force as her juices leaked onto the bed.

Celestia collapsed, heaving, and allowed the dildo to slide a few inches from her nethers. She helped Panacea free herself from the horn and curl up next to her. “I hereby decree this toy a success.” She gave Panacea a quick peck on the lips. “You may try it at your leisure.”

“Thanks you, but...” Panacea's ears drooped slightly.

“What is it, my good Doctor?”

“I ams just sad that it is over.” Panacea rubbed her snout against Celestia's neck. “Yous have always been my idol, and you are everything I hoped for and more, but—”

Celestia hugged Panacea tightly. “Oh, but my dear, I am not finished yet. My wings remain hard as ever. Take as much of the toy as you can, and then we can share it like it was meant to be.”

Panacea squealed and leapt toward the exposed dildo tip like a hungry mosquito on a sanguine victim. She clasped the dildo while presenting Celestia with a perfect view of her winking marehood. She wiggled the toy, withdrawing inch after soaked inch from Celestia's gorgeous pussy, kissing it as she worked. “You really can take a lot of shaft!”

“I am significantly larger than other mares, and I have been with some enormous stallions in my time.” Celestia played with Panacea's eager pussy lips, making sure to only tease her. The dildo's other head left her marehood with a loud pop.

Panacea ran her tongue along it, savouring the peachy residue left behind. “I... I do not think I can takes all of this. The average stallion is just over a foot, and this is easily double that, not to mention its girth! I do not think I have seen a stallion so thick!”

“I have.” Celestia winked. “Just try your best and take as much as you can. But do not hurt yourself; watching you handle such a large piece of equipment is making me exceptionally... excited.”

Panacea gave a delighted snort and plunged about eight inches into her mouth. Celestia giggled at the sight of such a petite mare attempting to deep throat so much cock. Panacea fit a few more inches in before she spluttered and took it out. Strands of her saliva dripped from it. “Okays, all lubed up!” She spat on a forehoof, rubbed it on her marehood, and then pushed the head in.

Despite its unignorable girth, it popped in rather easily; both Panacea's pussy and the dildo were so wet and slippery, she could make it fit. “Aah! This feels so good!” She whinnied and groaned as she allowed the toy to impale her. It looked to Celestia as if she was being split in two, but Panacea rocked her gorgeous hips until she had absorbed half of it. “Unf... normally I can take it easier than this, but such thickness requires adjustment.”

Celestia smiled and rubbed Panacea's back. “Keep it up. You are doing just fine.”

Panacea's tongue lolled as she nodded weakly, taking more of the dildo. Her progress had slowed considerably, but she continued to take inch after inch. Eventually, her hips stopped moving. She rocked up and down several times, but the remaining seven or so inches would not enter. “Oohs! I think I am at my limit!”

Celestia licked her lips and gave the toy an experimental wiggle. She could not squeeze any more of it in. “Yes, yes you have. Seventeen inches is nothing to be ashamed of. Now, do you feel broken-in enough?” Panacea nodded. “Excellent.” She grabbed onto the dildo and gently tugged on it until about a foot lay exposed. “Hold still.”

Thanks to Celestia's guidance, Panacea lay flat on her back, with the toy sticking straight up. Celestia stood over top of her, with the tip brushing against her moist mare mating lips. She gazed into Panacea's beautiful eyes for a moment before lowering herself onto it.

“Ooh! It feels even better the second time!” In a matter of seconds, her rump connected with Panacea's. Her pussy muscles clenched the dildo, and she leaned forward until her muzzle was an inch from Panacea's ear. “I hope you are ready, because I have been feeling rather pent-up. You had better give as good as you get.”

Celestia raised herself back up again, but thanks to her iron grip on the toy, it rose with her, as if it was a phallus of her own. She took a deep breath and kissed Panacea while she drove downward. With her hind hooves firmly planted, she thrust, hard and fast, while her tongue tangoed with Panacea's.

Though Celestia's humping was sudden, hard, and relentless, Panacea wrapped her forehooves around her lover and caressed her wings, sending ripples of pleasure through Celestia. It was not long before Panacea adapted to Celestia's rhythm, and bucked her hips against Celestia's in time with each thrust. Their moans mixed together as they mated with unprecedented fervor.

Celestia admired Panacea's resilience. She had been pounding away for at least five minutes, and Panacea had matched her thrust for thrust, despite her pile-driving being hard enough to violently shake the large bed. She closed her eyes and envisioned the scene she was a part of: Her standing over a gorgeous, but much smaller mare, hammering away with a foot of immensely thick fake cock.

