> Buck to the Future: Futa Future Twilight Fucks Twilight
>  by VitalSpark
> --------------------------------------------------------------------------

> I Kissed Myself and I Liked It, The Taste of My Cherry Chapstick
> --------------------------------------------------------------------------

Twilight Sparkle's horn glowed and another book floated out of the box. She read the title and author, and levitated it up to the correct shelf, slipping it into place. Normally she would have asked Spike to help her shelve this big box of books that Princess Celestia had sent over, but Big Mac had invited him to watch hoofball, and actually the shelving seemed to be going a lot more smoothly without him.

In fact, she was just thinking about how smoothly everything was going, when everything stopped going so smoothly. An enormous ball of blinding light appeared in the middle of the library floor, forcing Twilight to avert her eyes. This proved to be quite an interruption to her shelving.

The light began to fade and Twilight dared to look towards its source so as to determine its cause. There, in the centre of the room, stood a lavender alicorn, about the same height and build as Twilight Sparkle, similar mane and tail, though slightly frazzled, wearing an eye-patch, bandages and torn black body suit.

"Future Twilight!" Twilight gasped.

"I'm sorry to have caused an interruption to your shelving, just when everything was going smoothly," Future Twilight stated apologetically, "but this is a matter of utmost urgency."

Twilight nodded. "Of course. How can I be of assistance?"

Future Twilight looked her in the eye. "I'll say this plainly. I'm here because we need to fuck."

"We need to… we need to what now?!"

Future Twilight took a couple of steps towards Twilight. "Look, I'm only here for a short time. There's no time to explain."

Twilight's eyebrows rose in suspicion. But this was her speaking. She had no reason to distrust herself. "Okay, so let's assume I accept that explanation. Wouldn't it be a bit weird?"

Future Twilight shrugged and answered matter-of-factly. "You masturbate — how is this any different?"

Twilight blushed sheepishly. "Who says I—?"

"I'm you," Future Twilight interrupted, raising her eyebrows. "You really think you have any secrets from you?" She tutted and mumbled under her breath. "By Celestia, I was such a dumb-ass last week."

"I suppose not," Twilight sighed, her face returning to its usual colour. She paused for a moment. "But wait a minute — if we fucked, then I'd be thinking about fucking myself. If it was the same as masturbation, then I'd be thinking about Suns— umm… about something else."

Future Twilight coughed, but her cough sounded awfully like she was saying, "Shimmer".

Twilight's face turned even redder than before.

Future Twilight walked towards the past version of herself, licking her lips. Twilight unconsciously mimicked the action. Her future self leaned forward and kissed her on the lips. Their lips locked together in perfect symmetry, and Future Twilight's tongue explored a rather familiar mouth.

After a few moments, the two alicorns broke off from kissing. Twilight, a little out of breath, panted, "that was really good."

Future Twilight nodded, already knowing that from her memories of these events. She leaned in and they kissed again.

Twilight felt less hesitation this time and their tongues danced together in perfect co-ordination. Future Twilight lifted a front hoof and ran it through Twilight's long silky mane. As they broke off, Future Twilight sucked on Twilight's lower lip for a second before finally releasing her mouth. Twilight sighed happily.

"You liked that, didn't you?" Future Twilight asked rhetorically.

Twilight blushed and looked away.

Future Twilight put her hoof on Twilight's cheek and turned her back to face her, looking into her eyes. Twilight leaned in to kiss her and once again, their tongues found each other, swirling around one another as they kissed with passion.

Future Twilight broke off the kiss. Twilight leaned in for more, but her future self had pulled away. "Don't worry, Twilight," Future Twilight said with a smirk. "There will be more of that soon. But let's talk about your fantasies.  I know you've always fantasized about being fucked in the plot with an enormous stallionhood."

Twilight's jaw dropped. "What makes you—?" She cut herself off and blushed. "Oh, of course you know."

Future Twilight's horn began to glow, and so did the area between her hind legs. "Behold," she said with a grin.

Twilight bent over to take a look. Her future self was in the process of growing a long penis out of a tear in her costume between her legs. "What?! How did you—?"

Future Twilight smirked. "Futa spell. It's in the gender-bending section of the Star Swirl the Breasted wing of the Canterlot archives."

Twilight furrowed her eyebrows. "Star Swirl the—?"

