As Rainbow walked into the throne room she saw Twilight wearing goggles and a lab coat, messing with various brightly colored liquids in beakers and a few other pieces of scientific apparatus that she didn't recognize. Twilight noticed Rainbow walk in and said "Rainbow! Good to see you! Forgive me if I seem a little distracted but I'm trying to measure out all these different ingredients to see what kind of potions I can create, I have certain hypotheses for some of the things I've already created but have yet to actually ascertain whether or not I'm correct or detail the effects of any of them"
Rainbow shook her head and went "whoa whoa whoa, can you say that again but... y'know, less like an egg head?"
Twilight rolled her eyes and said "I'm mixing stuff together and I think I know what they do but I can't be sure"
Rainbow went "Oh! Well why didn't you say so? What you made so far?" Twilight, too busy carefully measuring out two potions, simply pointed to a beaker that was filled with a purple liquid. Rainbow looked at the strange brew, just staring at what appeared to be nothing too special, that is until she saw the label that read F.A.S.T, a speed potion! Well, Rainbow assumed it was a speed potion, why else would it be called "FAST"? Throwing caution to the wind, Rainbow picked up the beaker a gulped down the entire contents.
It was only as Rainbow was swallowing the last few drops that Twilight saw what she was doing and immediately gasped and shrieked "Rainbow! What are you doing?! You can't just drink some random untested substance! I'm not even sure what it does!"
Rainbow chuckled and said "What do you mean? You called it "FAST" so it's obviously gonna be some kind of speed potion right? Anyway, can't exactly un-drink so I'm gonna go ahead and test out if that stuff does what it says on the label!" Before Twilight could protest, Rainbow zoomed out of the castle.
Twilight sighed and said "Maybe I should have labeled the "Fertilization And Seduction Toxin" more carefully, though it looks like all I can do now is wait for the effects and, after some data collection, develop some kind of antidote if necessary", meanwhile, Rainbow was zipping around everywhere as fast as she could, waiting for her speed to magically increase. After spending several minutes flying around Ponyville and Cloudsdale aimlessly she gave up and decided she'd try again tomorrow, returning home for a nice long nap.
The next day Rainbow woke with a large yawn, feeling a little groggy upon having a slightly uncomfortable sleep that night. She opened up her eyes and looked down to see her erection tenting her duvet, she rolled her eyes and said "Ugh.... fucking morning wood...", it wasn't until Rainbow got out of bed and felt her stallionhood bobbing up and down as she made her way to go and make breakfast that something very suddenly occurred to her... she was a mare and as such, previously had not possessed what most stallions had, namely a long thick cock and a set of fat heavy balls. Her eyes went wide and she quickly galloped over to a mirror to confirm it, somehow over the course of the night she had lost her marehood and had gained the throbbing tool that was currently pulsing with need in between her hind legs, rather than being horrified and immediately flying over to Twilight's castle, Rainbow smirked at her reflection with an eyebrow raised as she saw just how oddly impressive it was.
Rainbow said to herself "Well, look at this thing... looks like my ego isn't the only thing I can stroke now! Imagine all the guys and girls I could fuck with this thing... but who should I try it out on? Maybe some young tight mare ass, or I could get some random femstallion to suck it...", Rainbow was so proud of her new addition that she forgot to even question how she had obtained it or if it would ever go away and return her original genitalia, the only thing she was now thinking about was how she was going to use it. It was as she was admiring her dick that there came a knock on the door, Rainbow adopted a mischievous grin as she decided that whoever this turned out to be was about to become the first one to experience her newly acquired dong, be it pony, gryphon or dragon, she'd soon be sinking herself into a moist warm hole and blowing a hot sticky load. Rainbow attempted to fly over to the door only to find herself losing balance in the air and tumbling to the floor, she shook it off and made a note that she'd have to alter the way she flew to take the extra mass of her stallion parts into account.
