Trial and Error

by Some Leech

Rating: mature
Tags: Princess Celestia, Sex, Twilight Sparkle, Anthro, Profanity, My Little Pony: Friendship is Magic, Romance, Porn, Fetish, Comedy
Length: 8238

Twilight and Celestia, having been a clandestine item for some time, decide to broaden their amorous horizons...

Though it's a well-guarded secret to everyone, Twilight and Celestia's relationship took a more-than-friendly turn after the aspiring unicorn graduated and moved off to Ponyville. With their secret love life thriving, enjoying what little time they have with one another, the passionate pair seek to dip their toes into kinkier affairs...

Kinks Include: Futa on Female, Female on Futa, Bondage, Teasing, Edging, Oral, Vaginal, Spanking, Dirty Talk, and Regal Ruttings

Artwork by DareDemon7000
The art is part of a Twilight Art pack with contributions from: @Aer0Zer0Ri2k, @sasaasaasa, @CanaryPrimaryOP, @ColdBloodedTwi, @DDemon7000, @ELewdfurs, @_TON618_, @Parumpi, @rirurirue, @SelenophileNSFW, @Snudd2, @wiz_slime, @Weloost, @Ebonyglow_ If you're interested in the pack, hit up Aer0's twitter!

If you want to help support me, I have a Tip-Jar/Patreon HERE

Published 2023-03-29 20:20:06 UTC
Last updated 2023-03-29 20:20:06 UTC

Bottom

Having successfully gotten past the castle’s guards, greeting them and brushing away their fanfare for her instrumental role in Princess Luna’s defeat, Twilight slipped down a side passage and deeper into the keep. To say she was elated would be an understatement of profound proportions. She’d successfully started a new life in Ponyville, reunited the Elements of Harmony, and vanquished Nightmare Moon, yet those accomplishments felt small in comparison to her greatest achievement - she had a marefriend.

It was hard for her to recall a time in her life when Celestia hadn’t been a motivational factor for her. The alicorn had taught her since she was a filly, being as much of a parent as either Night Light or Twilight Velvet, yet her view on the Princess had changed over the years. As she’d blossomed into adulthood, earning her former mentor’s respect, her true feelings for the Princess had done nothing but grow stronger. It was only after she’d reunited the sisters that she confessed how she felt about the alicorn who’d won her heart.

She’d expected things to go poorly, for Celestia to let her down softly and tell her that there was no way they could be an item, yet she’d been wrong - so terribly, wondrously wrong. The Princess had listened to her heartfelt admission, smiling softly all the while, until the most incredible thing happened. Instead of dejection, the alicorn had embraced her, given her a small kiss, and admitted that the feelings she’d secreted were mutual.

Glancing over her shoulder, ensuring she wasn’t being watched, she depressed a concealed panel within the wall and opened a trap door. The castle’s maze-work of hidden tunnels and escape routes had been designed in the event of an enemy attack, but they worked marvelously for all manner of clandestine purposes. Though she and Celestia had been an item for months on end, having shared several intimate experiences with one another while their bond grew, such affairs had to be handled delicately.

It was anypony’s guess as to how the public would react to the oldest, most influential Princess in the land taking her protege as a lover, so Celestia and herself had decided to keep things under wraps for the time being - sure it was inconvenient at times, but the taboo of their circumstances added an exotic spice to their time together. As she strolled down a spiral staircase, the gloom of the underkeep illuminated by her horn, her heart began to race.

While it wasn’t difficult for Celestia to disguise herself, the nature of this particular meeting demanded the utmost secrecy. There wasn’t much they hadn’t done with one another, both in or out of the bedroom, although there was something she’d always wanted to try. Though each bout of lovemaking with her mate was beyond reproach, always leaving her fully satisfied, they’d yet to try anything too kinky - that was until tonight.

She paused as she entered a hidden, subterranean chamber, channeled power into her horn, and ignited several crystals set in the walls. What had been an unused dungeon cell had been converted into something spectacularly depraved. The chains, implements, and furniture which were intended to deal with ne’er-do-wells would now be put to a far more erotic use.

Cocking her head, hearing the sound of footfalls approaching behind her, she smirked and reached for her top. Celestia was bigger and more powerful than her, so it only made sense that she take the lead for their first experimental bout of BDSM. Flitting to the center of the room, kicking her shoes to the side, she reached behind herself to unzip her dress.

“Is that you, Twilight?” a familiar voice called, sending an excited shiver up her spine.

“I…I’m down here, M…Mistress,” she sputtered, hastily unclasping her bra.

Neither she nor Celestia had any experience whatsoever with more exotic amorous practices, both being novices with all things carnal, yet that was far from a bad thing - in fact, it was a boon. Unsure of exactly what the Princess had planned for her, imagining all sorts of amorous torment, she stripped down and excited awaited the appearance of her lover.

As Celestia stepped into the chamber, her heart skipped a beat - that was until she noticed what the Princess was wearing. She’d fully expected attire that evoked feelings of arousal and dread, black leather and chains, yet her paramour was wearing anything but. Adorned in a pair of shorts and simple t-shirt, the towering alicorn looked over at her with a playful smile.

Looking around, seeing no garments save for her own, Twilight scrunched her snout. “I…I thought you’d…”

“Thought I’d what?” Celestia inquired, cocking her head while peering down at her crotch.

