The constant, calming sound of falling water resounded in Rainbow’s ears. Standing in her shower, she hung her head down and allowed the cool droplets to cascade down her sleek form. Her mane clung to her body, damp from the strains of water pouring onto it - colors still vibrant as ever. She took a deep breath, finding herself struggling to stand, struggling to focus, struggling to resist.

She always hated being in heat.

“B-buck…” she groaned, slowly shifting in place.

She had gotten into the shower in a feeble attempt to cool herself off, to distract her from this stream of carnal need flowing within her. Never, and she meant never, had she ever had it this bad. The aching in her nethers screamed to be sated, and she despisedevery bit of it. She was a proud pony, and without a doubt the coolest one in all of Equestria - so she claimed, but even she found it nearly impossible to resist the callings of her inner nature. No matter how often she inflated her own ego, whenever she entered heat, she was no better than the average mare.

Another strong surge of primal delight flew through her body, the itch within her begging to be dealt with. Her legs quaked, while she released a quick, sharp gasp. The shower did nothing to help, her estrus was still as intense as ever - hell, it may have even gotten worse. Sighing in defeat, yielding to her body’s needs, she sat down in the tub. The need was too much even for her, she simply had to get off. Furling her aching wings, the feathered appendages desperate to spread out stiff from her arousal, she leaned back. Now laying down, finding herself awfully snug for the hard surface she laid on, she drew a deep breath, attempting to compose herself for what she was soon going to do.

It wasn’t a foreign concept to her, but yet she couldn’t help but always hesitate at the prospect of masturbating. It felt below her in a sense, being her own ego told her she should be able to resist her own marish needs. Though, much to her spite, the truth was she couldn’t bear the desire dwelling within the devious depths of her mind. The sensation of estrus was one any mare knew - first a slight ache, then over time a roaring fire of what feels like unquenchable need.

Feeling the cool water flow over her, running from her chest down to her small, perky tits, she moaned lightly as she felt her pussy wink. Her nipples had gone erect, finding themselves stimulated by each enticing droplet of water that splashed against them. She briefly stared at her own bosoms, taking in their current form for a moment. She may have had some insecurities about their size, though she’d never admit such, but they still were as sensitive, perhaps even more, as any other mare’s rack. Taking her attention away from her own teats, she trailed her vision down further, now gazing at her tingling groin. Her thighs were pressed together in a pitiful attempt to conceal her own arousal from herself, but she knew there was no point. Parting them, keenly aware of the string of her own lustful juices connecting her inner thigh and gushing folds, she took a deep breath and took note of her current state.

There were few times in her life that she could recall being this wet, and she felt rather sure this was the worst she had ever been. The heat in her abdomen was growing with each passing moment, clashing against the cold water running along her. The mixture of hot and cold only setting her further down the path of desire, she released a soft moan as the sensations began to overtake her. Admonishing herself for allowing her instincts to drive her to such a point, she slowly but surely moved her hoof down towards her snatch.

“Just…gotta get rid of it for a bit…so I can focus…” she attempted to reassure herself.

She could form as many excuses as she wanted for what she was about to do, but she couldn’t deny the thoughts that ran rampant in her mind. Deep down, she loved to play with herself. The rush of committing such a lewd action, the buildup of pleasure, and the amazing climatic release all pieced together for something she always found enticing in the grand scheme of things. It was always something she hated building up to, finding the demeaning thoughts accompanying it damaging to her own pride, but loved performing.

It was an act that let her thoughts run wild, where they’d delve into the inner desires she had. Each time she pleased herself, her imagination would create detailed images in her head; ranging from taking a stud’s cock deep down her throat, or even thoughts of being properly bred, carrying the foals of the stallion that claimed her. She may adorn the facade of a constant tough mare, flaunting her skills and tomboyish personality, but deep down she was still just a mare, a mare that instinctually wishedto be bred.

Her vivid imagination was always amplified whenever she was in heat. She’d get swept away in lewd thoughts, each and every time. She’d always find herself delving especially into thoughts of being filled with a stallion’s seed, fulfilling her natural role as a nice, breedable mare. Oftentimes these thoughts contained studs she was familiar with, much to her hidden excitement. A handsome, talented one like Soarin; a fit, muscular stallion like Thunderlane; or even a sweet, kind guy like Quibble Pants. Her mind would always find each one of them more than ideal to give her foals, plowing her senseless and filling her to the brim with their seed, and she hated the fact that she loved it. Her ego always clashed with the action of pleasing herself, especially due to the thoughts that came with it, but more often than not she still gave in - and when she gave in…

She indulged herself like a complete and total slut.