Rainbow trotted over to the door and opened it, eager to see the lucky someone was that would get to experience the effects of Rainbow's new sexual urges, though it she started to have second thoughts about when she saw that behind the door was her adopted sister, Scootaloo. Having sex with Scootaloo was a bizarre concept, there wouldn't have been anything necessarily wrong with it because they weren't related by blood and ever since getting her cutie mark she was, in the eyes of the law, legal, however the dynamic they had would make things awkward if they decided to be a little more than big sister and little sister... though Rainbow did have to admit that Scootaloo was a little bit sexy and that she wouldn't really have any qualms about doing her if she was up for it. Scootaloo wore a massive grin as she said "Hey Rainbow! Sorry if I woke you up, it's just that I...", Scootaloo froze as her eyes fixed upon the what was obviously a massive boner in between Rainbow's legs.
Rainbow chuckled and said "Don't worry kid, I just got up so you didn't wake me, though you did catch with a serious case of morning wood. From the look on your face I can tell you've already noticed it huh?"
Scootaloo just nodded, never tearing her gaze away from Rainbow's cock, a few seconds passed before she said "Rainbow... I... I uh... can you... use that thing? Because if you can I... I... I wanna..."
Rainbow was surprised, she knew what Scootaloo was about to ask but figured she might as well confirm it first as she went "You... wanna get fucked?" Scootaloo nodded, Rainbow looked around before ushering Scootaloo in and shutting the door, having sex with Scootaloo was perfectly legal but that didn't mean it wasn't frowned upon whenever an older pony perved on some pony so young. Scootaloo followed close behind Rainbow Dash, drooling in hunger at getting a good look at the round heavy nut sacks hanging down beneath her cock, Rainbow turned around and sat down on the bottom of her staircase, she didn't know what the potion she had drunk was doing but whatever it was, she liked it. Rainbow said "OK kid, I know that I'm nice and hard already but any mare will tell you that you gotta engage in a little foreplay before you get to the real fun, so how about you suck me off?"
Scootaloo remained silent as she closed her eyes and, without question, wrapped her delicate lips around one of Rainbow's hefty cum-filled balls and gently sucked, making sure to coat the sensitive skin in saliva as she dragged her tongue across it. Rainbow grunted and went "Mmm... nice start, it pays to give a little attention to the churning cum factories that work so hard to produce the jizz your body craves, it's practically polite to show them your appreciation... fuck...", Rainbow tried to place an event where she had experienced this kind of stimulation but for the life of her couldn't think of anything to compare it to, however when Scootaloo released her testicle from her mouth and began to rise, dragging her tongue up from the bottom of Rainbow's shaft right up to the tip of her throbbing member, Rainbow immediately recognized that her dick felt the same kind of sensations that her clit did.
Scootaloo opened up her mouth as wide as she could before enveloping the head of Rainbow's cock into her mouth and sucking with gusto, she made eye contact with Rainbow and batted her eyes like she was the most innocent creature in the world despite the fact she was swirling her tongue around a stiff veiny prick. Rainbow sighed as she placed a hoof on the back of Scootaloo's head and went "Ah yeah... that's the stuff, go deeper kid, impress me...", Scootaloo was already in love with Rainbow Dash and was now being given the chance to impress her, she was never going to turn down that kind of opportunity! Scootaloo closed her eyes as she began to descend, she didn't have much experience when it came to sex but she was at an age where she was beginning to learn what colts liked without having to get physical about it, it seemed colts were easy to please from what she'd heard. Scootaloo continued sliding more and more of Rainbow's fuck stick into her mouth right up until she felt her lips touch the famous medial ring that marked the halfway point on every stallion dick, it was at that point that she also felt she had crammed as much cock into her face as she could before it became uncomfortable and started to make her gag.