She hung her head and sighed. Though she loved Celestia with all her heart, it wasn’t that shocking to discover that her lover hadn’t come dressed for the occasion. Telling herself that the choice of clothing didn’t matter in the grand scheme of things, she lifted her head and peered over at the alicorn’s groin.

The fabric over Celestia’s crotch tented, speaking to the monster that lurked beneath the fabric. It was a well known fact that alicorns held traits of all pony races, yet she would never have fathomed how true that was. On the night she’d discovered her lover had the biggest, thickest stallionhood she’d ever seen, she was as surprised as she was thrilled.

“S…so…” she falteringly continued, tearing her eyes off the Princess’ bulge to glance over at the myriad of equipment around herself, “did you have anything particular in mind.”

Looking from one device to the next, Celestia thoughtfully rubbed her chin. “Honestly, I’m not sure. Do you have a preference?”

The question left Twilight gobsmacked and nearly caused her jaw to hit the floor. Her big-dicked she-stud being dressed for a casual date was one thing, but this was on an entirely different level of negligence. Celestia was supposed to be the one calling the shots, tying her up and mercilessly toying with her - not asking her what she’d like to do! Waving to a stockade beside her, she silently prayed that it would only take a little push to bring out her lover’s domineering side.

“Let’s start with this one,” she politely intoned, opening the contraption.

Leaning forward, she placed her neck and wrists in the device before using her magic to close its upper half. While she had perilously few nits to pick about Celestia, the biggest was that the Princess was startlingly submissive - something she had every intention of changing. With the sorcerous might to level cities, the physical strength to overpower dragons, and a stallionhood that would put any stud to shame, the alicorn should have been an absolute demon in the sack - unfortunately for her, it always took a bit of goading to provoke her mate into being even the slightest bit rough.

Celestia crossed the room and slipped out of her top, allowing her bounteous bosoms to spring free, before stopping just before her. “Is it not uncomfortable?”

“It’s…” Twilight stopped herself, moments from giving a very glib reply. “It’s fine. So what do you have in mind for me, Mistress? Are you going to lock me here and -”

“Goodness no!” Celestia gasped, wiggling her hips and drawing her shorts down. “Why would I want to lock you in that dreadful thing?”

Had it not been for the sight of the Princess titanic cock flopping free in front of her, Twilight would have expressed her discontent. Simply gazing upon her lover’s endowment was enough to dull her frustrations. Nearly as thick as her wrist and as long as her forearm, covered in velvety grey flesh, Celestia’s royal scepter bordered on the divine - even if it had taken a lot of time, patience, and sore mornings to get used to the size of it.

Celestia grinned as she strutted behind her. “I must admit, you’re quite provocative like this…”

“Y…yeah?” Twilight gulped, trying and failing to look back. “Why would you - Eeep!”

Silencing her with a soft spank to the rear, Celestia giggled. “Who’s my naughty little mare?”

Just like that, with those simple words, Twilight’s tail flagged. “I…I’m your n…naughty little mare!” she bleated.

Feeling herself starting to wink, she expectantly spread her legs. This was it, this was what she’d been waiting for, and she was dying to see what sort of punishments she was in store for. Unable to see what was going on, hearing the Princess shift, she sharply inhaled something warm and soft crept up her thigh. She braced herself, fully anticipating lilting words or possibly even another smack, yet she got neither.

“Allow me to warm you up,” Celestia cooed.

Before she could protest, the Princess dove in and began lapping at her nethers. As annoying as it was not to be harried, she couldn’t complain - literally couldn’t complain. Stifling a whimper, she rolled her hips back. If her lover wanted to start things off with a bit of edging, getting them both worked up, that was alright in her book; as long as things took a decidedly more intense turn at some point, everything would be just fine.

All things considered, she really didn’t have much to complain about. She couldn’t move her arms or head, the most glorious she-stud in existence was enthusiastically eating her out, and they had the entire night ahead of them. With a trail of nectar creeping down her leg from her slavering pussy, her eyelids fluttered.

On and on Celestia went, alternating from licking her clit to probing her depths. Her breaths grew heavy, her nipples rock-hard, and a drool beaded on her chin. It wasn’t until a singular warmth started to well in her abdomen, heralding her impending release, did she shake free from her impassioned stupor. If things didn’t come to a halt very, very quickly, the Princess was going to get a baptism of her orgasmic juices.

Forcing her treacherous body to comply, she squirmed and gently kicked back with one leg. “W…wait!”

Celestia paused and slowly, almost begrudgingly withdrew. “Is…is something wrong?”

“Yes something’s wrong!” Twilight harrumphed. “You’re supposed to be dominating me!”

Rising to her full height, the Princess stepped to the side and into view. “Are you not enjoying yourself?”

Peering up at her lover, seeing Celestia’s crestfallen expression, Twilight took a deep breath to soothe her tattered nerves. “Yes - yes, I’m enjoying myself, but that’s the problem ~ remember? We didn’t go to all the trouble of cleaning this place up just so we could get frisky in a dungeon.”

Celestia pinched the bridge of her snout and sighed. “To be fair, it’s not like I’ve ever done this sort of thing before.”

“Neither have I, but - wait…” Twilight muttered, squinting up at the Princess. “Did you even read those books I sent you?”

“I…” Celestia trailed off, averting her gaze while crossing her arms over her chest. “Of course I did.”

Less than convinced, Twilight quirked a brow. “Then what was chapter five about?”

