On Her Knees

by Megapone

Rating: mature
Tags: Romance, Anthro
Length: 11816

In public, Rainbow Dash is the picturesque proud Wonderbolt. In the bedroom, though, Twilight pushes her to earn her "master's" love and pleasure. "Dashie" must embrace her role as Twilight's pet, or find her own needs left unsatisfied.

Out in public, Rainbow Dash is the picturesque Wonderbolt: Proud, confident, competent. In the bedroom, though, Twilight's latest interest is going to push her in the opposite direction entirely. Forced to earn her master's love and pleasure, "Dashie" must embrace her role as Twilight's pet, or find her own needs left unsatiated.

Contains: Futa on futa (F/F), heavy petplay, willing dom/sub relationship, nicknaming, taunting/teasing/fantasizing, orgasm denial, large endowments (but not hyper), messy orgasms, blowjobs, vaginal sex, and frottage.

A commission for ELZZombie. Coverart by the same. Edited by Troublesome Beast, Brony Fife, and Amda.

Published 1970-01-01 00:00:00 UTC
Last updated 2016-05-15 18:20:01 UTC

On Her Knees

“Oh, Raaaiiinbooow!”

Rainbow Dash grunted, and her nostrils flared. The late-morning sun of just-past-nap o'clock slid through the blinds of their bedroom, setting the pages of her book alight with a white-golden glow. She curled her knees more tightly against her chest, and let Daring Do and the Crimson Idol rest against her chin. She was reading, damn it. Twilight should know better than to—

“I had a fun idea for you!” Twilight said, her sing-song voice carrying over the back of her reading chair. Rainbow twitched, a vein on her forehead pulsing as she felt Twilight squeeze her shoulders, her marefriend’s slender fingers digging playfully against her tensed muscles. She did her best to keep her attention focused on Ahuizotl’s villainous speech—who the hay did he think he was, trying to trap Daring like that? It wasn’t like she wasn’t going to escape, duh—but Twilight’s possessive touch was making that extraordinarily difficult.

“Hngg.” Dash hugged her knees tighter to her chest and grunted again.

But Twilight’s hands roamed lower still. Rainbow bit her lip as she felt Twi’s fingers pushing across her chest, her marefriend’s hands sneaking in between thighs and tits. Twi's grip widened to take hold of Dash's round, perky breasts. Ever the athlete, Dash’s figure was built for speed and aerodynamics—but that didn’t mean that there wasn’t anything for Twilight to grab onto, and the insistent egghead was getting quite familiar with Dash's nips, too.

“C’mon, Dashie,” Twilight said. She bent down to nuzzle Rainbow’s mane; Dash couldn’t see her, but she could feel the warmth of Twi’s muzzle against her scalp; hear the soft intake of breath as Twilight tasted her scent. Twilight's voice was husky, lowering as she said, “It’s a beautiful morning. Don’t you want to have a little bit of fun?”

Feeling Twilight’s fingers groping through her tight tank-top already made reading even more difficult, but only seconds later, Dash felt something different touching her: a large, soft pressure, bumping directly against the back of her head.

She whirled on instinct—and found her muzzle prodding firmly against a large, round bulge protruding from the middle of Twilight’s skirt. Her eyes widened, and she felt a heavy blush alight onto her cheeks as the thick, masculine scent of Twilight’s crotch reached her. Even worse, she’d turned with her mouth open for a retort, and now found her muzzle half-stuffed with a fat bulge of flaccid, girthy stallionhood. Even covered by a thin skirt’s cloth, she could still taste Twilight’s meaty flavor, Twi’s cock stuffing her mouth without even a twitch of effort. Rainbow’s tongue prodded instinctively against it, rubbing with reflexive devotion along the slightly damp fabric and tasting the musk that all but drenched it. A shiver went down her spine, straight to her clit.

A beat later, she spat the invading bulge out. Sputtering, and with her cheeks blushing a bright, cherry red, she did her best to glare fiercely up at Twilight. “Hey! I’m reading here!”  Yeah, that was hella butch, Dash reassured herself.

Twi grinned cheekily back down at Dash, her hands on her broad, forward-thrust hips. There was a smug, hungry look in Twi's eyes that both pissed Rainbow off, and made her shudder with arousal. Twilight didn’t respond, not verbally at least. Instead, her horn glimmered once—and Dash found her book being yanked out of her hands. She grabbed for it, but couldn’t stop it from jerking away from her grip, stopping to hover somewhere near the ceiling.

“Twilight!” Dash’s cheeks burned. In a jolt of motion, she leapt to her feet, facing off right against her marefriend. “What the hay do you—“

“Ah-ah.” Twilight closed Dash's muzzle with another flicker of magic, a magenta aura literally zippering her mouth shut. Twi wagged a finger, a light purple wave still following it around, and closed her eyes with a smirk, reciting as though tutoring a recalcitrant student. “A proper pet needs to always make the time when her master wants to play. And you’ve had long enough to do your reading.” She giggled to herself. “Studying time is over—it’s time for your test.”

        Rainbow tore the zipper open. “Hey,” she said, as it vanished in a puff of light. “Y’can’t just come over here and order me around. I was in the middle of something.”

        “Can’t I, Rainbow?” Twilight leaned her cushy hip against the side of the chair, and smiled at her. Dash still hadn’t grown entirely used to the aftermath of Twilight’s alicorn growth spurt; even leaning over like this, her marefriend was still a good inch taller than her. Twilight was still the bookish nerd she’d always been...but there was a glint of confidence in her eyes, a lazy sort of assuredness that made Rainbow’s skin prickle with interest.

        Before she knew it, Twilight’s lips were on her own. Rainbow couldn’t help but lose herself in it, her marefriend’s full, confident lips hungrily tasting her own. Now that was new—Twilight was never timid, but she was rarely this demanding. She could feel Twilight’s hands curling around her shoulders, roaming across her stomach and groin—and a pulse of heat from Twilight’s horn. A similar throb of warmth echoed at Rainbow’s crotch, the energies of magic tingling at her muscles.

        Twilight tasted Rainbow’s lips for a moment more, their tongues curling delicately together. Rainbow felt her feet lift up, perching on her toes, as she found herself leaning forward into the kiss. Something brushed against her nipples—Twilight’s bust, thick and soft—and she let out a soft moan, her toes curling as Twilight took the kiss deeper.

        And then Twilight pulled back out of it, leaving Rainbow Dash sputtering and empty. Dash blinked rapidly up at her, even as Twilight gracefully pulled herself back up, her curvy form straightening itself in the air above her.

        “After all,” Twilight said, raising an eyebrow and nodding downwards. “You seem pretty interested yourself.” Dash followed her gaze downward—right to where a smaller, but no less noticeable bulge, was beginning to press up against the crotch of her pants.

        Her cheeks flushed. So that was what she’d felt. That certainly hadn’t been there before. And that was how Twi wanted to play it, huh? Resisting the urge to bite her lip, Dash stifled a small groan as the new stallionhood swelling steadily between her legs pressed even tighter against the confines of her panties. Above her, Twilight’s horn flickered steadily, the eager grin and almost manic gaze never leaving her marefriend’s face.

        “That,” Dash said, “is my boner. Not yours.” Her blush deepened. It wasn’t even her boner—the weight between her legs was as alien as it was exciting; she hadn’t even really noticed Twilight casting the spell, just the flare-up of her marefriend’s aura—but that wasn’t part of the game. “A-and that doesn’t mean you can just waltz over and feel me up.”

        Twilight giggled. “Come on, Rainbow,” she said. She took a step closer; by now, her own erection made a sizeable lump in her pant leg. Dash swallowed as she watched Twilight’s bulge snake further down toward her knee; her inner competitive streak was whining about how much bigger Twi's was, while another part of her was voting in a different direction over just that. “It’s clear just how much time you spent boning up for this test. I just want to see how you—“

        Her supple, deft hand brushed against Dash’s crotch. Rainbow grunted, a bead of precum bursting against her panties.

        Twilight’s lower lip curled lustfully against her teeth. “—perform.”

        Rainbow took a deep breath. She stepped back, resisting the urge to flex, to stroke her own growing erection. It might not be quite the length of Twilight’s, but the unfamiliar weight of it made her blood burn with arousal all the same. And those balls. She could see Twilight’s, rounding out the curves of her skirt nicely...but it was her own testicles she felt, pressing up treacherously against her thighs as they filled with seed.