Rainbow groaned and said "Holy shit... how many dicks you been sucking to be able to get that deep? Guess you're not really in the best situation to be saying anything, so get that cute little face moving and then maybe we can move onto something a bit more naughty OK?" Scootaloo responded in the only way she could at that moment and started bobbing her head up and down and a comfortable and methodical pace, making sure that Rainbow's cock was out in the open air for too long before being back in the warm and wet embrace of her maw, her tongue never stopped moving as she aimed to please the divine tool that had made her adore the pony attached to it even more than before, such a beast deserved to be worshiped and she was going to deliver as best as she could. What Scootaloo lacked in experience she had in natural skill, she blew Rainbow like she'd been doing it for years and the incredibly lewd slurping noises she made were pushing all the right buttons, if Rainbow wasn't ready before then she certainly was now and at this point she was happy to just let Scootaloo do her thing. Rainbow had to remind herself that there was a wet aching pussy waiting for her that would only become available when she put a stop to Scootaloo's sucking, if there was one hole she wanted to jam her meat pole into, it was Scootaloo's tight young cunt.
Rainbow let out a breath and gently pressed a hoof against Scootaloo's forehead, she got the message and pulled herself back until Rainbow's rod slipped out of her mouth, pulsing and painfully hard. Rainbow let out a breath and said "Whoo... damn, you got some real talent there... now, if you turn around and get bouncing then maybe I'll reward you by giving your petite little pussy my first ever load, sound good?" Scootaloo couldn't move fast enough, so thirsty was she to share the pleasures of the flesh with Rainbow that she hadn't said a single word since requesting that she have sex with her, she turned around displaying her round cute butt and, more importantly, the moist folds and winking clit of her marehood. Rainbow bit her lip in anticipation as Scootaloo shuffled around to get herself perfectly positioned, anxious to have her twitching cunny completely filled and eventually bathed in several ropes of warm virile spunk as they splattered against her insides. Scootaloo, with perfect aim, lowered herself down and smooshed her entrance against the tip of Rainbow's dong, though with how slippery each sex organ was it came as no surprise that the initial attempt sent Rainbow's erection sliding away from Scootaloo's hole and momentarily resting in the crack of her ass.
Scootaloo lifted herself up and tried again, this time with Rainbow using a hoof to hold her cock and keep it steady. After a few seconds of Scootaloo pressing her wet pussy down on Rainbow's fuck stick, the head eventually popped in, making the two of them gasp as they felt each other's bodies connecting in such a deliciously pleasurable act, both of them were looking forward to the real action and Scootaloo certainly wasn't going to delay it a second longer now that she could easily take Rainbow's stallionhood inside her. Scootaloo groaned slightly as she widened her stance and began pushing down, the lips of her sopping cunt parting eagerly to allow more and more of that monstrous cock to enter and become enveloped in the soft velvety walls of her love tunnel, Rainbow Dash herself was having to resist the urge to just pin Scootaloo down and absolutely rail her. Much like with her mouth, Scootaloo's body was only able to take Rainbow Dash down to the medial ring, after taking a moment to adjust to such a mammoth amount of Rainbow's turgid length being inside her, she lifted her hips up until just the head was left in shortly before plummeted back down.
Both of them moaned in unison, the quivering walls of Scootaloo's pussy gripped Rainbow tightly, hugging her cock from every angle, massaging and milking it hungrily. After that experimental motion, Scootaloo became more confident and began to repeat it until she fell into a consistent rhythm, riding Rainbow reverse cowgirl in the hopes that they would both experience the strongest orgasms they could possibly imagine. The squelching sound of Scootaloo continuously slamming herself down on Rainbow's dick was only rivaled by the two of them grunting aggressively, Scootaloo was sweating profusely and was slightly embarrassed when she saw the cock shaped bulge moving up and down her abdomen, Rainbow meanwhile was just relaxing and allowing the rippling flesh of Scootaloo's cunny to bring her closer and closer to her first male ejaculation. Partway through the sex, Rainbow decided that things had been a little too quiet and figured that if Scootaloo was too concentrated on enjoying cock to talk, then she might as well engage in a little one way conversation to see if she could get Scootaloo a little closer to finishing.