The alicorn stiffened and shifted in place, her lips pursed, before her shoulders wilted. “I have no idea. I glanced over them, I really did, but I was simply too busy. Twilight, I’m so, so sorry…”

“It’s fine,” Twilight murmured.

She’d accounted for this moment, realizing that it was more than possible that her lover had become preoccupied with her official duties. Clearing her throat, she gave herself a moment to calm down. With a pinch of luck and a bit of finessing, the evening would still be salvageable - she hoped…

“So as a dom, you’re supposed to abuse me a bit,” she explained, drawing a shocked gasp from the Princess. “I’m your sub, so you should use me like a toy - teasing me, fucking my brains out, spanking me, there isn’t much that’s off the table.”

“I’d h…hate to do anything too extreme,” Celestia lamented, her kind words standing in stark contrast to her colossal endowment. “If you were in my shoes, what would you sugg-”

“Fuck my face,” Twilight interrupted, staring longingly at the log of flesh swinging between the alicorn’s legs.

Though Celestia stayed silent, peering down at it, it was what wasn’t said that spoke to her success. The Princess’ cock jerked upward, swelling to nearly its full, incredible size. To hammer the point home, more than ready to get things started, she opened her jaw and invitingly extended her tongue. If the sight of a mare asking to get her throat swabbed wasn’t enough to get somepony going, nothing would be.

“W…well, I suppose I could…” Celestia breathed, repositioning herself and bringing her colossal dick to bear. “Just tell me if I’m being too harsh.”

“Uh-huh - yeah, sure,” Twilight hastily replied, swiftly opening her maw for the Princess’ approaching length.

Staring down the imposing length, she shuddered when the broad, fat tip graced her tongue. Stars above - regardless of how her plans had fallen off the rails, it would have been impossible for her to be upset while sucking Celestia off. Inch after girthy inch of shaft crept into her muzzle, coating her palate with the earthy flavor of unwashed flesh and filling her sinuses with the ambrosial scent of musk.

As her lips tenderly closed around her lover’s stallionhood, she closed her eyes. She would never have guessed that Celestia had such a perfectly intimidating appendage, especially since she’d grown up around her, but that was hardly a complaint. Slowly bobbing her head, she put her tongue to work.

“Mmmmm,” Celestia approvingly hummed overhead. “That’s nice.”

The statement should have comforted her, warming both her heart and loins, yet it gave her a moment for pause. Twisting her head to the side, she glowered up with one eye at her mate. She’d said she wanted something more than tender treatment, and she’d meant it. With the utmost hesitation, apparently realizing she’d erred once again, Celestia reached down and clutched the base of her skull.

She took a deep breath in preparation, filling her lungs for what was to come. The Princess stepped closer and drove her hips forward, driving the gargantuan length into her gullet. With a stifled gag, doing everything she could to relax her throat, she felt her neck bulge outward from the immense intrusion. Her eyes wandered forward and gazed down the shaft before her, filling her with glee.

Despite her telling Celestia dozens upon dozens of times, she loved being pushed to her limits. Her jaw was forced open, her tongue driven down, and her airway totally blocked by the thick cock sliding into her. The intensity of it, the trace of discomfort mingling with the physical and psychological delight of servicing someone so magnificent, was almost enough to make her cum on the spot - almost.

As her lips touched her lover’s medial ring, Celestia rolled her hips back and began bucking in earnest. The long, steady plunges were just enough to let her get the periodic sip of air, flooding her nostrils with the alicorn’s bouquet, while her marehood needily clenched upon itself. She instinctively moved an arm, attempting to tweak her nipples, but was reminded of her position. For future attempts, she’d be sure to lock the stockade and have a negation ring handy - that said, she was happy that things were finally moving in the right direction.

The Princess’ thrusts gradually grew harder and faster, though not nearly as harsh as they could have been, as her passion soared. There’d been plenty of times when she’d been turned on by her lover, but this time was different - this time she couldn’t do anything to relieve the ache in her loins. Seconds stretched into a minute and longer still, her marehood leaking to the floor between her feet, until Celestia finally slowed.

“Had enough?” the alicorn mused, peaking a brow.

Relishing the sensation of the shaft fleeing her throat, Twilight mopped the length free of saliva and pre-cum until the bloated tip popped from her snout. “Yes - buck yes.”

“Good,” Celestia purred, “because now I’m going to give you what you deserve.”

“Wait - seriously?” Twilight squawked. “You’re going to rut me already?”

Stepping down her side, Celestia rested a hand on her tush. “We’re both clearly turned on, so I can’t see why you wouldn’t want us both to have a bit of fun.”

“At…at least spank me some more,” Twilight stammered, her raging libido waging war against her expectations of being properly dominated.

The princess came to a halt behind her, looking no less conflicted than she had been earlier, and tentatively raised a hand. “Well I s…suppose I could…”

Smack

The slap on the rear was followed by a second, then a third and a fourth, until Twilight unleashed a shuddering sigh. She hadn’t been more turned on in - well, she couldn’t recall ever being so turned on before. The spanking really wasn’t all that harsh, yet the bit of pain elevated her arousal beyond measure. Glancing to the side, spotting a paddle hanging from the wall, she broke the promise she’d made to herself not to use her magic and levitated the item over.

“Use this,” she breathed, arching her back and presenting her ass.