        “No,” she said, firmly. It was important that she present a clear front. If Twilight wanted some action, then no matter how excited she got Dash, she still had to earn it. Rainbow smirked weakly, her nostrils flaring as she tried to clear her lungs of Twilight’s musk. “Go play with yourself or something.”

        Twilight sighed. “Oh, Rainbow,” she said, shaking her head. “Fine. But as it is our bedroom…”

        Twi's hands went to her waistband, slender fingers caressing the hem of her skirt. “...You wouldn’t mind, of course,” Twilight said, “if I, ah, aired out a bit. Just to release some steam.”

        Rainbow was already back in her chair, piloting on automatic. She stretched out, straddling one arm with her leg—a motion that, while lazy, had the effect of pushing her stiffening bulge ever-so-gently up into the air. She turned her head, held out a hand, and glared until Twilight sighed and let the book float back into her grip. Even as she turned to her page, though, Rainbow couldn’t help her gaze from darting back toward Twilight—and Twi’s demanding crotch. “Whatever,” she said. “Just...keep your hands to yourself.”

        Twilight smirked all the broader. Then, exhaling in a slow motion that emphasized her juicy breasts, she wormed both thumbs inside the waistband of her skirt, and then gently tugged it down.

        Rainbow tried to focus on her book—she really did—but she couldn’t help but peek over the top of the page. As Twilight tugged at her skirt, shimmying back and forth, Dash was treated to an eyeful of thick, black stallion cock—a bouncing, bobbing, black stallion cock at that.  It flashed through the empty space behind Twi’s waistband, a full three inches poking into view. The spheres of Twilight’s balls rustled against the fabric as the skirt descended, each fresh inch bringing more of Twilight’s royal endowment into view.

        The fabric was very clearly strained, the hem struggling to keep Twilight’s erection pointed down. It was incredibly thick—more than half the width of Dash’s wrist—and looked to be completely hard.

        Dash breathed in, and nearly choked on the musk of it. Geeze—and she’d thought Twi had smelled horny before. This was an entirely different level of lust. She could feel her blood quickening, her own cock drooling and her panties moistening with each inch of flesh that Twilight revealed. Rainbow swallowed, throat abruptly dry, her hand tracing up her thigh as she watched Twi’s medial ring pop into view.

        She had no idea how Twilight could make such a simple thing so ridiculously attractive. Rainbow had always been of the “strip fast, worry later” persuasion, but she didn’t doubt that Twilight had read—and subsequently written a report on—the dynamics of stripping properly. Her hips seemed to sway, her juicy thighs flexing as the skirt descended. The tops of her balls were visible now, a pair of plump, full orbs that pressed heavily against Twilight’s thighs. Rainbow found that she wasn’t even bothering to pretend to read anymore; instead, she was completely entranced by the gentle, almost mystical dance that Twilight seemed to be making.  Rainbow tried very hard to convince herself that the moisture on her chin was sweat, not drool.  It wasn't working.

        Without really noticing, Dash began to rub her crotch. She groaned at her own touch, her new stallionhood stiffening to its full length against her leg. Twilight may have been larger, but Dash didn’t seem to be small herself. She could feel it throbbing against her thigh, a slab of burning stallion meat pressing against her muscles. Her crotch flexed, and Rainbow grunted, her eyes fluttering shut for an instant.

        Damn Twilight for this. She knew just how much Rainbow liked this: the temptation, the persuasion, the confident, lazy seduction. Rarity may have wanted a gentlestallion, but Dash had never been willing to settle for less than an alpha. She’d usually had to settle for someone who just could keep up with her, but had always appreciated the stallions and mares who'd been able to not just keep up, but keep on top. Ever since finding that little tidbit of information, Twilight had been all too willing to play that particular role in the bedroom.

        There she was now, eyes half-lidded, with a lazy, expectant smirk on her face. When Dash had last looked, Twilight’s skirts had been somewhere around her knees, her overstuffed panties bulging with her tremendous endowment. Now, though, Twi’s skirt lay forgotten on the ground, her panties held delicately in her magic—and her stallionhood lying hard against her stomach.

        Twilight sighed aloud. “Now that’s better,” she said. She took a step closer, squaring herself against Rainbow’s reading position. “Don’t you think, Rainbow Dash?”

        Dash quickly slurped up a line of saliva from her cheek. She glanced back down at her book, her cheeks burning. “M-maybe,” she said. “Whatever.”

        “Mm. My balls just felt so heavy.” Twilight took another step closer, a somber look on her face and a near growl in her voice. “It’s nice to just let it all hang out sometimes, don’t you agree?”

        Rainbow did her best not to glance up—not to ogle those great, grapefruit-sized spheres bouncing lightly against Twilight’s thighs as she moved even closer. She really did. Her shaft stirred excitedly in her panties as she took all of Twilight in, and throbbed all the harder when she saw just how close Twi’s cock was to penetrating her own cleavage…

A moist, almost hot sensation against her lips jerked her from her reverie. Dash’s gaze darted up—and caught the lower flare of Twilight’s cock bobbing inches away from her face. Its curve dripped with pre; every so often, the shaft itself would throb, a good-sized bubble of arousal bursting free at the tip. And the smell. Celestia damn it, but it just wormed its way inside of every part of her and made her crazy enough to tear her mane out.

But it wasn’t that easy.

“Hey!” she snapped. She glared up at Twilight, though perhaps not as firmly as she’d like. “I thought I told you to keep your hands to yourself!”

“I am,” Twilight said innocently, pushing at Dash's reserves of will. “I’m following your every rule to the letter.” Her smile widened and she fluttered her eyelashes. “But can you keep your hands to yourself, Rainbow Dash?”

Dash stared up at it for a moment: that girthy, flexing shaft. Flushing, she let her hands come up a few inches...and then blushed even harder when she let them fall back down.

“Aw.” Twilight clicked her tongue. “Is my little pet too afraid to touch her master’s cock? That’s okay.” She winked down at Dash and leaned to one side; her shaft swayed, her heavy balls sinking against her luscious thighs as her center of gravity moved. “You can just use your mouth, Dashie.”

Dash swallowed. “I… I don’t wanna.”

        A moment later, she felt that same weight pressing against her muzzle. Twilight smiled down at Rainbow as she prodded Dash’s lips with her cock. Pre smeared against Dash's lips; on impulse, Rainbow’s tongue darted out to lap a gob of it from Twi’s drooling cockslit. She nearly moaned as she tasted it, all of that salty, musky flavor distilled into a single, masculine sense of sex.

        “I think you do,” Twilight said, her left hand against her chin while she chewed lightly on her pinkie. She pushed her hips forward, increasing the pressure against Rainbow’s lips. Her cock throbbed, another gob of pre bursting against Dash’s mouth. “After all, every good pet wants to please her master.”

        “I’m not your pet,” Rainbow mumbled—and just that much enunciation gave Twilight all of the space she needed to push her hips forward. Rainbow’s eyes widened as Twi demonstrated her new earth pony strength under plush alicorn curves, and she grunted as Twilight insistently shoved the first two inches of her cock past her lips. Twilight moaned, her wide-set hips squirming as she felt Rainbow’s tongue slide across the underside of her head.

        “Now that’s much better,” Twilight said, once she’d recovered. “Mm…” Rainbow glared sullenly up at her. Twilight chuckled, then made a little “go on” motion. “Well, Rainbow Dash? You know what to do.”

        Her face burning, Dash turned her attention back to her “treat.” It filled her mouth rather nicely, truth be told—in fact, it was damn near one of the widest things she’d ever had to accommodate. She slid her tongue to the side, and felt the shaft tremble as Twilight giggled above her. She slid it back, this time curling it against a particularly thick vein. As Twilight groaned, reaching down to massage her nuts with both hands, Rainbow took in another inch. She had to pucker her lips to get enough leverage; as she felt it pushing toward her throat, though, she could feel the steady river of pre running down her gums, filling her tastebuds with Twi’s salty arousal.

        “Now, that’s more like it.” Twilight moved one of her hands from her testes to Dash’s mane. She gave Rainbow’s scalp a squeeze, then slid her fingers through a few strands of Rainbow’s hair.  "You really know how to treat a mare, don't you, Dashie?"