Shifting the thoughts in her mind to action, she inched her hoof closer to her cunt. She couldn’t help but stir with excitement as she moved closer to her marehood, knowing full well the euphoria she was about to grace herself with. Finally reaching her goal, gently pressing her hoof against her engorged folds, she gasped. Upon making the slight contact, a wave of pleasure rode through the prismatic mare’s body and, pressing slightly harder against herself, it pushed her to releasing a passionate moan.

She lay dazed for a moment, processing what just occurred through hazy, lustful thought. If the simple act of touching her needy, lower lips caused her to feel such enriching sensations, actually pleasing herself could quite possibly lead her to something beyond her imagination. Applying a bit of pressure to her marehood once more, feeling the same wonderful surge of pleasure, she snapped. Abandoning her reservations, with the eagerness of a dirty whore, she furiously rubbed her own snatch.

“Ooooooooh yessssssss ~” she groaned, throwing her head back in ecstasy.

The torrents of pleasure coursed through every nerve in her body, forming into an aura of lewd nirvana all throughout her. She had no idea why this heat of hers was so intense, dwarfing every other one she had ever experienced by a country mile, but she didn’t care - all that was on her mind was getting herself off. She needed it, her desires too strong and too distracting for her to compose herself any longer. She didn’t care for her own pride, the pleasure she was experiencing overcame any concept of her own highly maintained ego for the time being. She had dove into the depths of her lust, and now she was fully embracing the pleasures that came with it. Picking up her pace, her vivid imagination running wild, she hung her mouth open while motioning her tongue, finding herself embracing the thought of servicing the cock of an imaginary stallion.

“Mmmmm~ Ahn! Aah!”

She put her hoof to work with furious speed, pressing against her gushing folds with intent to push her to a climax. Groaning to herself, she took her free forehoof and guided it towards her abdomen, now rubbing her sensitive bosoms. She pressed against her erect nipples, causing spikes of pleasure to flow in her with each movement. The action on her perky breasts complimented the pleasure her masturbating gave, throwing her into a realm she never had once felt. It was unnaturally good - she couldn’t describe it, nor could she comprehend it. She allowed herself to be enveloped in an endless sea of lust, and there was truly only one way out of it.

“F-fuck yessssss. You’re such a dirty slut,Rainbow~” she moaned, lolling her tongue out, her imagination now shifting to the thought of lapping at a stud’s package.

Throwing her hips upwards, humping the empty air before her, she continued to fool with her nethers. She shifted her efforts to her engorged clit, which sent her thrashing with pleasure in the tub. Openly moaning like a self indulgent slut, she came to an acceptance - she really loved how good this felt. This heat was a damn curse to her, but with it elevating her pleasure beyond what she normally felt possible, she felt a semblance of gratitude for her biology’s actions. With each euphoric second passing, her pleasure only continued building up, and she felt her climax coming ever closer.

“Nghhhh - a-almost there…” she panted, biting her lip as she felt her orgasm rising within her.

Among her cries rang a sharp, loud tone, something akin to an emergency alarm of sorts. Eyes going wide, she recognized the blaring beep spawning from outside of her bathroom. Much to her dismay, the all too familiar, and awful, sound meant one thing.

Pausing her efforts, grimacing in rage, she spoke with contempt, “Mmmmph!S-seriously!? Now?!”

For the last few months, she had been tasked with acting as a “Guardian” of sorts in Manehattan - well, she kind of coined the term herself. Princess Twilight had informed her a while back that the city’s law enforcement unit had ended up being entirely corrupt, from top to bottom, inside and out. Being this, an entire restructure of their police system would be needed, but, due to that, nopony would be around to at least handle the large problems the city faced. Ultimately, after some pressing, Rainbow had managed to weasel out a request from the mare. The city did need somepony to take up the mantle of an enforcer of sorts, and it had immediately caught the pegasus’ attention.

Offering to take some time away from home, to better serve Equestria, she opted to be the one to handle any issues in the area. With the Wonderbolts being in the off-season, and the rest of the Elements being less than likely able to cover the task, due to their work life or simple inability to meet such a task, she felt she was the best option for it. She wasn’t exactly sure why she had offered to do it so quickly, be it her drive for action, her needing to find an escape from her boredom, or a mixture of the both, but she had.

