"Okay, but this makes no sense. You're not my parents?" Rainbow Dash said, and looked between Bow Hothoof and Windy Whistles. "But your manes are, like— Your manes are really like mine. And you're both pegasi. And…" She trailed off at seeing the honesty in the faces of the two ponies who had raised her. "Who am I?"

"Rainbow Dash." Twilight Sparkle, Princess of Friendship, put a hoof on her friend's shoulder. "You're the best flier in all of Equestria. You're a Wonderbolt. You carried, and still embody, the Element of Loyalty. And you're best friends with a princess."

Looking at Twilight Sparkle, Rainbow Dash rolled her eyes and reached up to hug her friend. "You're such an egg-head sometimes."

Twilight Sparkle kept her friend in a hug while she looked over Rainbow Dash's shoulder to Bow Hothoof and Windy Whistles. "Who are Rainbow Dash's parents?"

"That's the confusing part. You both are, kinda." Bow Hothoof gestured to Rainbow Dash and Twilight Sparkle.

"But not, at the same time." Windy Whistles preferred a scroll. "It's all in this note."

With her magic, Twilight Sparkle collected the scroll from Windy Whistles and quickly unrolled it. Then she froze and looked up at Windy. "This is a scroll I wrote." Windy nodded to Twilight's not-question. "But I haven't written it yet." Another nod. "Time travel."

"Time travel? Oh no. This stuff always confuses me." Rainbow Dash let go of Twilight Sparkle and took to the air. Hovering just above and beside her friend, Rainbow shook her head. "I can never work this stuff out. Is this the kinda time travel that makes it so that all the things that have happened have actually happened? Or is it the type that can rip the world apart if done wrong, and we have to go fix something to—" She cut off mid sentence, lifting a hoof to the side of her head. "Did I say this stuff confuses me?"

"According to this letter, I send you back in time with another letter that says—" Twilight Sparkle abruptly stopped and gasped. "Okay, I am not allowed to tell you that until you read the letter. But you need to go back in time to a year before your birth, come back to now, then we— Oh come on! I'm not allowed to tell you that, either?"

Rainbow Dash saw the consternation on her friend's face and landed. "Are you sure this is your plan, Twilight? This is the first kind of time travel, isn't it?" Twilight Sparkle just nodded to Rainbow. "Alright. So we have to do this because it has already happened. Future-you must have a really good explanation for this, and I trust you, Twilight."

Twilight Sparkle rolled the scroll up and used her magic to summon more writing implements with a pair of little POMF sounds. She quickly scrawled the first note, shook her head, and rewrote it. "This is the,"—Twilight paused a moment to think—"seventh craziest thing I have ever had to write down." She rolled up the scroll and passed it to Rainbow Dash with her magic.

"So now you send me to a year before I was born? How does this work?" Rainbow Dash was tempted to open the scroll right away, but trusted her egg-head friend to know what was right.

"It's all in the letter." Princess Twilight Sparkle charged her magic. Time travel was a tricky thing if the unicorn themselves intended to do things, but sending a single other pony back was just about the simplest spell ever. Aiming her horn at Rainbow Dash, Twilight unleashed the spell.

"Ugh." Rainbow Dash compressed all the horribleness of time travel into one utterance. She tried to lift her head and found a minor headache coming on. Forcing her eyes open, she realized she was in a house—a cloud house.

"Twilight really needs to work on that spell." Lifting a hoof to her head, Rainbow Dash remembered the scroll tucked under one wing.

Unfolding the letter, Rainbow Dash noticed it wasn't overly long.

Rainbow Dash. The pony waiting at the front door, about to knock, is the father of you. You're your own mother. Don't ask how it works, pony genetics are crazy. Just trust them, trust yourself, and trust me. Twilight Sparkle, Princess of Friendship.

A knock came at the door. It cut through Rainbow Dash's empty, spinning mind like a blade. She was her own mother. It was one of those crazy time travel concepts that she didn't usually bother thinking about. "This is bucked up."

The knock came from the door again, and Rainbow Dash walked over on stiff legs, and opened the door. "Oh no."

"Yeah. This is bucked up." Rainbow Dash looked at Rainbow Dash. "Twilight gave me, you, the letter. I, you, read it?"

"But you're—" Rainbow Dash trailed off, staring at her double. She noticed some odd things about the other Rainbow Dash. "You look older."

"Just, like, a year. Can we talk inside, I don't think we are meant to let anypony see me, us." Rainbow Dash deadpanned at Rainbow Dash until Rainbow Dash got out of the way and let Rainbow Dash inside. "Thanks."