        Twi grunted, beginning to slide her hips forward, and then back, casually bulging Rainbow's cheeks out, then letting them relax, then starting up again. Rainbow took it easily, slurping around her marefriend’s girth with each shift of her weight. “Oh, if only the Wonderbolts could see you now. Gulping down your master’s cock like the cute little slut you are.”

        The tips of Rainbow’s ears burned like fire. She—or at least a part of her—almost wanted to spit Twi’s cock right out...but another part of her savored the mental image, squirmed at it, made her tail flag for the want of it. She began to stroke her crotch again, wrapping her fingers around the thick bulge her own stallionhood made in her tight track pants.

        “And you are cute.” Twilight’s voice was soothing, lulling her like hypnosis. She wrapped her fingers more firmly, keeping Dash’s neck locked in place as she pumped a full seven inches—not even half—of her shaft past Rainbow’s lips. Dash grunted, acclimating to the shift in gear. “Why, such a cute little filly might be snapped up by anypony who might want to use her.”

Click. Rainbow froze, Twilight’s cock still prodding against the back of her throat. She swallowed, and the contractions sent Twi’s flare shooting geysers of precum down into her stomach. Her hand jerked up to her neck—and found a tight band of leather there, the metal latch pressing coldly against her flesh.

        Eyes wide, she glanced up at Twilight. Twilight only fondled Dash's ear for a moment, her grin stretching from ear-to-ear.

        “There,” Twilight said happily. Her hand drifted over Rainbow’s, and held it up to the light. “Now everypony will know just who you belong to. Not that there was any danger of you wandering off in the first place, right, pet?”

        There it was: a clean white tag attached to the side of the...the collar. “Property of Twilight Sparkle,” it said, written in clean, precise script; Rainbow didn't doubt that a crisply written address for their home would be on the inside strip. Rainbow Dash flushed, her face searing with mixed arousal and shame. The very thought of wearing this into the streets of Ponyville—or worse, with the Wonderbolts—sent her cringing away in fear, desperate to escape the very idea of it. She was Rainbow Dash, flier extraordinaire—not some alicorn’s pet!

        But that was what made it all the more exciting. Meekly, Rainbow re-set her lips, and returned to suckling on her marefriend’s shaft. Above her, Twilight stopped fingering the collar and let the tag fall against Dash’s collarbone, where it lay damningly.

        With a soft groan, Twilight thrust her hips further forward. Rainbow nearly choked—with that single thrust, she felt the bulk of her windpipe blocked, her throat contracting around her marefriend’s girthy length. Twi wasn't content to just facefuck her mare, no: she took Dash's ear in hand and twisted it with a firm, loving care, setting her mark on Dash's mating instincts, too.  "That's mine," Twilight whispered, "That pretty filly face, that slutty filly mouth... Ooh…"

        The second Twilight pulled back, Dash gasped for air, the color returning to her cheeks. Oxygen wasn’t the only thing that filled her lungs, though. Twilight’s thick musk had saturated the air by now, like a virile, well-endowed stallion’s, momentarily blanking Rainbow’s mind of any higher thoughts save a single higher purpose: worshipping Twilight's beautiful cock.

        Dash's hand released its grip on the bulge in her pants, every muscle in her body going slack as that divine, masculine scent filled her. She could smell Twilight—her stallion—in every pore, every fiber of her being. Her stallion wanted to be pleased—her master wanted to feel good. And if Rainbow helped her do so...she would be allowed to feel good in return.

        Rainbow exhaled, then inhaled deeply, her lungs filling with a fresh batch of that godly smell. She whimpered, tears beading at the corners of her eyes as Twilight drove her shaft further back into Rainbow’s throat, keeping Dash's head aligned with the constant weight against her ears. Twi was just so heavy, so warm; every throb of that girthy length sent a new cascade of precum drooling down into Dash’s stomach.

Rainbow’s own cock flexed against the tightness of her pants, a stain of precum spreading across the fabric while her vagina winked against her juice-stained panties. A shudder went through her body as Twilight let out a loud grunt, and twisted her hips roughly forward, ramming her cock inside of Dash again, and stretching Rainbow’s very throat around its width  Twilight licked her lips and cooed as she left a fresh blast of her arousal down Dash's throat

        “Nggh.” Twilight grunted, her voice deepening again as she slowly pulled her hips further forward. Gently, lovingly, her other hand caressed Rainbow’s mane with the tips of her fingers, at least before finally pressing them at the back of Rainbow’s skull. “Now that’s a good filly.”

        Twilight tightened her grip; Rainbow gurgled, moaning past a fresh burst of Twilight’s precum. A lazy smirk crossed Twilight’s face as she steadied herself, lining her stallionhood up with the angle of Rainbow’s lips.

        “Mm,” Twilight murmured. “Looks like your master’s getting close, Dashie. But you’re going to need to be a good pet and stay still, okay?”

        Dash hesitated—but the musk in her lungs was all of the real persuasion she needed. She nodded, very aware of the weight of Twilight’s member on her tongue.

        Twilight’s grin widened. “Great,” she said. She bucked her hips forward slightly, letting her plump balls bounce off of her thighs. “Because I’ve got a lot of cum stored up to feed you. Wouldn’t want you going hungry, now would we?”

        Dash went to shook her head, but Twilight’s grip kept her firmly in place. Instead, she could only whimper, both with need and fullness, as she felt Twilight’s member throbbing against her tongue.

        “Now,” Twilight said softly. “Like I said, just hold still—“

        At this point, only the head of Twilight’s shaft was still in Dash’s mouth. A scant two inches—maybe three—barely comprised even a quarter of her foot-plus endowment. With a grunt, Twilight tensed her hips, her thighs flexing as her stiffening rod spread Rainbow’s lips even wider. With a second grunt, she bucked her waist forward—and shoved twelve inches of fat, drooling marecock directly down Dash’s throat.  At the end of her thrust, Twilight arched her feet slightly, using her height to leverage her balls down over Dash's muzzle, letting them bob and bounce slowly.

        Rainbow’s eyes flew wide open, her pupils dilated. She gurgled, tried to swallow—but Twilight was just too thick! Twilight pulled halfway back, but then immediately rammed forward again. This time, not a single inch of maremeat was left outside of Dash’s warm, soft lips. Rainbow moaned around it, her own eager cock lurching in her pants and sending volleys of precum shooting against her thigh. There was just...so much!  An increasingly insistent part of her demanded that Twilight's generosity—her self-proclaimed master's generosity—could only be repaid by focusing all of the awesome that was Dash onto her master's pounding dick.  It was only fair, after all.

        With that, Twilight’s thrusts fell into a steady, obscene rhythm. Each pump of her jiggling hips sent all sixteen inches of her cock barreling down Rainbow’s throat, each thrust releasing ever-greater “loads” of precum. She was like a machine—fucking Rainbow’s throat like a piston, each jerk of her cock faster and cleaner than the last. The vibrations of Rainbow’s moans only left Twilight’s cock harder. It was all too much. She wasn’t just a servant. She wasn’t even a pet. She was a tool—reduced from a pony to nothing more than a cheap cocksleeve to milk her marefriend’s dick dry. Fuck, but she loved it.

        And loving it, Dash redoubled her efforts to be the best cheap cocksleeve, ever.

“—Ah! Ah!” Twilight’s grunting moans filled the air as she thrust forward again and again. Her hefty, cum-bloated balls slapped repeatedly against Rainbow’s chin, sloshing with their vast stores of seed. Twilight’s eyes rolled back in an expression of perfect bliss, her horn shooting off sparks as she bottomed out in Dash’s throat once more—and stayed there, parking her thick stallionhood in place and letting their mutual spasms bring her over all the more..

        Rainbow’s eyes widened as she felt the collar tightening around her throat, felt the tightness beget tightness as it involuntarily worshipped her master's dick. She felt herself growing lightheaded, her throat contracting slowly around Twilight’s shaft.  The world was cock, wasn't it?  Master's cock.  Master's pleasure.  Soon, maybe, master's cum?

        “F-fuck, Dashie.” Twilight panted, beads of sweat rolling down her face. Her cock shuddered in Rainbow’s muzzle, another volley of pre painting the back of Dash’s throat. “You’re so tight!”