It had only been about two months since she had begun this vigilante-esque job. She did miss seeing her friends nearly every day, but they still visited the city frequently, and besides, she absolutely loved the attention and praise she had been receiving here. Fending off robbers, goons, and even the occasional real supervillain, which Rainbow thought really only existed in comics, led the citizens of Manehattan to soon hoot and holler about their newfound prismatic savior.

After some time, she had fully taken in the praise of those around her. Though she wasn’t as showboat-y like she was back in the Mare-Do-Well days, she had gone far enough to acquire a superhero costume of sorts to fit her role. Truthfully, what is a hero without a totally cool outfit? She could look cool, be cool, and create a spectacle of herself all at once. Honestly, it was a gig that was right up her alley.

Unfortunately, her newfound responsibility came with numerous, annoying downsides. The occasional scrapes and bruises from her fights were one thing, but the near constant requirement for her to help was starting to get draining. She was able to rest and sleep well most evenings, as local vigilantes handled most of the night time work, especially this one pony who dressed up as a vampire fruit bat…for some reason, but almost all her mornings and afternoons were filled with relatively dangerous work. When there was a large-scale risk at night, something beyond what common vigilantes could handle, she’d still get notified. Though it wasn’t common, she had been called a few times during the night before. Sometimes it interrupted her sleep, other times it interrupted spending time accompanying her more personal interests.

Now was one of those times, as the alarm going off in her home was the telltale sign of the city calling for her aid. Groaning to herself, knowing the situation had to be rather serious, she reluctantly removed her hoof from her winking snatch. Her release would have to wait. She had a pretty confident hunch that if she experienced the massive climax she knew was going to come, she’d probably have passed out. Sighing, she slowly stood up, rising on her shaky legs as her marehood angrily winked at nothing.

Okay, Rainbow, pull yourself together.

Shakily standing still, gritting her teeth as she felt her cunt continually seize, a concern spawned in her as she came to a revelation. She really hoped this heat wouldn’t affect her ability to do her job. The last thing she’d need is to show off her estrus whilst fighting a bunch of goons or some lowly villain. Even though she’d clobber them into next week, the embarrassment and humiliation of it all would certainly take a toll on her pride. Though she'd never let such a ridiculous thing occur, she was the Rainbow Dash after all - she could handle a little heat. Passing aside the thought, trusting that she’d be able to control herself, she slowly turned the shower nozzle. The calming sounds of water came to a close, leaving her alone with only the noise of the occasional droplet and the bustling city outside.

“Ugh - alright, let’s get going...” she sighed, doing her utmost to disregard the heat in her abdomen.

She had been so close to finally relieving herself, but, much to her annoyance, there was work to do. She made a commitment, and she had to follow through with it. She could handle a little heat, she’d faced far more intense situations in the past. Her marish desires may be calling to her, but there was no way some natural instincts could get the best of her.

“This better be actually important,” she mumbled to herself, raising her foreleg out of the tub.

Stepping out of the shower, she looked over towards her towel rack. Stretching a wing out, she winced. The appendage was still rather stiff due to her current arousal, making it obnoxiously difficult to move - nevertheless, she managed to grab a towel and pulled the rag towards herself. Taking a deep breath, she quickly ran the material over her body. Running the cloth over each bit of her, and being especially careful around her lower abdomen, she managed to fully dry herself off.

Letting out another frustrated sigh, she quickly trotted out of her bathroom and into the small living room of her temporary home. The apartment was small, but cozy - plus it wasn’t permanent, just for the time she was helping out the city. Making her way through the small living room, she entered her bedroom on the far end of the home. Her room was a bit of a mess, with her covers in a mess and some boxes of food she had eaten strewn about.

She fended off her heat for three whole days. Three whole days of desperately wanting to find release, but her own stubborn nature, accompanied with constantly being called to help, prevented her from finding release often. Being so, her room had become a mess while she had tried many methods to quench her heat. Going as far as eating ice cream and other cold foods to help her situation, all her attempts resulted in nothing. Noting that she should clean up once she returned home, having internally scolded herself for letting things get to their current point, the pegasus made her way to her closet.

Throwing the doors open, she couldn’t help but smile. Within the confines of the small wardrobe stood a single set of clothing - her costume. Try as she might, she couldn’t help but get giddy whenever she saw it. She had a costume, she was seen as a hero - how cool was that! Chuckling to herself, her joy masking her more bothersome sensations, she quickly fetched the costume off the rack. Although it had only been a few short weeks since she acquired it, she absolutely adored the getup.

