> Sweet Siblings
>  by PegPony
> --------------------------------------------------------------------------

> Prologue
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Rarity and Rainbow were relaxing on the couch together, long ago Rainbow had asked Rarity to be her "pretend girlfriend" but quite a while afterwards they had acknowledged that the "pretend" part had vanished and they were now legitimately dating each other properly.

Whilst they were relaxing, their daughters, Rainshine and Glittergloss, walked in to ask their mothers an important and interesting question.

Rainshine, addressing Rainbow, said "Mom, know how I'm your daughter and half-sister but aunt Twilight helped me get you pregnant with a baby that'd be my half-sibling and child but also your grand-child?"

Rainbow went "Uh... yeah?"

Glittergloss, addressing Rarity, continued "We were just wondering if maybe you'd let Rainshine and I get each other pregnant as well!"

Rarity shrugged and said "Why not? I'll call Twilight tomorrow OK?" Rainshine and Glittergloss high-fived each other and left the room.

Rainbow chuckled "Sibling lust! That reminds me, how did you and Sweetie Belle end up having sex with each other? Care to tell me?"
> Sexy Sisters
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Rarity was only twelve years old when she started to question her own sexuality, her thirteenth birthday was only a couple of weeks away and she was already getting flustered about what she should wear for her birthday party but now she had a sexual identity crisis to go with it?! Rarity was dramatic at the best of times but overthinking about fashion whilst simultaneously trying to figure out what team she was batting for was not a good mix, she mainly tried to remain calm for one tiny reason.

Sweetie Belle. Sweetie Belle idolized her big sister and while Rarity found it a bit of an ego boost that her little sister admired her so much, she also felt the weight of responsibility that any role model goes through in making sure that she demonstrated acceptable traits just in case Sweetie Belle decided to try and emulate them in some way, Rarity didn't exactly want to convey the idea that the best way to deal with depression was to lie in bed crying and eating tubs of ice cream all day. Rarity wanted an outfit that embodied the sense of transition, both because she was going from child to teenager and also because the more she thought about it, the more certain it became that the gender she initially thought she was attracted to was about to change.

Rarity eventually found the perfect outfit, a knee-length and sleeveless dress that started off purple at the top but got progressively lighter in shade the further down the dress it went until becoming a nice blue. Sweetie Belle had been watching with mild interest as Rarity had been digging around in her wardrobe, she liked spending time with her sister even if it was just seeing her look through different clothing options. When it came to the day of the party, Rarity had an absolute blast, she didn't exactly approve of Sweetie Belle's choice to wear a yellow shirt and some blue dungarees but she kept quiet so that she could have fun. Rarity's friends, thankfully, had all dressed much more appropriately and Pinkie Pie had promised not to interfere with the party plans because she knew Rarity wanted to hold a party that felt "high class"

It was upon reflection during the party after seeing all of her female friends that she affirmed something in her mind, she was definitely gay. She didn't feel a sense of attraction to her friends, not romantically anyway, though she recognized that when thinking about boys she felt rather uninterested but when it came to the girls... it made her shudder. Rarity decided that she didn't want to come out of the closet quite yet, the revelation that she was gay was still new to her and she felt it was too soon to tell anyone until she felt sure, even though she had found herself ogling her own mother after the party... it was odd but she wasn't yet ready to find out if she had an incest kink as well, figuring out that she was gay had been enough for one day, especially during a big party.

It was when Rarity was fourteen, after an entire year of feeling lust towards the fairer sex and pretty much nothing for the opposite gender, that she felt pretty certain that her assessment was correct, she is gay. She came out to her friends first and foremost and while they found it surprising, they accepted it and Pinkie had begged Rarity to let her throw a "coming out" party at some point. Rarity agreed on the condition that she'd at least wait until she got around to telling her parents about her sexuality, a party wasn't the best way to tell them.

It took Rarity another year to work up the courage to tell her parents, once she was fifteen her parents finally knew and Pinkie finally got the throw her party. Rarity's parents were exceedingly OK with it to a point where it seemed like they almost didn't care, Rarity knew that they understood it was a tricky thing for her to handle so maybe they were trying to soften the blow by acting casual and kind of "meh" about it. Now that the issue of her being gay had been dealt with, there was another teensy weensy little facet of her sexuality that she had sort of just ignored for the most part because she was so focused on the needless worry that came with outing herself to everyone she knew, she had to figure out if she did in fact actually have a fetish for incest.