Celestia reluctantly took the item from her sorcerous grasp. “Are you sure? It looks like it will hurt…”

Screwing her eyes shut, Twilight shook her head. “That’s the point. Spank me with it while you plow my brains out.”

The irony of the situation wasn’t lost on her. Despite supposedly being at Celestia’s mercy, she was the one giving the orders - still, she was losing her patience. If she’d spent a bit more time and thought into the endeavor, she would have put herself in charge to show the Princess how things were really done, but that could wait for a later time. As she stood on her tiptoes with her tail flung to the side, holding her breath and waiting expectantly all the while, she was rewarded with a strike to her rear.

“Mmmmmph,” she groaned, gnawing her bottom lip.

Withdrawing the paddle, Celestia ran the leather over her flank. “Another?”

“Yes, darn it,” she pleaded.

She was growing desperate, yet in a poetic, unexpected way. The next blow came after only a second of hesitation, setting her nerves alight and causing her eyes to roll back slightly. Yes - buck yes, this was the way it was supposed to be. Locked up and amorously abused by her demigod she-stud, she whimpered in unfettered glee.

Maybe it was because she’d always respected Celestia, having always done her best to please her former mentor, but the thought of being used in such a salacious fashion never failed to moisten her panties. She threw her head back and brayed, her knees buckling and thighs quaking all the while. If she hadn’t been placed on a hair trigger before the kinky treatment, she sure as Tartarus was now.

It wasn’t quite as merciless as she would have liked, but her rear was tender and undoubtedly reddened by the time Celestia drew to a halt. Fighting to catch her breath, with sweat beading on her brow, she started when something warm and fat kissed her lower lips. Feeling a hand glide up her flank and to her waist, she knew that the time had finally come.

“Do it,” she mewled, attempting to roll her hips back, “rut me like I’m your slutty little mare.”

“That’s because you are my slutty little mare,” Celestia tittered, sounding a bit more sure of herself.

No sooner had the words passed the Princess’ lips than she was spread open. The breath hitched in her throat, her heart skipped a beat, and she almost came on the spot as she was impaled. By all the stars in the sky, nothing - nothing could compare to the feeling of being stretched open by the alicorn’s heavenly endowment. Inch after wondrous inch was driven into her, until her lover’s medial ring bumped against her entrance.

She hadn’t foreseen Celestia continuing to use the paddle, having nearly given up hope, so the blow to her rear as the Princess withdrew sent her sailing over the edge. Her rapturous wail reverberated off the stone walls, echoing in her ears, while climactic nectar gushed from her spasming depths. Waves of blinding pleasure crashed over her, eclipsing her annoyance in the blink of an eye.

“That must be a new record,” Celestia moaned, freeing a portion of her length. “Maybe there’s something to this kinky stuff.”

“Uh…uh-huh…” Twilight thoughtlessly replied.

Even if she’d been free to take a more active role, she wasn’t sure how much she would have been able to do. More often than not, she was the one who took the lead in the bedroom, worshiping Celestia like the goddess she was, but this time was different. Robbed of her freedom and overwhelmed with ecstasy, it was all she could do to remain standing and endure the carnal onslaught of her mate.

Grunting with each of the Princess’ thrusts, Twilight glanced to her left. While being blindfolded would have been nice, having heard that robbing one sense heightened the others, a part of her was glad that she could still see. Spotting herself in a mirror against the wall, she was given the opportunity to watch herself getting railed.

The muscles in Celestia’s legs and arms rhythmically flexed as she drove her hips forwards and back. Being significantly taller than average, and with strength to match her size, the alicorn was like an amazonian deity. She shifted her gaze, seeing the paddle lifted in her lover’s free hand, but there was nothing she could do to stop her mate.

As the leather impacted against her flank, she hissed and involuntarily clenched around the pistoning length stretching her insides. Compelled, her marish instincts seized hold. Constricting and relaxing her depths in tune with the Princess’ plunges, her marehood milked Celestia’s cock for all its worth. Reduced to little more than a lustful beast, she panted and whorishly moaned.

Celestia gave no quarter, succumbing to her she-stud urges, and eventually dropped the paddle to grip Twilight’s hips with both hands. The aroma of sex filled the air, their colliding bodies crafted a drumbeat, and the floor grew slick with a cocktail of marish juices and pre-cum. The Princess may have been loving and gentle to a fault, yet the combination of novel kinks and their surroundings took a toll on her inhibitions.

Twilight cried out yet again, wracked with another climax, while sparks sailed from her horn. She had to admit, even with her faults, Celestia was a peerless lover. The battering-ram like stallionhood within her battered her womb, the thick medial ring ground against her g-spot, and the Princess’ fat, cum-laiden balls slapped against her clit, erasing what little refractory period she had and sending her skyrocketing towards another orgasm.

Time gradually lost meaning as she was hit with wave after rapturous wave of ecstasy. She couldn’t say how long she stood there, locked in the stockade and unable to move, but she snapped back to her senses when she felt her lover start to flare. Summoning a strength she didn’t know she had, she bore down and squeezed Celestia’s cock.

“I…inshide,” she slurred.

“I…I’m gonna,” Celestia croaked, frantically pounding into her.

The Princess gave one final, unstoppable plunge, sheathing every inch of her incredible shaft, and draped herself over Twilight’s back. As warmth blossomed deep in her abdomen, her interior coated with thick, virile seed, she came alongside her lover. Nothing in the world quite compared to being claimed, taken and bred by her mate, and it was the perfect way to finish what was an imperfect evening.