Sleek, tight, and efficient, the costume was made to look cool while not slowing her down at all. Quizzically looking over the complex fabric, she pondered on a thought. She had oftentimes worried it was actually too tight, possibly even downright sexual, being it highlighted her curves a little too well, but she always dismissed the worries. Of course it had to be tight, it was meant to look cool while letting her keep her signature speed. If it were even the slightest bit too loose, it could hinder her ability to perform at her best level after all.

Dropping her unsure glance, a smug grin split her muzzle. Truthfully, she was nearly as prideful of the costume as she was her own ability. The outfit marked her as the Rainbow Dash, and as long as it remained, ponies everywhere would know that she was the best superheroine Equestria had ever seen - self declared of course. If something could ever represent her role as a hero, it was this outfit. Her smile wavered as her admiration was interrupted by an all too familiar feeling in her loins. Grimacing, her arousal finally surmounting her joy, she felt her marehood wink, grasping at the open air, desperate for some satisfaction.

Cmon Rainbow! Seriously…

Scorning her own biology for allowing her carnal needs to reach such levels, she quickly snatched up her costume and laid it out on her bed. If she were to quench this heat before it became unbearable, she had to handle whatever hero work she had fast. Unfurling the suit, she slowly slipped her forelegs into the outfit, feeling the tight fabric grip to her form. Next, she slipped her wings into the holes on the sides of the costume, a process that was harder than usual due to their slightly stiff status. The process was easy enough, but now came the frequently annoying part of her uniform - her hindlegs. Sighing to herself, she awkwardly stretched her semi-stiff wings back and grabbed the lower half of her costume. She slowly raised the suit up her hindlegs, with all moving smoothly until she reached her thighs, where the suit now had trouble slipping over.

Her thighs weren’t that large, but they were healthily built with a mixture of muscle and a subtle cushion of plumpness, which made them seemingly large enough to always make slipping on the backside of her suit a pain. Groaning in frustration, she pulled up on her outfit harder with her wings, attempting to pry them over her built yet plump rump. The material stretched slightly, but it still barely inched upwards from her efforts. Her annoyance building, with vital time being wasted, she grit her teeth, flexed her wings, and yanked the garment up fiercely. Finally surmounting the obstacle before it, the outfit flew over her thighs and slipped up her flank. The sudden surge upward was what Rainbow was hoping for, but there was an unforeseen consequence for her actions. Once it passed her thighs, the form fitting suit clung to her body and pressed sharply against her engorged pussy and sensitive teats.

The sudden sensation of the tight pressure, accompanying her already aroused state, caused her to elicit a throaty moan. The costume pressed against her marehood, quite literally grinding against it, noticeably dampening as her arousal pressed into the rear of her costume. Not only that, it also snuggly fit over her tits, with her sensitive, erect nipples pressing against their tight confines. Though she hadn’t expected it to stimulate her, the getup also pressed against her asshole, adding to the concoction of unplanned pleasure. Unbeknownst to her, the suit clearly outlined her perky tits, plump pussy, and throbbing asshole, making them all easily noticeable through the fabric gripping to her body.

“B-buck…are you k-kidding me?” she muttered to herself, breathing heavily as she recovered from her sudden outburst.

Her own suit, what encompassed her as a hero, had just made her moan aloud. Sure, it was tight, but it never before caused such an absurd reaction out of her. Squirming in place, she tried to find a way to quell the now pleasurable sensation in her nethers. No matter how she shifted, adjusted, or fidgeted, the suit continued to rub against her sensitive regions. It felt tighter than usual, and every motion she made only rubbed it against her in the least preferable way. Yielding her efforts, accepting that she couldn’t solve the issue at hoof, she stomped the ground.

Refusing to let her estrus get in the way of her work, her pride pushing through the lust, she focused on collecting herself. “I…I can deal - MMPH - I can deal with this. Nothing stops the Rainbow Dash!”

Sure assured herself the best she could, though the sensations her costume gave were driving her mad with lust. Her best bet was to tell herself she wasn’t getting egged on by her own outfit, and to focus on fending off whatever foe awaited her. Ideally it’d distract her from her situation, if not, she’d at least have an incentive to beat whoever or whatever the problem was at a quickened pace. She continued squirming in place, due to her body demanding the satisfaction she was denied earlier, and stifled a moan, as her suit slid between the slickened folds of her marehood.