        Rainbow moaned. Oh, gods, but she was. She could scarcely breathe, save for each inhalation of Twilight’s world-filling musk. She could feel it coating her face, her hide, filling her and covering her all at once, invigorating, driving her to fulfill her master’s desires, her every want. Dash’s libido spiked and seared like a branding iron; she was just so hard, so wet, so hot with lust and need that she could almost beg for release, beg for the sweet flood of Twilight’s salty, virile spunk—

        “—ah!”

        With a sudden jerk of her hips, Twilight pulled her shaft back, the flare sliding out of Rainbow’s muzzle with a wet-sounding pop! Rainbow felt the emptiness immediately: the aching hollowness in her mouth, her throat where Twilight’s cock had just been. Her stomach groaned, full of precum but empty of even a drop of jizz. She could have screamed in frustration..

        “—ooh,” Twilight moaned. She gasped lightly as her shaft brushed against her belly, and shuddered, beaming with a lewd spirit of inquiry. “That’s sensitive.”

        A bead of thick, white cream had gathered at the tip of her cock. Rainbow stared at it with wide, longing eyes. A heartbeat later, a deep, rippling purple aura surrounded Twilight’s stallionhood. The mare herself inhaled sharply as her member...bulged, starting from the top and slowly squeezing its way down. Her breathing grew wilder, more erratic, increasing in volume until finally something audibly plopped back into her nuts. Twi’s pupils dilated, her mouth hanging slightly open as her balls churned and sloshed and grew, swelling until they were half again their original size.

        “Mm…” Twilight grunted, and gave her stallionhood a light brush with the back of her hand. She shuddered, her balls seizing up as she shivered with obvious pleasure. “Now that’s an interesting feeling.”

        Rainbow Dash sputtered as she came up from her haze. Instinctively, she reached up to the stifling collar—and found her hand caught in the air, held in place by Twilight’s magic.

        “What the hay?” she snarled. “All that, and not even a drop of jizz? You didn’t even fucking orgasm? What the fuck—“

        With a flash of light, a muzzle appeared on Dash’s. Her mouth was forced shut, her voice tapering off to a whine. Twilight stared down at her, one eyebrow arched.

        “It is very rude to shout at your master,” she said crossly. “Goodness, Rainbow—what would Rarity think if she saw you like this?” She shook her head. “No; you’ll get my cum when you’re good and ready for it—and no masturbating.” Rainbow whimpered as a flash of magic batted her hand away from her own throbbing crotch. Twilight’s eyebrow went higher. “I am in charge of your pleasure, Dashie. You know that, don’t you?”

        Rainbow nodded slowly. Twilight’s frown shifted slightly into a smile.

        “Good,” she said. “And I can take that muzzle off of you, right? You’re going to be a good girl for your master?”

        Rainbow nodded, again, this time more energetically. Twilight smiled, and the muzzle disappeared. Dash sucked in a deep breath of air, her cheeks flushing red… And then Twilight's magic popped back into existence, its aura stretched and reshaped to capture Dash's aching dick.  Twilight tilted her head slightly to the left as Dash spluttered wordlessly, and then nodded, waving her finger lazily to wrap Dash's balls away behind her telekinetic grasp.  "Oh, hush, you big baby," Twilight scolded, "It'll come off when I let you cum.  Honestly.  I thought you were an iron pony-- oops, nope, just my pretty little filly!" She smirked.

        “Now,” Twilight said. She stepped closer, and grabbed Rainbow around the waist. Dash grunted as Twi grabbed a big handful of her ass; while not as wide-rumped as Pinkie was, Rainbow still had a nice round bubble butt that was just ripe for squeezing. Twilight took her time, squishing that toned, teasing rump flesh in her fingers as she teased Dash in turn, waggling her heavy dick around under Dash's torso and spreading her scent—and no few splashes of musky maremeat lube—over the pegasus' abs.  As she fondled Rainbow's ass like it was her property—and pretty clearly figured it was—Twilight flashed a grin at Dash. “Why doesn’t my cute little pet get on the bed for her master?”

        It was very hard to concentrate with Twilight’s erection rubbing against her belly like that.  It was marking her, a horny, primal part of Dash squealed.  Her stallion—

Rainbow swallowed, hesitated, fighting the urge to grunt and flag . “B-but—“

Smack! Rainbow yelped, stiffening as the impact of Twilight’s palm left her butt bouncing like a prime piece of meat.  Master's meat, Dash's inner squealer told her.  Master's cocksleeve, remember? Twilight giggled, almost as though she heard Rainbow's thoughts, and drew Dash even tighter as the spank echoed around the room.

        “What I’m sure my naughty pet meant to say,” Twilight purred, her hand rubbing the impact point of the swat, “was ‘yes, master, right away’!”

        Blushing, Rainbow nodded. “Yes, master,” she said meekly. “Right away.” Twilight let go of her, and Dash turned carefully toward the bed.

        “Oh,” Twilight added, as if it was an afterthought, “and get yourself undressed the rest of the way, too. I want to feel every bit of my cute pet’s body.”  Twilight licked her index finger and then stroked the saliva down over the flagrantly over-ripe heft of her dick.  "Outside as well as in, that is, cutie."

        Her hands trembling, Rainbow climbed onto their bed. When she’d been younger, she’d used to climb up stairs on all hands and knees, clambering up to the top like some little beast. Now, though, she couldn’t help but be reminded of those times as she felt the warm softness of the mattress sink beneath her palms. Back then, she’d liked to pretend that she was a dog. Today, she was all that and more. She was Twilight’s dog, Twilight’s pet—and though some part of her, some deep-down consciousness of “Rainbow Dash” struggled to break from this submission, she chose to let herself become “Dashie” instead. Dashie didn’t fight back. Dashie didn't need to push, didn't need to lead.  Dashie would stay down and wait to hear what her master commanded. The weight of the world, of the Wonderbolts, of everything except her love and her Element just melted away.

Dashie was going to get fucked so hard.

        The carpet scratched softly against the naked sole of Twilight’s foot as she stepped forward. Unable to keep herself from doing so, Dashie shyly glanced back over her shoulder—not quite meeting Twilight’s eyes, but instead letting the massive, flexing form of her master’s stallionhood fill her sight. Her lips parted in little pants, tongue flicking in and out as her belly burned with need for the cum she'd been denied.  She could smell the conquering sexuality of that beautiful rod from here: the musk of it, the heady, aromatic lust that dripped from every oozing glob of precum clinging to Twilight’s shaft. She took a deeper breath, and felt her cunt clench up at the scent.  She didn't need to tell her tail to flag this time.  It just did, her body knowing that when her master's prick approached, her master's cocksleeve must be open.

        And Twilight was so close now. Rainbow’s labia winked, her hot folds tensing as they anticipated being well and truly stuffed. Her own cock throbbed between her legs, a steady stream of precum dribbling down the tip and collecting within Twilight's magical sheath, the stiff rod showing how ready it was to bob and bounce as she was stuffed. Unconsciously, she lifted a hand from the mattress, itching to squeeze that sheath, to stroke her aching erection.

        With a grunt, Rainbow found her wrist caught in place. She blinked at it, and found it surrounded with the aura of Twilight’s glimmering magic. Behind her, she heard her master laugh softly, as though at a puppy tripping over its own tail.

        “Excuse me,” Twilight purred. “But did you really think I’d let you touch yourself like that?”

        Dashie hesitated. “Maybe?” she said, daringly wriggling her pert rump at her stallion.

        Twilight giggled again and lightly swatted the spot she'd spanked earlier. “Pets don’t get to cum before their masters,” she said. She took a step forward, and groaned as her full-mast erection slid wetly between Dashie's naked buttcheeks. Pre smeared across Dashie’s coat, matting her toned rump with Twilight’s arousal.

        This time, it wasn't a soft voice squealing praises to her master's maremeat.  No, this time, the mental squeal of Master is marking me! rang loud and clear in her ears, while only a tiny, sulky part muttered: rude.

        “In fact,” Twilight said playfully, “I think maybe we should make sure that you’re all nice and pent-up for me. What do you think?” She leaned forward, her nipples brushing against Rainbow’s shoulder blades. She leaned forward, pressing her weight down against the shorter mare.  Twilight let Dashie feel her, feel the pressure of belly to rump to back and at last, covering her entirely, a stallion over her fertile broodmare, as Twi's nipples scraped against Rainbow's wings and tense shoulder blades.  Dashie swallowed, her own cock flexing in its magic sleeve as Twilight wrapped her fingers lovingly around it.  Dashie's wings plumed out to either side, stiff and as far beyond her control as her side-arched tail.