Rainbow licked her lips and said "Mmm... I gotta say that you really know how to work a dick, I've only had mine ever since waking up this morning and I can already tell that I'm deep in some real good pussy, what do you think squirt?" Rainbow didn't realize how apt a nickname "squirt" was until the only response Scootaloo gave to her question was to scream and ram herself down as far as she could and cream on Rainbow's turgid length, fluids gushing out like a heavy dam inside Scootaloo's cunt had just been burst open by the battering ram that was Rainbow's cock. That was where Rainbow's endurance ended, the sudden feeling of a tight young mare's fuck hole, clamping, clenching and squeezing her dick while practically soaking it in orgasmic juices proved too much and Rainbow hissed "Holy shit" as she held onto Scootaloo's hips with both hooves and kept her there, the head of her cock flaring before pumping a full thick load into a very fertile womb. Once Rainbow's orgasm petered off, the only sound in the room was the sound of panting as they each tried to recover from a very satisfying round of sex, once Scootaloo lifted herself off of Rainbow's floppy softening cock, Rainbow just went "Fuck... you really drained my balls... you got the body of a whore Scoots..."
Scootaloo finally spoke as she said "I love you Rainbow Dash... I hope you've fucking impregnated me, if there is anyone in Equestria I'd want to knock me up it's you..."
Rainbow chuckled and said "Well... that would be one way to make your friends jealous I guess..."
All of a sudden a light bulb lit up in Scootaloo's head, Rainbow Dash mentioning her friends had sparked an idea so brilliant that, if she pulled it off, would make every pony happy. Rainbow Dash was Rainbow Dash, enough was never enough for her so why would it be any different when it came to gaining a young mare to use as a fuck toy? She deserved more! Secondly, Scootaloo and her friends were the cutie mark crusaders, they did everything together and everything meant EVERYTHING, so if Scootaloo was gonna be banged by Rainbow Dash 24/7 then her friends would be too! It was the perfect plan, Rainbow would have multiple lovers, Scootaloo and her pals would get to enjoy getting repeatedly fucked and impregnated, thirdly......... Scootaloo thought for a moment, she was certain there was a third aspect but she couldn't remember what it was, she shrugged it off as she realized that giving Rainbow more holes to fill and enjoying countless rounds of sex with her friends was enough as it was. It was a very shallow goal, though what pony said that shallow goals didn't count? A plan is a plan!
The next day Scootaloo asked Applebloom and Sweetie Belle to join her when she visited Rainbow Dash, when questioned why she just said she wanted some company, Scootaloo didn't exactly want to admit to her friends that she was hoping to make them fall in love with Rainbow and get themselves fucked the same way she had. Their first stop however was at Twilight's castle, if Applebloom and Sweetie Belle were to visit Rainbow Dash then they'd need the ability to walk on clouds. When the three of them were at the doors of the castle they knocked and a moment later, Twilight herself opened the door and said "Oh, hello girls! How can I help you?"
Scootaloo said "Hey Twilight, can you cast the cloud walking spell on Applebloom and Sweetie Belle please?"
Twilight raised an eyebrow and said "Umm... may I ask why they need that ability at the moment?"
Scootaloo confidently said "They wanna visit Rainbow Dash!"
Twilight's mood shifted, this would actually be a perfect way to gather data on the toxin Rainbow Dash had consumed without having to needlessly interrupt all the other research she was doing on the various potions she was brewing, Twilight said "Well actually, I would be willing to do that on one condition. You see, Rainbow Dash ingested a potentially dangerous chemical brew recently, if I allow you two to visit her will you note down any changes or differences in her and promise to return to me so you can report your findings?"
Applebloom went "Uuhh... sure, I guess"
Sweetei Belle agreed and said "Yeah, I don't see why not"
With no hesitation whatsoever, Twilight cast the spell and even offered the use of her hot air balloon to get to Rainbow's house, she was eager to find out the effects of the F.A.S.T liquid. When the three of them got to Rainbow's front door Applebloom looked at Scootaloo and said "Right, now that we are here are you finally gonna tell us why it is so important that we see Rainbow Dash?"