Celestia shudderingly lifted her muzzle and brought it to Twilight’s ear as she reached around to lovingly squeeze the mare’s breasts. “Was it as good as you hoped?”

“M…m…” Twilight began, finding it almost impossible to speak. “Mostly…”

“Mostly?” the Princess parroted, shifting to look her in the eye. “How mostly.”

“Should have used those,” she breathlessly replied, weakly nodding over to a rack of toys, tools, and various pieces of bondage equipment. “D…don’t worry, I’ll show you h…how it’s done next time.”

Exhausted and satisfied though she was, she’d meant what she said. The christening of their little playroom was a trial run, so she should have known things wouldn’t go exactly as she’d planned. She twisted her head and gave Celestia a peck on the nose, relishing the stunned look in her mate’s eyes. The Princess may not have realized it, but she was already formulating a contingency for their next little foray into BDSM…

Slapping the crop to her hand, Twilight smirked. “Somepony’s bad little Princess,” she cooed, reaching out and caressing the crop’s tip to her nipple.

Top

Glancing over at her bedroom clock, Celestia knit her brow and slowly exhaled. It was ten o’clock exactly, the exact time she was supposed to meet Twilight in her dungeon, though she’d be lying if she said she wasn’t nervous. After her and her lover’s first foray into BDSM, her adorable little lover had given her strict orders - orders which had been harder than she would have imagined to complete.

For starters, Twilight had told her to abstain from any sexual activity for a week, going so far as to make her promise not to touch herself - secondly, she’d been instructed to teleport herself to their little sex-dungeon at precisely ten p.m. on Saturday night. Magically whisking herself to the bowels of the keep would be a trivial affair, although refraining from masturbation had left her more than a little pent-up and frustrated.

Darned if she had the slightest idea of what she was in for, but she hoped it would be something that would leave herself and her mate satisfied. With a flash of light and pop of displaced air, she blinked and found herself in total darkness. She reflexively sent power surging into her horn, confused as to why she hadn’t found Twilight waiting for her, but she froze when somepony gently grabbed her wrist.

“Hold still,” Twilight’s familiar voice intoned.

“Twilight?” she asked, looking in the direction of her mate. “What’s the -”

“Shut your eyes and stop using your magic for me,” the unicorn interrupted.

More befuddled than ever, Celestia did as she was asked. The dim glow around her horn faded, she screwed her eyes closed, and she patiently held her hands to her sides. “Alright,” she sighed, “now what.”

What sounded like heels clicking against stone echoed through the chamber, before Twilight spoke again. “Bend over…”

She paused, taken aback by the stern command, but ultimately yielded. After her blundering attempt at being a dom, she couldn’t blame Twilight for wanting to educate her on the subject - that said, she was a bit anxious. Cocking her head when something cold slipped down her horn, she felt an odd tingling sensation course through her.

“I…is…” she stammered, “is that a negation ring?”

“Mmmhmm,” Twilight blithely hummed, stepping behind her and gently taking her by the wrist. “Now follow me.”

Blindly turning her direction, Celestia scrunched her snout. “With my eyes closed?”

“With your eyes closed, yes,” Twilight confirmed, leading her onward.

With a heavy sigh, she obliged and walked along behind the unicorn. She’d had no doubt that her lover had plans for this evening, but being denied the use of her magic straight away caught her off guard. As she was guided onward, left to wonder what she was in store for, she eventually came to a stop when something cool and hard bumped against her leg.

Slapping what sounded like a wooden surface, Twilight snickered. “Turn around and carefully sit down for me - don’t worry, I’ll hold your hand to make sure you don’t fall.”

“A…alright,” Celestia murmured, cautiously turning.

Though it took a bit of doing, going by feel alone, she managed to ease herself down and carefully recline. She had to assume she was laying on some sort of a table, but that was only her best guess. Fidgeting slightly, trying and failing to get comfortable, she flinched when she felt her shirt being drawn up her body.

Twilight chuckled and pulled her top up and over her bare bosoms. “Can’t have much fun dressed like this!”

“I can - darn it,” she hissed, trying to magically yank her shorts off.

“It’s ok, I’ll get it,” Twilight cheerfully noted, having removed her shirt.

As she was steadily undressed, left buck naked on the slab-like table, she quirked a brow. “Now - wha?!”

Before she could finish speaking, her limbs were hauled in opposite directions and held firm by Twilight’s magic. The move was so sudden and startling that she was so concerned that her eyes sailed open, but it was too late. Twisting her head and looking up at one arm, she watched as a thick band of leather sorcerously wound around her wrist and tied itself to one corner of the table.

“I’m all for some g…good fun, but isn’t this…” she trailed off as she looked down at Twilight.

She honestly hadn’t been sure what to expect, presuming her lover had donned something special for the evening, yet the sight of the unicorn evoked a number of emotions. Purple straps wound around the mare’s slender torso and upper thighs, leaving her bosoms and nethers wholly exposed. As if her mate’s slatternly outfit wasn’t provocative enough, the long, slim riding crop Twilight flexed between her hands added an erotic, slightly disconcerting element to the shocking circumstances.

“Not what you were expecting ~ huh?” Twilight inquired, walking down the table’s length while drawing the leather tip of her tool down Celestia’s outer thigh.