        “If—if that’s what you want,” Dashie said. She felt her tight, stuffed balls swell with further seed, and stifled a groan. She needed release—but Twilight wanted her compliant, and she needed to obey her master more than she needed release. Primed and ready. Barring magic, she could have easily pushed Twilight off of her, pinned her to the mattress, and gone to town on her aching erection.

        But Twilight was in control now. Dashie couldn’t just get herself off, no matter how much she might have wanted to. That right belonged to her master, and her master alone. She saw Twilight’s smirk in her mind’s eye, felt her shaft twinge in lonely need, scraping against the sleeve, and shuddered as she let her muscles go slack. Rainbow Dash might have wanted to jerk off, but Dashie was just her master’s pet.

        And Twilight knew it. “Good girl,” she said. She stroked Dashie’s thigh with one hand as the other’s thumb rubbed gently against the base of her mare's shaft. The magic she'd trapped Dashie's poor erection in was pliant to Twilight's touch, letting her softly caress the sensitive flesh of her plaything.  “But stallions so often have a hair trigger. I think we should play it safe, don’t you?”

        “What do you—nggh.” Dash grunted, her throat tightening as Twilight’s magic popped a good-sized cockring into existence just above her flare. It would have fit most any stallion nicely, but Rainbow’s stallionhood was already above the curve. On Twilight’s massive log, whose weight pressed heavily against Rainbow’s tensed flanks, it wouldn’t even have fit around half the radius. On Dash’s, though…

        She gulped, then gasped when Twilight slid it forward. The bright-purple ring slipped into the darker purple of the cocksleeve, over the curve of her flare, and her shaft flexed in instant reflex. A spurt of precum burst from her tip, adding to the mess held within—and then instantly died, the pressure of the thing leaving her passage constricted and tight. Twilight giggled.  "See?  Hair trigger.  Scientific fact.  Mmm, and you're such a messy pet, too.  Let's clean that up before we get started."

Twilight reached around Dashie with both hands, deft fingers running through the trapped lube and collecting it expertly in her telekinetic field.  Dashie's eyes suddenly crossed and she let out a whimpering gasp of pleasure and constriction as Twilight duplicated the same feat she'd done to herself-- and forced Dashie's precum back down her dick, through the impossible clench of the cockring somehow  Finally, Twilight's magic forced the precum to plump Dashie's poor balls out against their snug sleeve, and left Dashie's package at last… pausing only to tighten down the ring again.

Dash choked at the tightness of it, then again as Twilight brought a hand up and  slid a finger beneath her collar to pull her backward. Twilight’s other arm wrapped around Dashie’s torso as a pair of hefty alicorn breasts squished against her shoulders. Dash could feel her heat, could feel the burning, slick wetness of precum sliding down her back as Twilight’s engorged member thrust gently between her flanks.

        “A collar for your cock!” Twilight purred delightedly, her lips barely an inch from Dashie's ear. She tenderly pulled on the ear with her teeth when Dashie reflexively twitched it, and then tugged a bit tighter on Rainbow’s real collar. The pegasus grunted, her every muscle tensing up at once. “Just to show that it belongs to me, right Rainbow?” She nuzzled against Rainbow’s shoulder, smelling her, tasting her. “Just like the rest of you?”

        Dash shuddered and opened her mouth wide, curling her tongue but unable to speak or make a sound. Her cock still throbbed, but the feeling was...tighter. Focused. Intense. She clenched her crotch muscles, and moaned aloud as the searing, pressurized sensation of it all sent her spine twisting and her chest heaving.

        “That’s a good little pet,” Twilight whispered. “Not a drop of cum.” Dashie whimpered, feeling her balls swelling, sloshing, as her cock was constricted tighter and tighter by the second.

        Out of the corner of her eye, she saw Twilight’s pointer finger move in a small circular motion. “On your rump, Dashie. I need to make sure that my pet tastes good enough to fuck.”

        Dashie nodded. Meekly, she turned over onto her rear, sitting on the bed and letting her legs dangle over the side. A pair of modest breasts—no more than a B-cup—sat unobtrusively against her chest, and her swollen cockhead smeared any last droplets of precum against her belly.

        She half expected Twilight to kiss her again, but instead, her master knelt down onto the floor, knees squishing atop the soft carpet. “Mm,” Twilight murmured, eyeing Rainbow’s bobbing cock lustfully. “I see you’ve gotten nice and hard for me. Wouldn’t you say?”

        Rainbow swallowed dryly as she watched Twilight’s eyes sway back and forth in time with her cock. It was almost hypnotic, especially combined with the even, sultry tones of Twilight’s voice. “Y-yes,” she said. “V-very hard.”

        “Mm-mm.” Twilight leaned a bit closer. Her muzzle was barely an inch from Dash’s tip now, the thick, curved flare bobbing desperately just beyond her reach. “Let’s just make sure that our little collar is doing its work.”

        And with a bob of her head, she let her lips open wide—and slip over the sides of Rainbow’s cock. Dash gasped, her thigh muscles locking up as Twilight’s tongue swished along her underside, its warm wetness like a perfect cunt around her length. Dash pumped her hips—or tried to, finding instead that her hips were held down by the earth-pony strength of Twilight’s steadied arms. Dashie whimpered, her cock’s arousal pulsing like a lighthouse with each shift of Twilight’s tongue or cheek against it. She could feel her heavy balls swelling, pushing against the insides of her thighs, squishing beneath Twilight’s chin each time the other mare took her full length down her throat—but with every swallow, the pressure only grew worse.

        Dash actually gasped as Twilight pulled off her cock, a cascade of unpleasant shivers tap-dancing their way down her spine. A sheen of saliva around her organ’s length was the only kind of moisture present; even as she felt her cock harden even further, until it felt like a rock attached between her thighs, Dashie felt not a single drop of precum ooze from her slit. She whimpered again, her dry spell becoming all the more torturous as she watched Twilight lick up a long, thin strand of saliva connecting Dash’s tip to her lips, the motion at once lustful and promising.

        “Now,” Twilight said with a peremptory sniff. Her hands slid down to Rainbow’s thighs, groping and holding, owning her body’s space in a way that even their normal sessions could never hope to approach. “I hope you’re ready, Dashie. Because I’ve gone to the trouble of getting myself nice and hard for you, and I want to make sure you appreciate just how full I’m going to make you feel.”

        “R-ready,” Dash panted. “P-please, master.”

        Twilight’s teeth nipped playfully at her ear again, and Rainbow groaned. “Hold still, Dashie,” Twilight whispered. “Be a good broodmare for me.”

        Dash felt Twilight’s flare first. It was a thick, curved surface, her bulbous head smooth and just barely ridged along the edges. It was so wide, too—wider than any stallionhood she’d taken on her own; wider than she could believe she could take. But she was wet enough, and Twilight’s precum gushing in such volume that letting Twilight slip inside wasn’t going to be a problem. The problem, she realized, was making it fit.

        With a grunt, Twilight shoved her length inside. Rainbow Dash gasped, her throat constricting as if her collar was holding her very lungs hostage. Eyes wide but pupils unfocused, Dashie let out a series of thestral-like squeaks, trying (and failing) to squeal as her cunt was forced wide open, her dripping lips spreading wide as her body accepted its throbbing invader. Both of Dash’s hands went up to her breasts and squeezed, clutching onto her tender titflesh like a lifeline as Twilight possessively kneaded at her thick, corded thighs.

        “You’re too hard,” Twilight grunted. Rainbow groaned as Twilight pulled back, leaving her sopping cunt needy and empty. Twilight thrust forward again, and all of Rainbow’s muscles clenched as one, clinging to her master's dick for dear life. She gasped, her core burning with fullness.

        “Too rough,” Twilight added, her chin digging deep into Rainbow’s shoulder. Unable to touch herself between her legs, Dash’s hands moved up over her breasts. Her nipples were hard, her cleavage sensitive. Fuck. She needed this—needed Twilight to leave her feeling full, feeling satisfied.

        “M-more,” Rainbow whimpered. “H-harder.” Twilight—her master—would like it if she whimpered. That would mean she was breaking. And she wanted to break, didn’t she? Wanted to let her master know just how badly she needed to be rutted.