"Breasted," Future Twilight sighed, circling around to stand behind Twilight. "Keep up!"

"I don't even…" Twilight muttered shaking her head, while Future Twilight climbed onto her.

Twilight felt a sudden pressure against her plot hole as Future Twilight pushed the head of her erect cock against it. She winced in discomfort as her anal ring opened up to admit her future counterpart's ample girth.

"Sheesh!" she screamed and sucked in breath through her teeth. "Couldn't you have used some kind of lubrication."

Future Twilight slowly guided her cock inside the alicorn. "Meh… you'll get used to it soon enough."

A series of grunts and squeals came from Twilight's mouth as her visitor fed her large cock into her. Inch by inch the shaft disappeared into Twilight's body, until Future Twilight's barrel was flush with her plot.

Future Twilight allowed Twilight the mercy of a few moments to get accustomed to the feeling of the somewhat oversized organ inside her. She stroked Twilight's mane and felt the younger mare's muscles begin to relax.

Once Future Twilight felt she'd given her past counterpart enough time to adjust, she slowly withdrew her magical appendage about half way, before carefully sliding it back in, finding it much easier this time. Twilight's gasp as it slid inside seemed to be less one of pain, and more a noise of… perhaps not pleasure yet, but excitement, or intrigue.

Future Twilight began to slowly build up a rhythm, thrusting her cock into Twilight's plot hole with gradually increasing speed and force.

Twilight's gasps of whatever-it-was started to become sighs of pleasure and she found it impossible to resist reaching a hoof underneath her barrel to stroke her own pussy. She slipped just the tip between her silky lips to find they were already moist with her excitement.

Twilight folded her other front leg under her body, resting her head against the floor, to tilt her rump up and better present it to her visitor.

Future Twilight held Twilight's flank with her front hooves, pulling Twilight's body towards her while she drove her cock into her past self's plot. She grunted slightly, closing her eyes to better concentrate on the task, enjoying the feeling of Twilight's tight rear entrance as it pressed and squeezed every vein and undulation on her shaft.

Twilight's pussy was dripping wet now, and the sound of her slick hoof rubbing the lips could have been heard from across the room, were there any pony there to hear it. Her guest's cock thrusting into her flank added to her enjoyment: both the taboo feeling of being filled up — really filled up — through that hole, plus the physical stimulation of her pussy being squeezed and stretched by the movements behind, added to her pleasure.

A warmth building up inside her hindquarters, and her heart beating so hard it felt like it was trying to jump straight out of her chest, Twilight could tell that her climax was approaching. "Keep going, umm… Twilight!" she panted. "I'm nearly there!"

"I know!" Future Twilight replied through gritted teeth. She picked up her pace though, now furiously slamming her cock into Twilight's plot. That mare was going to feel sore in the morning… she knew… she could remember.

Twilight's hind legs spasmed as she came, but somehow she managed to avoid collapsing. The warmth that had been building up in her loins spread out in a wave of ecstasy that swept over her body. Her wings tensed up, trying to spread, but Future Twilight's hooves on her back held them in. Her plot clenched up — not just the opening itself, but muscles deep inside her were soon tightly squeezing her future self's cock.

Twilight's tightening anal passage was enough to push Future Twilight over the edge too. She groaned loudly and shuddered, rolling her eyes and unloading copious amounts of sticky but inert cum deep inside Twilight's bowels. She pumped a few last times, but was beginning to become exhausted.

Twilight grunted, feeling herself being filled with Future Twilight's warm liquid. When she felt the weight of her future self collapsing on top of her, her back legs buckled and she fell to the floor, the long cock still inside her, but beginning to soften and shrink a little.

After a moment, Future Twilight rolled off her conquest and lay beside her on the floor, recovering her breath. "Did you like that then?" she panted. She didn't even know why she was asking — she remembered it from last week — the initial feelings of pain and discomfort as her plot had adjusted to the futa cock's substantial girth, how she'd gradually become accustomed to the feeling of that thing thrusting inside her, and had eventually relished the feeling of it filling her up, firstly with its length and thickness, and finally with that warm creamy cum.

"Now, I need you to do something for me," Future Twilight announced.

"Something more?"

"What do you mean? It's not like you had to do anything there. I did all the work."

Twilight smirked at her future self. "But you are me."