Despite her astonishment, Celestia felt her stallionhood twitch. It wasn’t the first time she’d seen Twilight wearing something sexy - heck, she’d bought the mare negligee and lingerie on a number of occasions, but this was entirely different. Her eyes wandered up and down the unicorn’s nearly naked body, drinking in every erotic facet of the outfit, until they ultimately settled on Twilight’s groin.

She’d had every expectation that they’d do something naughty, but she wouldn’t have guessed she’d end up tied helplessly to a table - moreover, she was totally and completely enthralled with Twilight’s look! Shivering when her teat got a light smack, she felt her cock jerk upward. This was bad - she’d only just arrived and she was already at her lover’s mercy while getting a shameful boner.

Twilight drew to a halt by her hip, leaned forward, and placed a hand on her plump, furry balls. “Bet these bad girls are nice and full for me…”

“W…well, I did what you asked and haven’t touched myself for t…the last week,” Celestia whispered, her cheeks darkening.

“I can tell,” Twilight laughed, giving one orange-sized nut a light squeeze. “Since you were obedient, I think you deserve a little reward.”

“A reward?” Celestia chirped.

Giving a nod, Twilight called upon her magic and made a coin appear between two of her fingers. “A reward, yes, but first we’ll have to set some ground rules. If you become too uncomfortable and want to stop, I want you to blink at me three times ~ got it?”

“Like this?” Celestia countered, slowly blinking three times in a row.

“Yes, like that exactly,” Twilight cheerfully affirmed. “With that out of the way, now we can talk about your reward. Are you ready to play a little game?”

Celestia tugged fruitlessly against her bonds as she stared at the gold bit. “I do like games.”

“Then you’ll love this one,” her mate tittered. “Heads means I’ll cast the same contraceptive spell that I always do, but if it lands on tails…”

As her eyes widened, she swallowed hard. “If it lands on tails ~ what?”

“If it lands on tails, I’ll use a fertility spell on myself instead,” Twilight explained, running the coin down between her tits and to her abdomen. “Even without an enchantment, I’m sure you’ve got enough thick, rich foal batter stored up to knock me up several times over.”

She watched as her student-turned-lover lifted the coin and tossed it into the air. The bit turned and flipped over and over, sailing over her body, until it landed almost perfectly between her breasts. Eyeing the little golden disk, seeing it had landed on tails, she felt her mouth go dry.

“This is a joke ~ right?” she whispered, turning as Twilight walked over and smiled down at the coin.

“I wouldn’t worry too much about it,” Twilight quietly replied, giving her a wink. Picking up and tossing the bit over her shoulder, letting it clatter on the floor behind her, she looked to the wall and levitated what appeared to be a ball with a strip of leather hanging from a rack. “Let’s just just pretend that this is the real deal.”

Words couldn’t express the relief Celestia felt - nevertheless, the thrill of the moment was overwhelming. She’d never spoken of it to anypony, but there were times when she’d fantasized about siring a foal with Twilight. Not only would having a child out of wedlock be scandalous beyond relief, but to do so with her protege would tarnish her image in the public’s eyes.

Patting her cheek, Twilight snagged the small ball from the air and brought it to her muzzle. “Open…”

Her lips parted, the rubber ball was delicately stuffed in her maw, and the strap of the contraption was fastened around the back of her head. Effectively muzzled by the soft rubber sphere, she prodded the gag with her tongue. While there were holes drilled in the contraption, allowing her to breathe easily, she couldn’t fathom what the thing was meant to do.

“Now that that’s out of the way,” Twilight casually remarked, lifting one leg and placing a knee beside her head. “Let’s get my breeding stud nice and warmed up.”

As her lover swung a leg over and straddled her head, she was given an absolutely perfect view of Twilight’s nethers. There wasn’t a lewd act she didn’t enjoy with the mare, but she wouldn’t deny that she had a soft spot for eating her mate out - sadly, with the ball stuffed in her snout, all she could do was stare longingly at the immaculately presented snatch mere inches from her nose. Drawing a breath through her nose, she shuddered as her nostrils were flooded by the delicately feminine aroma of sex.

“That’s right,” Twilight mused, swaying her hips, “deep breaths.”

Celestia tried once again to free herself while her carnal instincts grew in strength, but to no avail. Being denied the right to do anything to her mate would have been torturous enough, yet she quickly realized that Twilight was far from finished with her. Her ears perked up as the sound of magic cut through the air, moments before her nipples were twisted and cock gripped by an arcane force.

“Mmmmph!” she yelped through the gag, sending saliva through the ball and down her cheeks.

Softly laughing to herself, Twilight rocked back and ground her pussy against the Princess’ nose. “You like that? Bet you’d love to hold me down, warm me up, and then breed me like I was your personal broodmare.”

The mention of broodmare fanned the flames of Celestia’s lust. She bucked her hips as much as her bindings would allow, while her lover continued sorcerously stroking her off. While she wasn’t normally one to be assertive, the notion of doing as Twilight said was more than a little appealing.

Uncaring of the alicorn’s torment, Twilight continued. “Just imagine us walking through town together. All your subjects would know who was to blame for my big, leaking tits and rounded belly.”

Celestia grunted again, feeling already beginning to leak pre-cum. A sliver of her higher self realized that Twilight was merely playing a role, having fun with the fetish and the power it afforded, yet the combination of helplessness, physical stimulation, and not knowing what she was in for made it impossible to think clearly. She would have been in a pitiful state from a week of blue-balling alone, willing to do almost anything for her mate, yet she genuinely feared she may slip into a rut lust from being treated like a plaything.