        “Harder? You little slut.” Twilight slammed their hips together, and Rainbow’s head arched back, her tongue lolling out of her mouth. Twilight’s moans mixed with her own, the alicorn’s panting overlaying Rainbow Dash’s own pathetic, needy noises. Twilight leaned in close, her voluptuous breasts spreading out across Rainbow’s back as she grabbed her marefriend tight around the belly. Rainbow groaned as Twilight bottomed out inside of her. Her wings reached back, feather-light touches begging and pleading for—what? Dashie didn't know.  More, probably. Always more.

One of Dashie's hands slid over Twilight’s, as if to feel the swell of Twilight’s cock against her stomach. Her core ached with fullness, but—somehow—even that wasn’t enough.

        “Yes,” Dashie panted. “I’m a slut. Please—“

        “Please what?” Twilight said. When Dash fell silent, Twilight thought for a moment while she grabbed Rainbow's hair in one hand, pulling her up slightly.  With subtle pinches, she traced her fingers in a circle over Rainbow’s abdomen, testing her hardness; finding it wanting. “Could it be that this prime cut of a pegasus wants to be filled up with cum? That this Wonderbolt wannabe knows that she’s nothing more than her master’s cumdumpster?”

        The words stung—but that made her loins burn all the hotter. Swallowing, Rainbow felt her lower lip tremble when she said, weakly, “No—I mean—“

        “I think you know exactly what you mean,” Twilight purred. She nuzzled Rainbow’s cheek, then jerked her hips forward. Rainbow let out an “ah!” of surprise, her ass pushing solidly back against Twilight’s thighs. Twilight purred with delight, her hands coming up to grope at Dash’s tits, her fingernails teasing the broad areolae.

        “You want me to make you nice and soft,” Twilight murmured, hands wandering, demonstrating where curves could be.  Should be.. “Feed you every day with enough cum to round out some of these curves.” Her fingers played across Dash’s waist, and she began to thrust in and out regularly, the gentle schlick-schlick of her member hypnotizing Dash’s body as it rubbed against her folds. Dashie groaned, losing herself less in the sensation than in the fantasy Twilight was painting her.

        A disdainful sniff.  “The athlete’s figure will have to go.” Twilight’s deft fingers found Rainbow’s flat, toned tummy and squeezed it. Dashie clenched her thighs, her teeth gritting as she fought back her ego. “You won’t need to work out anymore—a pet like you can get all of the ‘walks’ she needs with a good, daily rutting.”

        A sudden sting spread across Rainbow’s flank as the ringing, painful sound of Twilight’s slap! Echoed in her eyes. “Nuh-uh,” her master told her. “What’d I say? No touching.”

Rainbow’s eyes stung. Trembling, she withdrew her hand from her aching cock. Oh, but it hurt—it was so tight. She could feel it begging her, pleading with her to touch it, to release it from this half-pleasured agony and the tight grip of master's magic. But she would do as her master said, even if she longed to rub and soothe the angry red spot where Twilight had just spanked her.

“Bend over,” Twilight commanded her. She rubbed Rainbow’s other flank—the unspanked one—and clutched the pegasus tighter to her chest. “I want you on your elbows and knees, like a proper pet. You’re no good to me if you can reach your stallionhood like a proper pony.”

Dash’s cockring was painfully tight, her erectiong growing particularly stiff at Twilight’s words. But she obeyed, crawling to her hands and knees as Twilight smoothly slid on top of her. Here, she could feel Twilight’s testes pressing weightily against the backs of her thighs: a pair of heavy, smooth orbs that she was sure were absolutely full of cum.

Her elbows trembled as Twilight moved on top of her, but Rainbow was proud that her stance held. “Now,” Twilight murmured, steadying herself arrogantly with her off elbow carefully placed to avoid Dash's sensitive wing muscles, her hand curled under her chin. “Where were we?”

Twilight smirked. “Oh, right!” She turned, grabbing Dashie's side and thrust her member forward, impaling Rainbow Dash on her impossibly hard erection once more. “We were talking about just how good a cumslut you’d make. Would you like to hear about that?”

“Y-yes.”

“Great,” Twilight said happily. “Oh, it’d be just perfect! Taking you out for walks, right in the middle of Ponyville. You’d need a leash to go with that collar, of course, leash laws and all”—Rainbow grunted, her muscles clenching up as Twilight began to thrust into her regularly, the rhythmic slap-smack of her marefriend’s enormous balls against her thighs writing a symphony for her libido—“and a good set of revealing clothes, especially once your belly and boobs get big enough to start poking out.”  Twilight wriggled her pulsating dick in Dashie's body, shaking her by extension.  "Gotta show off what's mine, right, cumdumpster?"

Rainbow Dash bit her lip, swallowing a gasp. Oh, fuck.

“Nice and chubby, I think,” Twilight went on, a smug half smile on her lips. “We’ll have to put you on a cum-only diet. You’d like that, wouldn’t you? More than enough protein to make your curves soft and”—she grabbed a hefty handful of Rainbow’s ass—“squeezable. And even pets have to sometimes be fed in public. Why, I think I could imagine the two of us sitting in the middle of Sugarcube Corner, and you catching a whiff of my crotch, and just begging to be fed. Maybe I’ll stuff my cock down your throat and feed you a snack of cum, or orgasm all over your fur and let everypony see just how much you belong to me.”

Dashie’s breaths were growing labored; she couldn't seem to shut her mouth and her tongue lolled about with a mind of its own. Twilight’s lewd thrusts were growing more forceful by the second. Rainbow’s loins burned, her core throbbing, clenching in time with Twilight’s cock as her own stallionhood flexed and cringed at the tightness around it. She needed release, could feel it coming, could feel herself peaking, but without any way to go over—

“Maybe I’ll take you out to see the Wonderbolts,” Twilight grunted out, “and show off my new pet to Spitfire and Soarin’. Maybe I’ll let them use you, maybe in the locker rooms, or give you a ‘walk’ in the middle of their show. I’ll keep your cunt to myself—and your chunky, cum-stuffed ass is all mine. But you’ll be a good little filly-pet, won't you? You’ll let Soarin’, and Spitfire, and every one of the Wonderbolts, and every member of the audience unload every ounce of their cum down your throat until you’re round and sloshing and fit to burst—“

Rainbow Dash choked on the image, on her lust for it, the swell of her orgasm reaching a peak. Dashie's cock lurched—and stopped, its rock-hard swell stopping as it ran up against the confines of her suffocating cock ring, the heat trapped in the sheath's confine. Her girth throbbed, her balls churning angrily with their unspent seed.

Twilight's stallionhood, though, held no such hesitation and would be confined by nothing. She bottomed out inside of Rainbow with a victorious cry, her spasming member shoving rudely past Rainbow's surrendering, wet sex. Dash gasped, her spine arching as she felt her cunt bend around the curve of her master's cock. Each spasm of Master's shaft, the shaft that owned her, along with each throb of Master’s flare rubbed roughly against Dashie's dripping walls, sending her feminine parts on a climax of their own. Dash twisted, gasped, heaved, as each twist of master's member sent thick ropes of spunk splattering against her velvety insides. She moaned, her voice mixing with master's, as she felt her marehood—and, in her mind, her womb—filling up with her stallion's, her master's seed. She felt herself surrendering her insides entirely to her master, exposing herself, becoming the other mare's property in the most primal way as Master growled and snarled with pleasure.

Slowly, the tide of jizz stopped. Dashie groaned again, her hand going to her belly as she felt Twilight's load slosh inside of her. Grunting, Master dismounted, her still-throbbing cock sputtering a few more strands of spunk over Dashie's ass before the two collapsed onto the bed together.

Dash's eyes squeezed shut. She bit the inside of her cheek, struggling to keep her hands from ripping that cockring from her tip. She felt so cheated—angry, powerless, submissive. And yet it made her feel all the hornier—each drop of denial, each grunt of ownership. So she lay there, whimpering, her engorged cock throbbing as the cockring bit deep into her erect member's flesh, her sore, overfilled balls laying heavily against her thighs.

Twilight grunted happily. With a twitch of her legs, she wrapped her thighs around Rainbow's hips, pulling the smaller, lighter mare against her own larger frame. "Now doesn't that feel good?" she murmured, stroking Dash's cum-filled belly with the tips of her fingers. "Don't you like being filled with your master's cum?"