Sweetie Belle once again sided with Applebloom and said "Yeah, I don't understand why you're so adamant that we come see her, what's the big deal?"
Scootaloo just smirked and said "Oh you'll see, trust me" shortly before knocking on Rainbow's front door and waiting with great anticipation.
Seconds later Rainbow opened the door, her big cock still swinging between her legs as she went "Oh hey Scootaloo, I see you brought your friends along this time!"
As soon as Applebloom and Sweetie Belle saw Rainbow's thick girthy stallionhood, they felt an overwhelming rush of emotion in their bodies and knew immediately that they had fallen in love and also in lust with Rainbow Dash, Sweetie Belle suddenly went "Oh... I know what the big deal is, it's that big cock isn't it? Those big balls too, those big balls that would create a big load to pump into the nearest hole... oh fuck I'm already so wet..."
Applebloom salivated as she said "No food I have ever come across in my entire life has made me as hungry as that dick is makin' me right now..."
Rainbow Dash chuckled and said "Wow, you girls don't hold back do you? Scootaloo at least had a little restraint when she saw this thing, though that's not to say that I'm complaining at all. How about you come on in for a quick fuck?" The three of them rushed in with Rainbow closing the door behind them, she decided to deal with the newbies first before tending to Scootaloo who had so kindly brought her two new young mares to defile. Rainbow's cock steadily started to become erect as she said "So girls, which one of you wants to go first?"
Sweetie Belle stood in the middle of the living room, turned away from Rainbow Dash and layed her front half down on the floor, sticking her butt out to show off her moist winking marehood and saying "Please take me first, pin me down and wreck this pussy, I need it!" That display alone was enough to bring Rainbow to full mast, the testosterone coursing through her veins urging her to quickly give Sweetie Belle the dominant fucking she was so desperately begging and pleading for, Rainbow hurried over to the small mare and mounted, eager to aim her throbbing stallionhood at Sweetie Belle's entrance and plunge herself into some perfect pony pussy. Rainbow shuffled around as she prodded at Sweetie's behind until the head of her cock found purchase, pressed against her quivering cunt lips and well positioned to penetrate the shuddering mare beneath her.
While this was happening, Applebloom had gotten on her back with her hind legs spread and said "Hey Scootaloo, mind getting me ready for when it's my turn?" Scootaloo gave a predatory grin and practically pounced on Applebloom shortly before diving straight and ravenously devouring her pussy, her technique was sloppy and messy as she wildly thrashed her tongue over every inch of delicious flesh she could find, it was just lucky that Applebloom's inexperience meant she could still enjoy it and not have any real context for whether Scootaloo was doing a good job or not.
Rainbow Dash groaned as she sank her length inside Sweetie Belle, who was biting her lip and whimpering as she tried to hold back her squeals of elation from having her walls so wonderfully stretched by Rainbow's stiff stallion prick. Once again, despite being young mares they were still rather small in stature, meaning Rainbow could only get in as far as her medial ring before she couldn't progress any further, as Rainbow bottomed out she let out a breath she didn't know she was holding and relaxed briefly as she went "Whew... so, how you feeling kid?"
Sweetie was already cross-eyed with her tongue hanging out as she simply nodded her head and went "Uh-huh..."
Rainbow chuckled and said "I'm gonna guess that means you feel good, mmmm I gotta say, I'm already enjoying this tight young pussy and I'm not even properly fucking you yet... let's change that shall we?" Rainbow didn't hold back as she began to furiously piston her hips as hard and as fast as she could, Sweetie was so unprepared to be roughly pounded that suddenly that she could no longer stop herself from crying out in ecstasy, Rainbow breathing heavily as she grunted aggressively, determined to ram Sweetie's cunt like she'd never get to fuck it again. Scootaloo was still basically slobbering all over Applebloom's twitching folds, Applebloom was panting rapidly with a big blush on her face as sweat rolled down her temple, Scootaloo was lost in her own determination to make sure Applebloom would be ready to ride on Rainbow's rod.