Shaking her head, attempting to ignore the electrifying sensations coursing through her, she made a silent promise to herself to have her costume adjusted after today. Maybe it didn’t have to be this tight after all. Huffing hot air from her nostrils, she managed to fully adorn her outfit. Turning to her side, rummaging in the closet, she grabbed a pair of yellow visors and threw them on.

Awkwardly shuffling through her apartment, each step causing another slight surge of pleasure within her, she reached the monitor the city had installed into her home. Peering her eyes at the screen, grinding her teeth as her loins pulsed with need, her eyes couldn’t help but roll. The screen before her read, clear as day, “Flux Tempus spotted at the docks. Urgent Response needed.”

“Again, seriously? Cmonnnn…anypony could deal with a joke like him!” she groaned, pouting in annoyance.

The guy was a total waste of time. She had dealt with him at least a dozen times in her short time in the city, each encounter as simple and easy as the last. The guy was obsessed with dark magic spells, always screaming and hollering about how powerful and abnormal the incantations were, but he was always too slow to even land a hit on her. Each and every time she faced off against the unicorn, he’d come up with some over the top monologue, attempt to fight her, and get his flank kicked. Every. Single. Time.

She did have to admit, he actually did seem rather intimidating, at first glance at least. His expertise in the dark arts was decently impressive, not something to the level of Sombra, but impressive nonetheless. Still - she was a total counter to him. Her speed completely defied any and all of his strategies, and as long as she didn’t get distracted, he’d realistically never even land a blow on her.

Lingering on that thought, she stopped for a moment. What if he did land a blow on her? What was he capable of? What would he do? Would he hold her captive to try and get leverage maybe? Mock her and broadcast her defeat to the entire city? Would a single hit really be enough to take her out? Shaking her head, she chuckled lightly to herself. She’d never find out anyways, since she was just too fast for the guy - plus, if he ever did manage to beat her, which would again, never happen, she doubted he’d do anything that bad.

“Well,” she started glancing back at her flank as she spoke to herself, “at least it’ll be fast. Sooner I get this off the better.”

She trotted towards the front door of her apartment, quickly glancing outside her window. The light pitter patter of rain earlier had faded, now a strong downpour. Sighing in annoyance, she exited her apartment, made her way down the flight of stairs, each step causing her suit to rub against her, teasing her further. Finally reaching the complex’s lobby, obnoxiously aroused while doing so, she made her way out the front entrance to the streets outside. Nopony was in the lobby, nor was anypony outside, seemingly all avoiding the storm, not that she could blame them.

Stepping out from the awning in front of the building, she felt the rain soak her entire body in mere seconds. Grimacing as she felt her costume dampen, its now wet state sure to slow her down. Even worse, it was now pressing against her body with a bit of additional weight. Biting her lower lip, she looked back at herself, eyes widening as she noticed a very apparent issue. The fabric her attire was made of was rather thin, again to focus on speed, and due to that, getting it wet led it to become partially see-through.

She surveyed her body, noting that her cutie mark was partially visible through the lining of the suit, and gulped. Her telltale cloud and rainbow lightning were clear as day on her flanks, even through the fabric. Nervously grinding her teeth, she craned her head down and peered at her belly. Tracking herself further down, a blush formed on her muzzle as she confirmed what she was fearing.

Her tits were now very apparent through her suit, the perky bosoms standing out like a sore hoof within her outfit. The fabric outlined them exceptionally well, somehow making them seem even more sexualized than if she were in the buff. Her eyes went wide as she came to a stark realization. Realistically, if her tits were this apparent through her suit, then her engorged marehood and asshole were likely just as bad. The suit was tight all over her, meaning there wasn’t a chance in Tartarus that her nethers weren’t in the same state as her bust.

Grinding her teeth, her frustrations rising, she quickly took to the sky. She had to get this done fast. Her current state was humiliating enough, and she worried she may get even worse. Unfortunately, flying fared her body no better than walking. With each perpetual flap of her wings, her apparel stretched and pulled with them; constantly stimulating her body. Shivering in delight, finding it genuinely difficult to fly, she furrowed her brow and carried on. Doing her best to just focus on her destination, she mulled over her unfortunate situation.

Okay, I really gotta get this done fast. This is bad.

Author's Note

Feels weird actually publishing the first chapter of this big fic! Hopefully y'all enjoyed it so far, cause there's a lot more coming!