Dash whimpered, louder. "Y-yes." She fumbled for her master's fingers, found them. Twilight allowed her to wrap their fingers together—so long as she wasn't touching herself, Dash decided, or trying to push her master to the bottom, she could do whatever she pleased. She almost said she wanted to cum...but "Dashie" decided not to anger her master by speaking out of turn. She stayed silent, and listened to the gentle gurgle of cum in her womb.

"Mm." Twilight kissed her on the cheek. "Are you wondering if I got you pregnant?" she asked. "I can feel your labia winking against my shaft." Her erection—still, somehow, rock-hard against Dashie's loins—gave an excited twitch. "It's long past time I put you out to brood, though. Maybe you're wondering how my foals would look—or just how big and round you'd get with my offspring inside of you."

Twilight moved her hand to the top, squeezed their fingers together on top of Dashie's stomach. "Maybe I'll show you off," she teased, nuzzling Dashie's side. "Let everypony see just how wide your hips are getting—how thick your thighs get. Maybe I'll share my pet around once her slutty breasts get big enough to milk. Though I'm sure you'll need plenty more feedings—lots and lots more cum, so that you can feel properly full. So you can feed my foals, right?"

Dashie moaned weakly. Her cock gave a finally twinge of discomfort against its confinement, bobbing at her thigh.

Twilight giggled. "But," she said, "you hardly look presentable like this." She dragged a finger across Dashie's hip and came away with a dripping glob of her own spunk. Giving it a sniff, she giggled again and added, "I think I'll need to give my pet a wash. Can’t go around town with you looking like this, right?"

Dashie nodded. Twilight kissed her again, then slapped her on the rump, making it jiggle, just slightly, but with promise.

"C'mon," Twilight said, hopping off the bed. Her member slapped wetly against her belly, more than long enough to brush against the underside of her F-cup breasts. "I think it's time for my cute little Dashie to get herself clean."

Rainbow Dash's mind was clouded in haze as she followed Twilight to the bathroom. Her thoughts moved sluggishly, burning with lust. She stumbled through each step, gasping each time her over-filled balls slapped against her thighs. She could feel their contents sloshing—could feel those spunk-bloated spheres groaning with a desperate need to unleash their load.

Each step brought her engorged cock slapping against her abs, the sheath feeling obscenely tight, her belly only marginally softened by the torrent of cum Twilight had dumped into her. Twilight's own sauntering step mirrored her unsteady gait perfectly, the taller mare's erection swaying alluringly in front of her. Dashie could see it bob each time it swung to the side of Master's round, flaring hips, its tip oozing a steady stream of precum onto the floor. The sex-soaked carpet squished beneath Dashie's bare feet as she followed, her stallionhood throbbing even as her marehood cried out for further release. She might not have had a physical one, but she felt as anchored to Master's movements as though there'd been a real leash attached to the one around her neck. Every step, she wished there was.

The hot steam of the shower hit the bathroom mirror with a hiss, thick clouds of mist clinging to Master and Dashie's every curve. Dashie blushed as Master stepped toward her, the door swinging shut behind them.  Dash almost didn't notice it when her master's horn flared once, and the sheaths trapping her package disappeared, the trap of the cockring too overwhelming yet.

"You're looking delicious, Dashie," Twilight said. Her horn glowed, and Dashie groaned; her taut, supple breasts throbbed with sensitivity as her master's magic caressed and groped them shamelessly. Her master's cock flexed, and a thick jet of precum—larger than most stallions' orgasms—spurted out to cover Rainbow's bust. The pegasus grunted, her eyes fluttering shut as Twilight spread the sticky liquid across her pert, plucky tits.

"I gave you a compliment," Twilight said bluntly, after a moment. Dash opened her eyes, letting the humid air wash over her, and saw her marefriend—master looking down at her with her head tilted. "Aren't you going to thank me?"

"Th-thank you, mas—" Dashie sucked in a breath. She felt her whole body cringe, not in pain, but in a wracking, alien pleasure. Her cock shuddered, her hips twisting against empty air as her master's telekinetic grip squeezed its way up and down the contours of Dashie's shaft.

"—master," Dashie wheezed. She hugged her hands to her chest, suddenly feeling very naked as her flare brushed against the backs of her palms. Master smiled at her, not unkindly.

"Much better," she said. "You know, you're looking awfully pent-up there, Dashie. Think you'd like to have some release?"

Dash's gaze shot up. Excitement flared within her chest. She didn't even have to fight to stay submissive this time—so deep, so pure had the shift to "Dashie" been. Their chosen word lingered in the back of her mind, but she shoved it back down with a hidden, triumphant grin. She'd almost made it. Her cock throbbed, a pathetic glob of precum welling up in her slit as the light at the end of the tunnel approached.

And then, with an inferno of sensation, the light rushed over her in a torrent. Dashie gasped, a ragged "F-fuck" tearing its way from her throat as Master nudged the cockring up toward the top of her flare. Dashie's eyes opened wide, and her balls swelled with eager stores of seed.

Twilight giggled. "Eager, are we?" She stepped toward Dashie, slung an arm around her shoulder. "Let's not go off too easily, though," she purred, stroking Dashie's bulbous, engorged flare with her knuckles. Dashie shuddered, and nodded weakly. "After all, I'm still ready for more myself, and I know you'd just hate to disappoint me, now wouldn't you?"

"Yes, master," Dashie whispered. Seizing the initiative for the first time, she ground her ass slightly against her marefriend's—her owner's—crotch, reveling in the sense of slutty submission. Behind her, Master groaned; the alicorn's magnificent stallionhood throbbed mightily as it rubbed between Dashie's asscheeks, another hefty splurt of arousal painting Dashie's neck a dripping, milky-white.

"Good filly," Twilight gasped. She thrust her girth upward, and Dashie groaned, her weighty balls slapping hard against her thighs as the motion rebounded. Breathing hard, Master steadied her grip on Rainbow's shaft, just beneath the cockring. "Now, just hold still..."

Dashie didn’t feel the cockring move so much as a sudden, overwhelming sense of release. She didn’t cum, but she felt herself unfold, expanding, as though her entire crotch was sucking in air all at once. She gasped for breath, stumbled—and found herself in her master's—in Twilight’s arms, her cheek pressing against the larger alicorn’s bust.

“Better?” Twilight said.

“Oh, f-fuck.” Rainbow Dash groaned, swivelling her hips. The tip of her engorged cock brushed against Twilight’s navel, and Dash let out a low, throaty moan. “Y-yeah. Much.”

“Good,” Twilight said. With a flicker of magic, she swung open the shower curtain. “Well? Go on.”

The second Rainbow stepped into the shower, though, she felt a presence move in behind her. She’d expected to be in there alone—but after a few moments of blinking stupidly for the soap, a pair of warm, strong hands pushed beneath her armpits to grasp at her breaths. Rainbow gasped, her erection shuddering as Twilight let the shower curtain swing shut behind them, the rings clattering lightly as steam filled up the enclosed space. Dash’s gasp turned to a soft moan, her ass clenching as Twilight’s cock grinded up against it, her own shaft flexing at the light touch of Twilight’s knuckles. The two groaned together, the hot water cascading over tense shoulders, rivulets of bubbling steam washing their cum-stained coats clean.

But there was still a plentiful amount to come. As fast as the water washed it away, the two mares' stallionhoods made up more than enough precum to keep their surfaces slick and lubricated, even under the scalding, steamy torrent. Twilight waited no more than a second before sweeping Rainbow up in a kiss, their wet bodies pressing close together as their breasts squished and jiggled.

Rainbow groaned, letting Twilight guide her into the kiss. The environment had changed, yeah—but until Twilight said that she wasn't, until she was at least allowed to cum, she was still Twilight's pet. And so Twilight led the two of them, her greedy, eager tongue wrestling with Rainbow's as their lips pressed closely against one another.

Every inch of Rainbow's body, it seemed, was Twilight's to explore. Slender fingers squeezed Dash's tapering waist, kneaded her toned, muscled ass. One finger slipped its way between Rainbow's cunt and balls while Twi's thumb pushed against Rainbow's hidden moistness, squishing the overloaded spheres against Dash's thigh as her nuts sloshed and swelled with seed. Rainbow gasped, her whole body going erect as Twilight played with her sensitive crotch. Her cock, overjoyed its freedom, flexed and jerked with her hips, splattering Twilight's expansive bust with enough precum to match a full orgasm.