She had always been aware that her mother was a good-looking woman from a young age, plenty of guys still couldn't keep their eyes off of her even after getting married and having children, she was mature but her body didn't look as if it had aged a decade and she was very lucky to still look so desirable despite being a woman of advancing years. Acknowledging that someone was nice to look at was one thing but feeling actual physical attraction? That was a different ball game and Rarity had spent a couple of years ogling her own mother while thinking "I wonder what it'd be like to get between those legs and lick her silly?"

A week after the coming out party, Rarity got on her lap top to see what the so-called "etiquette" was of incest in Equestria, she knew it was legal because plenty of people had unashamedly bragged how fast they could make their cousins cum without even touching their genitals, though Rarity felt like there had to be more to it than it simply being "Fuck anyone you like but look out for age, consent and all that stuff!"

Rarity did find that incest was surprisingly common, there whole porn categories and even websites dedicated to people who preferred to keep things in the family... though there did seem to be a general consensus. Incest was perfectly fine, very popular and really sexy... if you were strictly talking about fucking a sibling or a cousin, that was the norm.
Rarity was disappointed, seems like her mom's cunt was off limits if she wanted to enjoy incest that didn't deviate from what others did regularly. At least all of that browsing on the internet had confirmed that she was indeed very into incest, her panties had gotten exceedingly damp to a point where she had to take them off, throw them in the washing basket and then crank one out to a video of Flitter and Cloudchaser going at it.

An hour later once Rarity had calmed down, cleaned herself up and had decided to catch up on some homework she had to hand in at school tomorrow, Sweetie Belle politely knocked on the door and timidly asked "Rarity? Can I come in for a bit? I need to talk to you about something"

Without even flinching, Rarity just replied "By all means dear, come in"

Sweetie Belle walked in, fidgeting and clearly nervous about something yet still managing to speak above a whisper, she swallowed the lump in her throat and said "Sis... you're... you're um... gay, right? Into girls?"

Rarity nodded "Yes, well remembered, though I get the feeling that's not exactly your concern... unless you think being gay is wrong of course"

Sweetie panicked and shook her head "No no no! I think it's awesome! It's just... well, how old were you when you like... knew you were gay?"

Rarity pondered for a moment, this was an interesting line of questioning but saw no harm in answering it, Rarity simply answered "Hmmm... I was twelve or thirteen, I was pretty much your age actually!" It was as Rarity stated that fact that it clicked in her mind, was her little sister beginning to question her sexual preferences as well? Interesting.

Sweetie continued "Right... and when you... when you figured out you were definitely gay did you ever like... find out anything else? Like... say you had a crush on someone who... who... who is not someone you expected to have a crush on or maybe you did because... but... ah whatever! What I'm trying to say is did you also figure out something weird about yourself or something? When you knew for certain that you were definitely into girls did you find out something strange as well?"

Rarity, of course, did find out out that she had a particular interest in her mother but surely Sweetie Belle wasn't going through the exact same thing was she? Rarity didn't know how she should answer this, remembering what a delicate subject it was she didn't want to push the poor girl on the issue but at the same time she felt obligated as a big sister to provide some insightful advice on the situation in order to help. Rarity went "Well... if you have a crush on someone dear, then depending on who it is, you need to tell them how you feel directly, what happens after that is up to the hands of fate I'm afraid"

Sweetie sighed "I can't just confess to yo... to he... to the person because... I'm not sure about... something just yet... I need time"

Rarity said "Well then time is the only option you've got for the moment, sorry I can't be more helpful. You should be getting ready for bed now"

Sweetie walked off ready to get some sleep and prepare for the school day ahead of her tomorrow... Rarity smirked, Sweetie hadn't been nearly subtle enough. The start of the words "you" and "her" in Sweetie's last statement were so clear that she might as well have said them out loud! Sweetie was considering the possibility that she might also be gay and rather than lusting after her mother, was lusting after her sister, Rarity! Rarity was ecstatic, if it turned out that Sweetie was gay and became brave enough to confess her feelings, then as soon as she turned eighteen Rarity could just pounce on her like a sex-starved tiger! However, Rarity decided to be patient for the moment, no sense in planning a steamy lesbian romp with her sister before the poor girl had actually had time to slow down and find out if she was really gay or not.