Future Twilight rolled her eyes. "You know what I meant. Anyway," she said, getting back to the topic, "I need you to clean me up." She gestured towards her softened cock.

Twilight started to get up. "Okay, I'll just get—"

"With your mouth," Future Twilight clarified.

"Oh, okay," Twilight responded. She stood up and lowered her head to Future Twilight's cock. She gave it a tentative lick near the tip, and it pulsed beneath her tongue. "Like this?" she asked.

"Mhmm…" Future Twilight sighed, lying back. "That's a good start."

Twilight put her tongue to the base of the cock, and licked slowly up to the tip. It tasted weird — a mixture of sweat, cum, and… well… plot. But she didn't mind it. She opened her mouth and delicately nibbled at the base of the cock, close to where it met her future self's pussy.

Future Twilight sucked in breath sharply and then let out a sigh. "Mmmm…"

"Oh, you like that?" Twilight asked.

"Mhmm," Future Twilight confirmed, nodding.

Twilight smiled and returned to her work. She let her tongue trail down the length of Future Twilight's cock from the tip to the base, then brushed it over her pussy lips too, invoking a slight shudder from the futa princess.

She pressed harder, letting her tongue slide between Future Twilight's lower lips and penetrate her pussy. She allowed her tongue to linger inside for just a moment before licking upwards, along the length of Future Twilight's shaft to the tip.

Twilight looked up to Future Twilight, their eyes meeting. Twilight grinned for a second before letting her lips encircle the head of her counterpart's cock.

The futa mare moaned as Twilight gently sucked in her cock, taking the top few inches into her warm mouth. She stroked the soft hair of her past counterpart's mane, her hoof brushing against Twilight's horn.

"Mmmm…" Twilight moaned from the contact with her horn, the vibrations from her moan causing ripples of pleasure in Future Twilight's cock.

Future Twilight angled her hips upwards towards Twilight's mouth, and Twilight responded by trying to push as much of the large cock into her mouth as she could, the swollen head now resting against the back of her mouth.

Twilight drew the cock back out of her mouth and kissed her way back down to Future Twilight's pussy. She knew her way around a pussy — especially one as familiar as this one — the only complication being that her usual area to pay attention to, the clitoris, had been replaced by an oversized stallionhood.

But there were other ways a pussy could be pleasured. She lapped at the lips for a few moments before letting her tongue penetrate the deep hole in the centre. However, she soon felt Future Twilight's hooves on her head, guiding her back to her throbbing cock.

Twilight once again took the cock into her mouth, forming a tight circle with her lips and sliding them down the length of the shaft. Future Twilight held Twilight's head gently by the sides and guided her head up and down her cock, while rocking her hips slightly back and forth in time with Twilight's movements.

Twilight felt the tip of her future counterpart's cock press against the top of her throat, gagging at the sensation. "Just relax… it'll be okay," came the confident sounding voice of her future self. She knew her future self wouldn't be leading her into any serious harm because that would result in a paradox, but nevertheless felt nervous about what she could somehow sense Future Twilight was about to do.

Future Twilight held firmly onto the slightly younger mare's head and jerked her hips forward, the tip of her cock pushing into Twilight's throat. Twilight's eyes widened, a look of panic upon her face until she realized she could still breathe through her nose.

Her future counterpart held Twilight's head firmly and started thrusting up into her, with each thrust going a little deeper into Twilight's narrow throat. Twilight grunted with each push and soon Future Twilight's breaths became grunts as well, as she tried to hold back the feeling that was welling up in the base of her cock.

She lasted a couple of minutes more, thrusting into Twilight's face while trying to think of unsexy thoughts to hold off her inevitable orgasm and stretch out this experience for as long as possible, but she couldn't last forever — especially when she gazed down to see Twilight looking back up with those enormous purple eyes.

Future Twilight groaned, arching her back and giving a final thrust from her hips, forcing her cock down Twilight's neck as she came, unloading mouthfuls of sticky semen directly into Twilight's throat.

She released Twilight's head and Twilight came up gasping for air, a small trail of cum running down her chin. Twilight took a couple of breathless steps towards Future Twilight before collapsing to the ground beside Future Twilight, and rolling onto her back.

The two Twilight Sparkles lay on their backs, resting for a few moments. The eye-patched visitor turned to Twilight and said, "you know, having one of these between your legs gets kind of uncomfortable after a while. I mean, obviously I was told this about a week ago, but you don't really understand it until you try it."