The thought only fueled her to drive harder and faster. They broke their kiss when they grew too exhausted to move their tongues; all of their available energy was directed into Celestia's rough, wild ride. Celestia gritted her teeth and grunted. Her orgasm was fast approaching, and it was going to be huge. “Yes... yes! Take it! Take it all!” She growled. “Moan for your Princess!”

In a display of strength that caught Celestia completely by surprise, Panacea lunged forward, tackling Celestia onto her back. “Nows it is your turn to moan, my Princess!” She planted her forehooves on Celestia's chest and bounced her flank up and down, creating a loud, arousing slap each time their flanks met. “Yous have been a naughty patient! Be a good pony and take your prescription... all of your prescription! Doctor's orders!”

Something snapped within Celestia's head. She rested her forehooves on Panacea's flanks and watched her bounce up and down, pushing her closer and closer to her limit. She, Princess Celestia, a sex goddess of a mare with literally thousands of times the experience of anypony else in bed, was being dominated by a passionate young Doctor of only about twenty years of age. And she was enjoying every horse-humping minute of it.

Celestia's tongue lolled out of her mouth as Panacea rode her like a champion. She grinded and bucked her hips against Panacea, but her stamina quickly faded as her orgasm drew dangerously close. Panacea's strength began to fail as well, for she soon abandoned her full thrusts and resorted to small humps while kissing every inch of Celestia's neck she could find.

“Oh... Doctor... I think... I think...”

“You're... going to cum?”

“Yes,” Celestia panted.

Legs shaking, Panacea stood up. “Then release, my patient. Release, my Princess! Yous have earned it.” She bent down, kissed Celestia, and thrust hard.

And both mares came.

Joy, exhaustion, exhilaration, ecstasy, and relief all flooded through Celestia in a crescendo that culminated in her maregina discharging her fluids onto Panacea's hips, while Panacea did the same. Both their tongues danced around passionately in each other's mouths, and they grinded their flanks together in small thrusts as they rode their horsegasms all the way to cloud nine.

Rather than petering out, Celestia's mind-shattering orgasm only grew stronger and stronger, making her eyes roll madly in their sockets, as all she could do was hold on for dear life as her climax threatened to overwhelm her. She wrapped her legs around Panacea as her pussy at last communicated its gratitude and satisfaction to her brain. When her nerves felt like they would shut down from over-stimulation, she finally came down.

Celestia lay heaving on her back, unable to move a muscle. Her limbs rested at her sides, and her wings had finally retracted into a folded position. An out-of-breath Panacea lay atop her, with the toy still firmly lodged inside their pussies, connecting the two lovers.

Panacea stirred. “I... I see the patient's condition is cured. The procedure has been a success!” She mustered barely enough strength to stand up, remove the dildo from herself, and roll off Celestia.

“I would most certainly agree.” Celestia groaned and removed the dildo from her nethers with her magic, laying it beside the bed. “You are certainly an expert in your profession. When I am feeling up to it tomorrow, we shall peruse the hospital directories to see which one could most benefit from your services. Unfortunately, you are not a pegasus, so Cloudsdale is out of the question.” She wrapped Panacea in her wing.

“Noes. We can't have me falling out of the clouds.” Panacea snuggled against Celestia, an exhausted, dopey grin on her face.

“A pity... you could have been the Wonderbolts' personal wing priapism specialist. In any case, I will not hesitate to refer you to them. Once we have selected a city, I will personally sign your degree and arrange for you to live there.” Celestia sighed contentedly. She glanced first at the interhorse toy, in all its massive, pony love juice-slicked glory, and then at her wing, beneath which Doctor Panacea lay. Her eyes fluttered shut, and she hummed a peaceful lullaby.

Celestia heard two loud whinnies coupled with the sounds of strong jets of liquid hitting metal. The two Guards had blown their loads and had hit the bucket, just as she commanded.

* * *

“And that is how I got my Medical Degree! Oh yes yes!” Panacea bounced up and down on the hospital bed, clapping her forehooves.

“That... is so awesome!” Rainbow Dash's jaw fell open, and her wings stood firmly at attention.

Panacea glanced at the gathering pool of rainbow juice and the erect wings. She licked her lips and hopped off the bed to retrieve the dildo Celestia had given her all those years ago. “Oh dear. It looks like somepony is going into relapse!”