Rarity got the confirmation she needed a couple of years later, much like her big sister, Sweetie Belle had waited until she was fifteen to declare to her parents that she was also not at all interested in boys. This was more surprising for Cookie and Hondo and it showed, they didn't have a problem with Sweetie being gay at all, the thing that they found surprising was that BOTH of their daughters had come out as gay and they had to wonder what exactly was occurring in the womb for one hundred percent of their children not liking the opposite gender.

Rarity still hoped beyond hope that her little sister had an incest kink and that, more importantly, she still held onto the crush she'd hinted at years ago when approaching Rarity about her possible homosexuality. Rarity still had some waiting to do, she wanted Sweetie both because she had developed rather nicely and because she wanted to indulge in some incest, the only thing in the way of things was Sweetie Belle's age. Three more years, once Sweetie hit eighteen she'd be ripe for the taking.

The day eventually came when Sweetie's birthday rolled around and she reached one of the most important milestones of her young life, she was finally old enough to go clubbing and lick as many cunts as she wanted, something that Rarity had been enjoying for a couple of years already. Rarity had intended to make the first move, probably a week or two after the birthday celebration... so imagine her surprise when it was the birthday girl herself who actually decided to come on to her big sister.

Rarity was in her room and lying on her bed in an attempt to recover from a party that had been nothing but junk food, loud music, dancing, karaoke, constant selfies, inappropriate party games and the squeals of excited and annoying teenage girls hanging out with all of their gal pals. The guests had gone home and the two of them were left to deal with the aftermath... but Sweetie still wanted one last birthday activity. Sweetie walked in and said "Um... h-hey Rarity... you feeling alright?"

Rarity looked up and smiled before going "Oh I'm quite alright darling, I admit that of all the wild parties I've been to that was one of the wilder ones but I'm not a stranger to the occasional wild night. I hope you didn't come here just to check on me because I assure you that I am fine and you shouldn't worry about your big sister because so long as you had a good time and a really fun birthday then I am extremely happy!"

Sweetie Belle blushed and went "Really? Well... th-thanks Rarity but... there's... there's actually... something else that I... that I really w-want..."

Rarity, intrigued, raised an eyebrow and asked "Well what is it Sweetie? It's your birthday and I dare say my little sister deserves to be spoiled!"

Sweetie sauntered over and quickly leaped on to the bed before getting on top of Rarity, straddling her waist. Rarity looked up at Sweetie in confusion until Sweetie just went "I don't care what happens but I just need to do this! Please don't freak out on me sis! I can't help myself!"

Sweetie leaned down and planted a big sensual kiss on Rarity's lips. Rarity wasn't sure how to react, not only had she intended to start seducing Sweetie way after her birthday was over but she was also going to be subtle with it, some light flirtation there or an "accidental" grope here, Sweetie had decided to just go for it on the very night of her birthday and show her affection in a very blatant and direct way to boot! Sweetie eventually broke the kiss and backed away slightly, breathing heavily as she recovered from finally caving in to her desires and at that very moment, she was terrified of what her big sister would do or say.

Rarity gathered her thoughts, this wasn't exactly planned but then again, where was the fun of some casual sex if wasn't spontaneous? Rarity smirked and responded "Well... I do hope you're not stopping!" The excitement that twinkled in Sweetie Belle's eyes was astounding as she grinned, overjoyed that Rarity felt the same way as she immediately resumed the kiss, pouring all of her passion into it with Rarity actually reciprocating this time and kissing back. It was finally about to happen. The two women moaned into each others mouths as their tongues wrestled for dominance in their lustful make-out session, Sweetie Belle grabbed and massaged Rarity's large sensitive breasts, to which Rarity's only reaction was to clap her hands down on Sweetie's cute little butt and started gripping and slapping the soft cheeks for fun.

A minute of kissing led to Rarity rolling them both over until she was on top, eventually they both needed to catch their breath and as they separated Sweetie Belle demanded in a husky whisper "Lick me..."