"I'll try to remember that," Twilight answered.

Future Twilight's horn glowed and her cock started to shrink back into nothingness. The other Twilight watched it go with a hint of sadness. "Don't worry," Future Twilight reassured her, "we won't need it for what I have planned next."

"What's that then?" Twilight answered, propping herself up on one elbow and looking her future self in the eye.

"Oh, something I know you're going to enjoy very much." She put her hoof on Twilight's chest and pushed her onto her back, before standing up on all four hooves and positioning herself over Twilight.

Future Twilight nuzzled at Twilight's neck, rubbing her face in the short lavender fur. She kissed and licked her past self, even playfully biting her in places, her mouth moving slowly down towards Twilight's chest.

As her tongue moved over Twilight's barrel, she found one of her nipples hiding in her fur. She gave it a playful lick and felt the nipple instantly firm up beneath her touch. Twilight sighed happily when she gave it a few more little flicks with the tip of her tongue before continuing down the length of Twilight's body.

Twilight sighed when she felt Future Twilight's muzzle move over her lower abdomen. She tensed up in anticipation when she felt the warmth of her breath against her pussy lips.

Future Twilight made her wait a few moments before very slowly and gently running her tongue along the length of Twilight's pussy. Twilight shuddered.

Twilight's visitor used her hooves to gently spread the delicate lips that were in front of her, exposing Twilight's inner folds. Her tongue deftly caressed every inch of Twilight's pussy, before lightly flicking the clit, making Twilight shiver.

Future Twilight poked out her tongue and pushed it inside Twilight as far as it would go. Twilight involuntarily kicked her rear legs and gasped. Future Twilight curled her tongue upwards, scraping the front wall of Twilight's vagina. Her tongue returned to her own mouth and she swallowed Twilight's juices.

She repeated the process, penetrating Twilight's pussy and slowly withdrawing her tongue, using it to massage the walls of Twilight's private passage, over and over, as Twilight's breaths became hurried and irregular.

Once the alicorn princess was panting, Future Twilight used her broad tongue to lick Twilight's clit before wrapping her lips around it and sucking gently. Twilight inhaled sharply through her teeth, and wrapped her hind legs around the back of Future Twilight's neck, drawing her in.

Twilight rocked her hips rhythmically as her visitor from the future sucked her pussy harder, flicking at the clit with her tongue in time with Twilight's hip movements.

Twilight reached out with her forehooves to hold onto Future Twilight's head, giving her more leverage to thrust against the mare's face. "Harder," she panted, knowing that it would not take much more of this to push her over the edge.

Twilight forced her pussy hard against Future Twilight's muzzle while the latter did her best to keep sucking on her clit, though Future Twilight's efforts were mainly in vain now — Twilight was in control of the situation, not her. Whatever she was doing with her tongue and lips paled into insignificance compared to the rutting Twilight was giving her face.

The feeling of warmth returned to Twilight's loins — growing to an intense heat. With a final hard buck against Future Twilight's muzzle, she came, and the heat flushed her body, like flames licking her limbs, and shooting up her spine. Her wings shot out involuntarily, her feathers fanning out.

The warmth brought a blush to her cheeks as she released Future Twilight's head from her hooves. Her hind legs loosened their grip on Future Twilight's neck and the older mare came up gasping for air for a moment before returning to gently licking Twilight's pussy lips, each movement of her tongue against Twilight's now especially sensitive pussy sending a shiver up Twilight's spine.

After a minute or two of orgasmic bliss, Twilight put a hoof softly on Future Twilight's cheek, and guided her back up to lie beside her on the floor. The fur on Future Twilight's face was slick with sweat and marecum, and the two Twilights spent a few moments, wrapped in each other's embrace, kissing and licking each other's muzzles until they were both clean.

"I… I'm sorry about that." Twilight cringed, tucking her wings back in. "I don't really know what came over me there."

Future Twilight laughed. "I think I know what came over me!"

Twilight cringed even harder. "I don't mean that. I mean getting so… aggressive like that… it's not me at all. It's… sorry… it's more like something you'd do."

Future Twilight smiled. "Exactly… you're becoming me! Don't tell me that still surprises you."

"Heh." Twilight blushed. "Maybe a little."

