Trial and Error

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…