Rarity said nothing as she simply started unbuttoning the front of Sweetie Belle's jeans, hastily pulling them down along with her panties, eagerly anticipating the moment where she'd finally enjoy some incest.
After haphazardly discarding Sweetie's jeans and panties by basically throwing them across the room, Sweetie parted her legs and Rarity lied down until she was looking directly at Sweetie's tight virgin pussy, she salivated at the sight of such succulent looking lips while Sweetie just felt embarrassed, horny, worried and desperate all at the same time. Despite the sexual energy crackling in the air, Rarity decided against just diving face first into her sister's muff and started off by applying small tender kisses to her thighs, gradually getting closer and closer to the Sweetie's rapidly moistening young cunt, her needy folds pulsing and quivering with want. Sweetie Belle was whimpering and restraining herself a lot as she fought the urge to yell at Rarity to just get on with it.

Her patience paid off however, Rarity's lips grazed against Sweetie's labia on her final two kisses and that was when she finally moved onto  closing her mouth around Sweetie's sloppy fuck hole and licking with wild abandon, relishing the sweet taste of her addictive female juices. Sweetie gasped in elation, her hands flying to grasp onto Rarity's head, Rarity definitely wasn't promiscuous but the skill she showcased with her tongue demonstrated that she'd eaten out a girl or two in her time. Rarity wrapped her arms around Sweetie's legs to keep them parted, experience had taught her that girls who were having their cunts licked tended to have muscle spasms that forced them to close their legs in an effort to cope, which resulted in her head getting crushed and not being able to put her tongue to work as good, not really ideal for cunnilingus.

Sweetie's breathy moans only escalated as Rarity practically devoured her mound like it was the last pussy she'd ever get to taste, though they both knew that this was an activity they'd definitely be repeating in future, there's no way they'd be able to deny the urge to do it again. Rarity was hesitant with her next move but figured that if she really wanted to give her little sister the orgasm of a lifetime, then she'd pretty much have to pull out all the stops and use every trick in the book, Rarity had developed somewhat of a technique when she wanted to make a girl cum and her method hadn't failed her yet, phase two. 

Sweetie moaned anew, intertwining her fingers with Rarity's luscious purple locks as she gasped "Oohh holy shit Rarity! That feels so... yes!" Rarity had gently pushed her tongue into Sweetie's cunt and was now making very hard deliberate licks up and down, sliding up and down the slick walls of her tight teenage love tunnel. It was quite a different pace compared to the way she basically slobbered all over the outer lips, now it was more measured and skillful as if she were caressing her little sister's hole rather than thrashing around wildly like a sex mad lunatic. Sweetie was showing a surprising amount of endurance for a girl who was experiencing the pleasure of another girl going down on her for the first time, she had masturbated a couple of times sure but cranking one out could never ever even hope to replace the real thing in any capacity.

It was when Rarity found the g-spot and paid special attention to it with her tongue that Sweetie's orgasm really started to build faster than a runaway train, her body practically shaking as she panted heavily and tried to hold back what would have been extremely whorish groans. Rarity could feel the familiar vibrations that came with a girl who was well on her way to cumming and so she kept up her relentless oral assault on Sweetie's g-spot, biding her time and waiting patiently for the moment that would allow her to employ one last tac-tic to guarantee an explosive orgasm for her little sister, she had to be generous after all!

Sweetie was beginning to sweat, her hair slightly frazzled, toes curling, Rarity saw the telltale signs that her dear innocent and sweet little sister was maybe only thirty seconds away from absolutely creaming herself. With startling precision, Rarity moved her tongue to Sweetie's clitoris and started flicking her tongue back and forth, directly stimulating the most sensitive part of her sister's body just moments before her climax. Sweetie was sent crashing into her orgasm sooner than she expected and couldn't help but let out a shrill scream "Ooohhh shit RARITY!!!!!!"

Sweetie's gushing cunt immediately flooded her sister's mouth with her female fuck fluids, practically forcing her to gulp down every last drop. The way Sweetie bucked and writhed in pure elation caused Rarity to constantly have a barely legal, aching, sore, over-worked and borderline over-stimulated cunny being repeatedly mashed against her jaw, still squirting and completely soaking the lower half of her face in cum. Rarity allowed Sweetie to ride out what was clearly a powerful orgasm and help her relax by going back to her original pace of slow and sensual licks up and down her puffed up and pulsating pussy lips.