“Good stud,” Twilight purred, falling onto all fours to kiss the alicorn’s cock. “I want you ready to ravage me once the time is right.”

All but thrashing in place, doing her darndest to spit the gag from her mouth, Celestia groaned and drooled over herself. She would have given anything to lap at her lover’s goods, desperate to do something - anything more than just lay there, but all she could do was lift her head, press her lips to Twilight’s marehood, and get the barest taste of unicorn’s juices.

In a word, Twilight was utterly merciless. She’d almost randomly interrupt the magical handjob with an actual handjob, squeezing and caressing her length with her slender digits, although things only got worse from there. Aside from having her nipples twisted and yanked upon, she was lightly slapped on her flanks, upper thighs, and even her balls by the riding crop; it wasn’t hard enough to genuinely hurt, but the slight discomfort elevated her pleasure by an unbelievable degree.

The amorous torture could have lasted for hours or mere minutes, although it felt as though it lasted for a small eternity. By the time Twilight relented, rising back onto her knees, she was an absolute mess. Her chest heaved, her teats were tender as all get-out, and her stallionhood was so hard that it hurt, as the unicorn shuffled down her body and steadily turned to face her.

With the towering length of alicorn meat throbbing before her, straddling the Princess, Twilight gingerly pressed the colossal stallionhood to her abdomen. “Think it’ll fit…?”

As nonsensical as the question was, having consummated their love innumerable times, Celestia was given a moment of doubt. The head of her cock came to rest above the mare’s navel, showing just how deep she would go when fully hilted, leaving her to marvel in awe. Had Twilight been anypony else, she would have felt genuine concern, yet her raging libido made her snort in frustration.

“I hope somepony is ready to start a family,” Twilight added, rising up and inching forward. Bringing her marehood to bear, she kissed her entrance to the tip of her mate’s length. “Oh wait, I almost forgot…”

Waiting for a moment, growing increasingly desperate, Celestia snorted. “Mmmnnnph Nnnf?”

“Aside from having you practice your patience, do you know why I had you wait a week for this?” Twilight asked. As the Princess shook her head, she giggled like a schoolfilly. “It’s because I was waiting to go into heat.” The moment she finished speaking, she lowered her hips and impaled herself.

Celestia’s toes curled and her hair stood on end as Twilight’s snug, staggeringly hot confines embraced her. It may have been her imagination, but she could swear her lover felt different than usual - then again, the mention of being in estrus would explain why the mare’s body temperature would be elevated. Flexing her groin and causing her stallionhood to jerk within her mate, she was rewarded for her efforts by a guttural, slatternly groan.

“Oh buck,” Twilight moaned, rubbing her abdomen as she slowly descended. “You’re just so big…”

Though she couldn’t count how many times Twilight had ridden her cowgirl, she could swear that the view of her lover atop her would never get old. As if sensing her thoughts, the mare reclined and placed her hands behind her head. It was funny - the soft-spoken girl she’d tutored for years had blossomed into a stunning, drop-dead gorgeous young woman - her woman.

Only slowing when she reached Celestia’s girthy medial ring, Twilight winced in concentration. “Almost…there…”

Celestia tried - stars above, she tried to buck her hips, but her bindings held firm. Tied to the table, unable to use her magic, she’d been reduced from a Princess to a living, breathing marital aid for her mate. With an annoyed grunt, Twilight threw her weight down, sheathed the entirety of her length, and proudly smiled down at her.

“Right where it belongs,” she mused, rubbing her abdomen with a hand, “but we’re not finished yet.”

Following her mate’s gaze, seeing a length of chain floating from the wall, Celestia went motionless. Leather and a bit of spanking was one thing, but anything involving cold, unyielding metal may be a bit too much. She moved her head and watched as the item drew closer and realized there were two small clamps affixed to either end.

“Just one last thing,” Twilight hummed, clipping the chain to her nipples.

The magical tugging had been intense, but the metal clamps were on an entirely different level. Writhing on the table, beset by a maelstrom of delight, she whimpered through the ball in her muzzle. Had she been able to speak, she shuddered to think of the things she’d beg Twilight to do with her - to her, yet the gag stifled her every word.

Twilight flexed her legs, lifted her hips, and freed several inches of the Princess’ length before steadying herself and slamming herself downward. She didn’t stay motionless for long, exhaling as she repeated the process a second and third time, all while keeping her hands to the back of her head. As she steadily started to bounce, fucking herself on the supine alicorn, a twisted grin split her muzzle.

Unsure of where to look, Celestia’s eyes wandered over her lover’s body. Seeing her length rhythmically disappearing into and reappearing from her mate’s marehood was captivating, yet that was only one fraction of the overall spectacle before her. Twilight’s face, swaying bosoms, slender frame, and fetishistic attire were the stuff of wet dreams - so much so that she may ask for a few photos to keep her company on the long, lonely nights in her room.

She threw her head back and howled as Twilight hauled on the chain and continued riding her. The cocktail of raw, unrefined pleasure and the trace of pain were unlike anything she’d ever felt before, driving her to the cusp of madness. If she was free - ancestors forgive her, if she was free, she would have given her mate the plowing of a lifetime. Shifting her legs and trying to get her feet on the table, only managing to bump her heels against the wooden surface, she set her jaw and flexed her arms.