"Mm-mm," Twilight said, licking her lips as she pulled away. A dab of precum had splattered her chin, and she lapped that up before the water could, taking obvious pleasure in swilling Rainbow Dash's seed around in her mouth. "My pet tastes very good. I wonder how she looks when she's nice and clean."

Their thighs rubbed together, hips swaying and squeaking as the hot water cascaded upon them. Dash groaned, her cock throbbing as Twilight's larger erection frotted against it. Rainbow's was thicker, harder with lust and need, but Twilight's was longer. Where Rainbow's came up only over the top of her six-pack, Twilight's was nearly long enough to fuck her own tits. That had been inside of her, Dashie thought, her lip quivering as she felt Twilight's pre-slick flare brush against her own bust, that waterfall of arousal concealed from the shower by the shield of their bodies. She'd taken that—all of that. She couldn't help but feel a little proud at that fact, even as she felt the final amounts of Twilight's load dripping out from the swollen lips of her pussy.

"You'd have to be clean for the Wonderbolts, of course," Twilight went on. Dashie's lips trembled; her eyes fluttered shut. Her every muscle felt on edge, her whole body primed to go shooting up into the stratosphere. Her wings, clenched shut behind her, trembled along with her, her feathers rustling as rivulets of hot water streamed down their bristles. "I can't show off a pet who's anything less than perfect. Although"—Twilight's lip curled, and she wove a hand through Dashie's mane, forcing her head slightly back—"I can't say you'd be clean for long after."

Dashie felt another throb of arousal. "Oh, no," she wheezed. She swallowed, felt the collar pressing against the fur of her throat. "Fuck no, master."

Twilight slapped her on the ass. In the steamy wetness of the bathroom, the sound faded almost immediately—but the droplets of water cascading from Rainbow's jiggling rump were hardly invisible. "Mouthy," her master said coolly. "Crude. But..."

She raised an eyebrow, and smirked. "But eagerness isn't a crime." Tenderly, she brushed a strand of hair out of Dashie's eyes. "Tell me, pet. What would you do for the Wonderbolts?"

"Whatever they—you wanted me to do," Dashie said. Belatedly, she added: "Master," and blushed.

"Such faith," Twilight giggled. She pressed her weight forward, trapping Dashie against the cold tiling of the shower. Dashie shivered, her cock throbbing as Master's larger member pressed it into her belly. "So what would I have you do, then?"

Dashie bit her lip. Master's great, heaving breasts entranced her, their plush, round curves so much heftier than her own. She reached her hands around and grabbed her marefriend by the ass, letting Twilight's rump squish out between her fingers.

"I think I'd let them walk you," Twilight purred. Her hips pumped against Dashie's, frotting their cocks together at higher speeds. "I can see it so well, too—Soarin', the leash in his hand as you get down on all fours in front of him. Maybe Spitfire, forcing you to eat her out in the middle of a show—a captain needs release, after all. Maybe I'll have them suck you off, and use your balls as refreshment."

Dashie groaned. "Please..."

"I can see the crowd cheering, you know," Twilight murmured. She walked her fingers up the wall, spiderlike, as the hot water splattered against her back. Dashie shied back, her eyes fluttering shut as her own breathing grew labored. Their hips heaved and jerked together, pumping their erections against one another as both mares' balls slapped loudly together. "With the words 'property of Princess Twilight Sparkle' written on your ass in my seed, though, nobody will forget who you belong to. No matter how many stallions or mares you service, no matter how many ponies I let fuck you, you'll always be mine to fuck, mine to use, mine to walk, to own, to fill you up with cum and foals until your womb is so big you're ready to burst."

Dashie gasped for breath. "Please—" she begged, whimpering. "Twilight—master—please—can I—"

"Cum for me, Dashie," Twilight grunted. "Now."  Her master demanded it harshly.  Her marefriend gave it lovingly.

The freedom of that word was electric. With a final gasp, Dashie reached her peak. Her hips jerked forward, slamming against Twilight's. The motion of it sent her balls smacking against Twilight's own. The impact only made her oncoming climax even more intense, her eyes rolling back as her muzzle opened up to gape into an inferno of pleasure.

Hot, thick ropes of spunk, each one nearly a half-cup in volume, fired off from her spasming shaft. The throbbing and motion of it sent Twilight's orgasm off as well, and soon the two mares were cumming together, each one gasping and jerking in turn. Twilight's load painted Rainbow's face white, layering her bust and cheeks with stripes of heavy, musky cream, but Dash's orgasm, long-since restrained and suddenly released, was absolutely explosive.

Massive jets of spunk fired up toward the ceiling, sticking to the paint before dripping slowly down the shower tiles. Cum-bloated orbs the size of oranges fired off volleys of jizz, each glob of cum thicker, larger than the last. Rainbow Dash felt her shoulder blades press up against the wall, her hips pushing out as her thrusts gave her fat cock enough room to properly unleash its load. Her huge balls slapped against her thighs, then Twilight's, then her thighs again, each impact milking her impact longer, the grind of Twilight's climaxing shaft against her own sending her soaring upward into a musky, cum-splattered ascent.

And then, after a good twenty seconds of cumming, it stopped. Rainbow Dash gasped for breath, and let her body fall flat against the tiled shower wall. Before her, Twilight was breathing hard; with a flicker of magic, the shower shut off behind them. The sound of dripping water echoed in the steam-filled bathroom, both mares panting as sweat dripped down their chests.

Rainbow Dash broke the silence first. "F-fuck," she breathed. "That was—fuck, that was intense."

"Intense?" Twilight looked up, and then broke down giggling. Her rosy cheeks flushed, and she pointed at the ceiling, burying her face in her palm. "You repainted the ceiling!"

"Oh." Dash blushed, then spared a glance for her flared member. A thick strand of jizz still clung to the side, its beginning sliding deep back down her slit. "Heh. Whoops."

She took another deep breath, and then felt a wave of exhaustion crash over her. She stumbled, and Twilight caught her, holding her tenderly in both arms.

"Hey,” Twilight cooed. “Hey, Rainbow. You did great.”

Dash blinked blearily up at her. “Did I?”

“Oh, gosh, yes,” Twilight said. “You were the best pet I ever had.” Still blushing, she leaned in, and planted a kiss on Rainbow’s cheek. “And still are the best marefriend.”

        “Heh.” Rainbow smirked weakly, as Twilight’s hands went to work massaging her shoulder and side. “Being a pet is a surprisingly hard life, it turns out.”

        “Oh, I hope I wasn’t too much—“

        “Not at all.” Rainbow Dash rolled her eyes, then gave Twilight’s ass a squeeze. Time for some words of Rainbow Wisdom. “You were great,” she said. “We should try this again sometime.”  Nailed it.

        “I’m just happy it went so well!” Twilight nuzzled her cheek gleefully, her horn lighting up as Rainbow’s collar clicked open. “Oh, I was afraid that the ring might be too painful, or that I might have been too mean—“

        “You were great, egghead.” Dash nuzzled her back, then planted a peck on her lips. Twilight accepted it happily, pulling her in until it was a little bit more than a peck. Then…

        Dash let her pull back, and sucked in a breath. “Although,” she said, looking amused. “I’m not sure why you turned the shower off.”

        “Oh?”

        “Well...” Dash glanced down at the space between them. She saw Twilight follow, and then looked up. Twilight’s lips parted, her eyes widening as Rainbow’s creamy load oozed down the walls around them. A particularly fat glob splattered onto Twilight’s nose.

        “Oh,” Twilight said. She giggled, then gave Rainbow another hug, their cum-covered breasts squishing together. “Oops.”

        “Egghead,” Dash said affectionately. She gave Twilight’s butt another squeeze.

        “Maybe next time you should be in charge,” Twilight said. “Just so you can remind me not to miss silly things like that.” Her horn glimmered, and the splatter of spunk on the ceiling found itself wiped cleanly into the toilet. The rest of the jizz on them, though…

        “Maybe,” Dash said. She smirked, and licked a stripe of cum off of Twilight’s cheek. She tasted it, swallowed it, and smiled. “Just maybe.”