Sweetie panted as she came down from her mind-blowingly incredible finish, her body still experiencing the aftershocks of the experience. Sweetie lay in exhaustion only just barely registering her sister still tenderly licking away at her folds, shuddering and shaking like a leaf. Once the last tremors of her orgasm had faded away, Sweetie found the energy to place a hand against Rarity's forehead, signalling that she'd had more than enough licking for one day, Rarity moved away and licked her lips before wiping away the excess fluids from her mouth before asking "So... I can guess from all the squealing and rather large quantity of juices you made me drink... that you rather enjoyed that?"

Sweetie nodded and went "Uh-huh... that was... fucking awesome..." then sat up as she continued "It was the best but...... you didn't cum... I know it's my birthday but I think you deserve to get some release!"

Before Rarity was able to assure Sweetie that licking her out had been fun enough and that she wasn't obligated to return the favor, Sweetie scampered off to retrieve something. Rarity just rolled her eyes with a smile of admiration, looks like she couldn't stop her sister from insisting that she do something for her even on her birthday, such a kind girl. Turned out Sweetie was a slightly kinky girl as well, when she returned to the bed room she was donning a rather impressive black strap-on. Rarity was taken aback slightly, she wasn't even aware that her dear Sweetie Belle actually owned a strap-on in the first place, she held in her excitement for a moment and did the responsible thing of going "Goodness Sweetie Belle... where in the world did you get that from? More importantly... I do hope you haven't used that thing before today!"

Sweetie Belle blushed and said "I... n-no! Of course not! I didn't have underage... besides, I only got it today, it was a joke present from Scootaloo and I figured that this was the perfect time to use it!"

With those two worries put to rest, Rarity smiled and got into the same position that Sweetie Belle had been in moments ago, on her back with her legs open, her pussy wet and ready to be taken as she simply went "Well, in that case darling... why don't you get over here and fuck me?" Sweetie couldn't move fast enough as she practically leapt onto the bed, immediately getting in between her big sister's thighs, eager to slide inside and start hammering away like her very life depended on it, to pound Rarity's pussy until she ran out of energy... for that night anyway. However, with Sweetie's haste came clumsiness as well, she felt confident that she knew where Rarity's entrance was but found that it wasn't as easy as it seemed, in her rush to start fucking Rarity she started moving forward without even looking let alone aiming herself.

Sweetie only stopped moving when Rarity gasped in surprise and said "Sweetie Belle darling, unless your intent was to... um... go down the path less traveled, you may want to set your sights a little bit higher!" Sweetie was puzzled for a second until she looked down only to see that the head of her strap-on was pressed against her big sister's pucker. Sweetie smiled apologetically and moved back a little, making sure that this time she had the right hole and stayed on target... for the most part. Despite her attempts, Sweetie failed to line herself up properly and every time she tried to push in, the strap-on ended up slipping away instead of actually gaining access to Rarity's waiting and moist cunt. Rarity tried to be understanding because she knew Sweetie wouldn't be able to properly wield a strap-on perfectly yet, even she herself had yet to master the delicate art, though she found herself getting impatient.

Eventually, Rarity reached down and used two fingers to spread her pussy lips, then clutched her other hand onto the strap-on and gently guided the head so that it was basically impossible for it to go anywhere except inside her unless Sweetie Belle decided to move backwards. Obviously, Sweetie made no backwards movement whatsoever and in a matter of seconds the tip was in, Rarity moved her hands away when she was certain that Sweetie Belle could do the rest and just rail her. Sweetie slowly sank several inches of the strap-on into Rarity's quivering love tunnel until finally bottoming out, she leaned forward, squishing her soft breasts up against her big sister's and whispering "Rarity... I just wanna say that... in a sister kind of way I... I love you..."

Rarity smiled and replied "I love you too Sweetie... happy birthday..." 