“So needy,” Twilight whispered, cupping her tits. “Do you want me to untie those pesky straps?”

Stopping dead in her tracks, Celestia stared up into Twilight’s eyes. This was a trap - it had to be. If she’d been able to get loose so easily, why in the world would her lover have waited this long to set her free? She held her breath, hoping - praying she wasn’t being toyed with, and sank her teeth in the ball clamped in her jaws.

Twilight leaned forward, pressed her tits to Celestia’s face, and reached for the Princess’ wrist. “If I let you go, will you behave?”

“Mmmph,” Celestia growled.

“That’s not very convincing,” Twilight sighed, bucking back on the alicorn’s shaft. “I said, will you behave…?”

Barely holding back her bestial desires, Celestia grunted again - softer and less angrily this time. There was no way in Tartarus that Twilight could understand a word she was saying, but it didn’t take a genius to figure out that behaving was the last thing she’d be doing once she got her arms and legs free. Nodding again, slower this time, she fought to control her breathing.

“Good,” Twilight hummed, untying one of the Princess’ wrists. “Now for the rest…”

It took everything Celestia had to hold still, fighting the compulsion to grab her lover, but she somehow managed to keep still. Waiting until her arms and legs had been unbound, she lifted her head and allowed the mare to remove her gag. Though she finally had her freedom back, her respect for Twilight held back the tidal wave of her desires.

Twilight remained where she was, tossed the gag to the side, and placed her hands to either side of the alicorn’s head. “I’m going to make this very simple - I want you to fuck me like it’s the last night of our lives…”

Celestia had braced herself for anything, yet she was taken aback by the deep, passionate kiss Twilight gave her after she’d finished speaking. Her hands shot to the mare’s hips, she planted her feet on the table, and she obeyed her lover’s command. There was no buildup or gradual escalation of force - no, she railed her mate with everything she had.

The wet slaps of their colliding bodies mingled with their groans and whimpers while they made wild, passionate love. She couldn’t speak for Twilight, but all the prolonged edging she’d endured, compounded by the imposed abstinence from the last week, made the experience downright nirvanic. Her stallionhood throbbed with every beat of her thundering heart, sweat glistened on her fur, and her fingers sank into her lover’s hips, as she yielded to her primal urges to breed.

For a mare all but literally getting her brains fucked out, Twilight gave as good as she got. Hammering her ass down to meet Celestia’s thrusts, she moaned into the Princess’ mouth. She clenched around the she-stud’s cock with every backstroke, wringing pre-cum from its girthy length, before relaxing her depths for every plunge.

Like a rare treat, Celestia’s reward was more than she could have ever hoped for. She felt fantastic in every conceivable way, riding the high of her torment while savoring the mare’s tight, silken depths, yet embracing who and what she really was was intoxicating. She’d spent centuries suppressing her yearnings, fearing what she may become if she allowed her natural instincts to seize hold of her, so finally being able to let herself go was cathartic.

While she was a Princess, she was also a she-stud without peer. She was bigger, more heavily endowed, and stronger than nearly anypony in existence, yet she’d always viewed those traits with a trace of dread. For the first time in her life, she considered a new possibility - maybe being a towering, powerful dickmare wasn’t that bad.

She pulled back, broke the kiss, and locked eyes with Twilight. “I love you for this.”

“I…I - Aaaaahn - love y…you too,” Twilight mewled.

Pulling the mare to herself, she began making out with Twilight once again. As happy as she was with her lover, she had an order to obey. Her body was like a machine made flesh, practically every muscle about her frame tensing and relaxing, and it was only a matter of seconds until her brutal rutting had an effect. Practically screaming into her maw, Twilight came.

The wash of nectar which flowed from around her pistoning length, paired with the sensation of Twilight shivering uncontrollably, pushed her closer to her limit. She’d genuinely worried about her endurance, having realized she may not last for long, which made her lover’s climax gratifying to a fault. With no reason to hold herself back, she sought to sate herself at long last.

As she’d predicted, she wasn’t able to last for as long as she normally would have. The telltale signs of her impending release grew stronger and stronger, sundering her rhythm and spurring her on, until things finally reached a head. With her stallionhood wildly pulsing and flaring, its tip nearly doubling in size, she tightened her grip on Twilight’s hips and came.

Her lover orgasmed moments after her. She reared back and clenched her jaw, snorting and grunting as shot after seething shot of her seed flowed into her mate. If there was a more perfect way to wrap up the afternoon, especially after the week she’d had, she couldn’t imagine it. As she stared blankly up at the ceiling, exhausted and satisfied, a weary smile crept across her features.

“T…that was amazing,” Twilight wheezed, falteringly reaching up and plucking the ring from the alicorn’s horn.

Celestia nodded and practically gasped for air, yet she beamed down at her lover. “I couldn’t agree more, however…”

Lifting her head, Twilight knit her brow at the alicorn. “However?”

“However,” Celestia repeated, glancing to the floor and surreptitiously levitating the discarded riding crop to her hand, “I believe next time will be even more enjoyable for the both of us.”

Punctuating her statement with a gentle but firm smack to the unicorn’s flank, she couldn’t help but laugh. They’d opened a new chapter of their lives together, the BDSM adding an exotic spice to their love life, and she was thrilled to see what new and erotic things they’d try next. As they lost themselves to one another’s eyes, they leaned forward and locked lips with one another while quietly wondering what the future would hold for them…