"You silly mare," Future Twilight said, rolling on top of her past self. She pressed her crotch against Twilight's. "Ready for another round?" she asked.

"I thought you'd never ask," the younger mare replied.

Future Twilight arranged her hind legs so she had one leg between Twilight's and the other to Twilight's side, so her pussy was pressed against Twilight's upper leg, and vice versa. Putting her lips to Twilight's mouth, the two mares kissed, while Future Twilight began to rub their hind parts together.

Twilight felt the black cotton of her future self's outfit rubbing against her pussy. It felt dry and a little uncomfortable at first, but after a while her natural juices started to soak the fabric and it slid nicely against her.

The fur on Twilight's back leg tickled Future Twilight's clit when she rubbed herself against Twilight's thigh. She moved up and down at a regular pace and soon her pussy began to moisten too, the lubrication making Twilight's fur slick.

Future Twilight's tongue slipped inside Twilight's mouth and the two mares' oral muscles danced together  for a while before Future Twilight broke away. She kissed her way down Twilight's neck, nibbling gently and strained her neck to reach the base of Twilight's wings.

She used her muzzle to ruffle the feathers before licking them straight again, stimulating Twilight's powerful flight muscles with her tongue. Twilight shivered and let out a sigh. Future Twilight kissed her way across Twilight's barrel and did the same with Twilight's other wing, making Twilight moan and gently flutter her wings — as best she could lying on her back on the library floor anyway.

Future Twilight kissed her way back up Twilight's chest and neck to her lips again. The two Twilights kissed passionately while Future Twilight increased the speed of her movements, rubbing their thighs and pussies together faster.

The feeling of Twilight's fur against hers was delightful, but Future Twilight needed more. She lifted her hind leg and moved it across so that both her hind legs were now between Twilight's and their pussies could be brought together directly. She rubbed her nethers against Twilight's. They moaned together in perfect tandem as their clits brushed over each other.

Twilight moved a front hoof up to embrace Future Twilight, her tongue swirling in the older mare's mouth while she stroked her mane.

After a few moments, Future Twilight broke away, gasping for air. Twilight needed a breath too. Both mares panted, trying to catch their breath from the kiss, but failing as their increasingly frantic tribbing caused them to become even more out of breath.

Both Twilights began to feel their orgasms approaching. Each of them thrust harder and harder against the other's pussy. They each desperately tried to kiss the other's lips, cheeks, and neck between their deep and irregular breaths. Future Twilight pounded powerfully down on her past self; Twilight rocked her hips energetically up to meet her future self.

Finally they both let go, each simultaneously feeling a wave of hot pleasure sweep out from their pussy and flood their body from their hooves to the tip of the nose. Twilight's legs shook and Future Twilight's legs buckled, making her collapse onto Twilight in a tangled mess of legs, fur and marecum. Twilight grunted when the impact of the older mare knocked the wind out of her lungs.

They rolled to lie side by side, sighing, stroking each other's manes, and attempting to catch their breaths, occasionally giving each other happy kisses on the cheek and nuzzling each other's necks.

After a few minutes, Twilight rolled over to face away from her visitor. Future Twilight wrapped her legs around her younger self and they spooned for a while, with Future Twilight stroking Twilight's lavender fur, kissing her neck, and occasionally nibbling on an ear.

After close to an hour of blissful relaxation, Twilight sighed and turned to face Future Twilight. "So, I thought you said you were only here for a short time. It's been hours."

Future Twilight smiled. "Oh yeah, that might have been a teeny, tiny, little lie. I suppose I can tell you the real reason I came here."

Twilight propped herself up on one hoof. "Which is?" she asked.

Future Twilight kissed Twilight's muzzle. "Because I knew you'd love it."

"But how?" Twilight asked, furrowing her eyebrows.

Future Twilight stared at her in disbelief.

Twilight cringed yet again. "Oh yeah, of course."

Future Twilight smiled. Twilight was finally starting to get it.

Twilight lay back on the floor and rubbed her chin with a hoof. "Though I can't help thinking that when you were tearing into my plot, that was mainly for your benefit."

Future Twilight grinned. "Oh, it was. Tearing into that innocent naive mare's tight little arse… you're going to love doing that."

Twilight grinned too. "I can't wait!"

Selfcest really is best cest.