The two came together in a passionate kiss, Sweetie had originally intended to make measured and sensual thrusts so that Rarity could enjoy the anticipation and have her build up and approach her orgasm comfortably in a way that would feel almost completely relaxing for her. Sweetie hadn't factored in the sheer lust they'd each be sharing in that moment and it became clear that she had abandoned her original plan when she started ramming Rarity, drilling her cunt like she was trying to wreck that pussy and rock her sister's world as hard and fast as she could, pumping like a mechanical piston in the fashionista's fuck hole.

The response from Rarity was immediate, she hadn't expected her little sister to ravish her so savagely, her shrieks were muffled by the kiss but Sweetie knew Rarity must have been having the time of her life judging by the fact that Rarity had wrapped her legs around her waist and was gripping onto Sweetie's back as their fat tits rubbed against each other. Rarity didn't know if she'd be able to last quite as long as she'd hoped, this was only her second time being on the receiving end of a strap-on and the first girl who had fucked her wasn't nearly half as rigorous as Sweetie Belle was being, so her lack of experience coupled with the fact that she'd been hit with a barrage of pleasurable sensations from Sweetie's rough treatment, meant her climax was fast approaching.

Sweetie wasn't sure how she had the energy but never once did she slow down or deliver a thrust that didn't bury the strap-on in Rarity's cunt right down to the base, hilting every time and slamming it inside as hard as she was able. She was glad that her first time using a strap-on was going so well, the only humping motions she had ever done before was on pillows, not exactly perfect practice for plundering a hot pussy. Eventually they had to break the kiss, had they the ability they might have engaged in some dirty talk but they were both breathing far too heavily for that, they were sweaty, their hair was messy and all they could focus on was the sex. This would be a birthday to remember.

Rarity desperately wanted to hold back, considering it embarrassing that she would cum so quickly, it took Sweetie at least eight minutes to cum from Rarity's expert cunnilingus and yet here Rarity was ready to cum and Sweetie had only been fucking her for a mere three minutes! Try as she might however, there was no way of stopping the inevitable and so Rarity succumbed to the will of her own body, biting her lip and groaning in a vain attempt to silence her own slutty moans of pleasure as she was hit by one of the hardest orgasms she had experienced. Sweetie was somewhat forced to stop thrusting as her sister's legs tightened around her waist and held her inside the spasming walls of her love tunnel as it rippled around Sweetie's wonderful latex length.

Once Rarity's climax reached its end, she did something unexpected and rolled them both over so that she was on top. Sweetie hadn't expected that her big sister would be ready for another round where she'd have to deal with Rarity riding her strap-on in cowgirl position. What Sweetie soon realized was that Rarity was actually not ready for a round two and was in fact just bringing herself into a relaxing afterglow, she slowly eased herself up and down on the strap-on a couple of times before gasping when Sweetie gripped onto her waist and gave one powerful thrust up into her cunny, after that Rarity rested her full weight down on her younger sibling and rolled her hips around in circles for a few seconds before getting off and collapsing onto the bed.

Sweetie's strap-on was so slick from being inside Rarity that there was a slight shine to it, the same kind of shine that they both had on their skin from sweating so much in the midst of fucking each other so hard. Rarity turned to face her sister and said in a most gentle whisper "Sweetie Belle... I'm going to go out tomorrow... buy some lubricant..." as she reached behind Sweetie to grab one of her buttocks and saying "Then I'd like to borrow your strap-on so I can destroy this ass of yours"
> Epilogue
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Rainbow Dash chuckled "Wow, your first time with Sweetie Belle was really that kinky? Did she enjoy taking it in the ass the following day?"

Rarity went "Unfortunately she didn't get to experience anal on that particular day, I was rather busy and thus too preoccupied to do her"

Rainbow Dash, bemused, asked "With what?"

Rarity smirked "Making outfits to help you get your dad to fuck you"

Rainbow simply replied "Ah... my bad. Why do you think Rainshine and Glittergloss wanna fuck? They're not related, not by blood anyway"

Rarity shrugged "Meh, who knows? Do you think we should have another child? Twilight will be coming round so she could certainly work her magic on either you or me, we can each other get pregnant!"

Rainbow giggled "You hate dick even though you humped your dad and I think two daughters are enough, besides... I might love sucking my dad's dick but your pussy tastes infinitely better"

The two of them smile and shared a loving kiss.

The End