Rainbow kept pounding Sweetie Belle with all of her might, eyes scrunched up, gritted teeth and hot aching muscles as she relentlessly kept thrusting and refusing to slow down or be more gentle, if Sweetie wanted to be fucked then Rainbow would deliver the fucking she desired. Eventually, Rainbow's endurance reached its limit and she almost growled as she pushed her flaring dick as deep into Sweetie's marehood and pumped a full fat load into her fertile womb, Rainbow's cum flooding her insides triggered Sweetie's own orgasm and she squealed as her pussy gushed fluids and hungrily milked Rainbow's stallionhood to receive as much seed as possible. Rainbow panted as she yanked her still erect cock out of Sweetie's wrecked cunt, dismounted and immediately getting on her back as she went "Applebloom, get over here and get riding, I got one last load and it's all for you......"
Sweetie Belle just collapsed on the floor, still shuddering in the aftershocks of orgasm, Scootaloo removed herself from Applebloom's pussy and wiped her drenched muzzle with a hoof before saying "OK farm girl, you're up"
Applebloom got up and said "Whew, about darn time! I don't know how much more I could take of you eatin' my pussy like it was your favorite dessert or somethin'" before trotting her way over to Rainbow, her member still painfully stiff and waiting to once again be surrounded by the moist warmth of tight young pussy. Applebloom got herself in cowgirl position and maneuvered herself until the head of Rainbow's penis was basically already inside her, then hummed as she descended, sliding the cyan length into her surprisingly accommodating nethers.
Again she could only go as far as the medial ring but Rainbow was impressed how easily she took it, Rainbow went "Damn Applebloom, this isn't your first experience with cock is it?"
Applebloom blushed as she said "Well... actually when I... t-turned legal... Applejack took a strap-on to my pussy... then... then Big Mac gave it to me in the ass..."
Rainbow chuckled and said "Geez, only hole you haven't had fucked is your mouth huh? We can fix that later, for now though you're on me cowgirl style so you better get riding on my pony baloney!" Applebloom began bouncing up and down, of the three of them she was the least vocal, apart from breathing and squelching pussy she didn't make a sound... until she did a little dirty talk.
Rainbow's cock was tingling, though her whole body got goosebumps when she saw Applebloom look at her with a wickedly devious smile and a glint in he eye as she said "Yeah... you like this pussy Rainbow? You like how my moist insides caress your fat throbbin' dick? Mmmm I can't wait for you to fuckin' nut inside me, I want you to empty your swollen churnin' balls in me, hope your cum factories are fuckin' ready to unleash a torrent of jizz into this pussy... a cowgirl doesn't just ride for fun, she rides to get some work done and right now I'm workin' on gettin' you to blow a load into my achin' cunt! Come on bitch, I know you want it... if you can stick your dick into Sweetie Belle and pack her pussy then you can do the same with me... I want it, you gonna make me beg? Don't hold back, stop resistin' and cum already! Do it! Breed me you whore!" Had Rainbow not already cum so recently, she was convinced that she wouldn't have lasted even halfway through what Applebloom had said, on this occasion it wasn't until the last syllable that Applebloom uttered that Rainbow faltered and let the floodgates open, pumping thick heavy ropes of cum into Applebloom and groaning as she felt fully sated and satisfied.
When Applebloom got off, Rainbow calmed her breathing down and said "Where did you learn that kind of language?"
Applebloom just went "Duh, Applejack taught me. She knew Big Mac was gonna fuck my butt so she gave some hints and tips on how to make a guy cum"
Scootaloo was about to claim her turn when she saw that Rainbow's stallionhood had disappeared and her vagina was back where it had always been, Rainbow saw Scootaloo's frustration and then noticed the same thing. Rainbow said "Aw, sorry kid, looks like it's only good for three. I guess I could always take the potion again... you three girls wanna spend your lives continuously draining my balls?"
The three of them looked at each other, they had all fallen in love with Rainbow and the idea of spending the rest of their lives tending to her was tempting.........