"Don't mention it. Err, I won't mention it. Will we ever mention it?" Rainbow Dash was still confused about the scroll, and picked it back up from where she had inadvertently dropped it. "Twilight has finally gone off the deep end, I take it?"

"No. This is how it's meant to be. I think." Rainbow Dash lifted her hoof and rubbed at her head. "Time travel is really confusing, but it was just a year ago that I was standing there, letting me, you, another me, you…"

Both Rainbow Dashes looked at each other and groaned.

"So I'm my own mother." Rainbow Dash reread the note.

"And I'm my own father." Rainbow Dash watched her younger self read the note.

"This is kookier even than Twilight's normal stuff. How's it even meant to work? We're both mares…" Rainbow Dash put the scroll down, at last, realizing it held nothing that could be deemed a coherent answer.

Rainbow Dash slumped into a chair. "Guess how this would become more complicated."

Both Rainbow Dashes stared at each other for a full ten seconds before a grin lit up both their faces. At the same time, both said, "Twilight Sparkle."

Laughter echoed around the house. Both Rainbow Dashes fell to their sides giggling. The youngest Rainbow Dash, however, froze mid-laugh. She stared at the older Rainbow Dash. "She did that?" She gestured with a wing, fearful that if she brought attention to Rainbow Dash's lower belly that it would make things more real.

"It's not so bad. But yeah, the crazy egg-head did this." Rainbow Dash curled her leg over the sheath she sported with a little embarrassment. "I can't believe all of it, but it happened. I had, and you will have, us."

Rainbow Dash turned her head away from Rainbow Dash so that she couldn't even think the word penis (of course, it was too late). "And then what, I give you, me—"

Rainbow Dash shoved a forehoof into Rainbow Dash's mouth. "Don't do the pronoun thing." She waited until Rainbow Dash nodded to remove the hoof. "I'm a mother, Rainbow Dash. You'll be a mother."

"It's awesome?" Rainbow Dash asked.

"Yeah. It's totally awesome." Rainbow Dash smiled, her mind racing through the better part of a year of pregnancy, and then having her foal, and nursing her for the first time. She wasn't sure how long had passed while she reminisced, but the look on Rainbow Dash's face let Rainbow Dash know it had been a while.

"So you're going to— And I'm going to— We're going to have—?" Rainbow Dash was still getting around the idea, not actually able to say sex yet, but getting really close. Rainbow Dash nodded to her. "Well I guess if I am going to lose my virginity to a pony, it's going to be the best flier in all Equestria."

"Heck yes!" Rainbow Dash pumped a hoof in the air, then froze. She suddenly realized what she had to do, the role she had to take. "So… How does this work?"

"You already did it!" Rainbow Dash pointed a hoof at Rainbow Dash. "Just—Just do it from the other way."

"I remember saying that. It doesn't help." Rainbow Dash blushed and looked at Rainbow Dash. If there was ever a mare that could turn Rainbow Dash on, it was one built for speed. What some would call small, Rainbow Dash called aerodynamic; her body was tight, fast, and perfect. By the time Rainbow Dash got to Rainbow Dash's wings, she didn't even realize her shaft was starting to slide free.

Rainbow Dash stared at Rainbow Dash. She had never even really thought of any stallion as hot, they were all big and slow, and couldn't even try to keep up with her. Rainbow Dash, on the other hoof, was built for speed. Rainbow Dash's lips curled up as she thought naughty things. "So, how fast can you fly?"

"Ha! Funny you should ask." Rainbow Dash, feeling her "oats" rise, pranced around Rainbow Dash, and her eyes fixated on Rainbow Dash's rump. "I can clear the skies in ten—seconds—flat." The last she said leaning over Rainbow Dash's back, her lips at Rainbow Dash's ear.

Rainbow Dash shuddered as Rainbow Dash seemed to suddenly act like a stallion. It was a change that inspired her own body to counter. She fluffed out her wings and turned her head so that she was almost snout-to-snout with Rainbow Dash. "Ten seconds? I bet I could do it in nine."

A challenge to Rainbow Dash's ego wouldn't pass except when issued by one pony, Rainbow Dash. "You gonna prove that, newbie?"

Her mind flooded with the thoughts of a mare with a stallion she really likes (and who did Rainbow Dash like more than Rainbow Dash?), Rainbow Dash turned slightly, putting her back end between her and Rainbow Dash. "That depends." Rainbow Dash looked over her shoulder and fluffed her wings out a little more. "Prove to me that you are worth the effort."

Rainbow Dash backed up a little and leaned down. She could remember behaving much the same, getting horny and excited at her first time. This wasn't her first time, though. Rainbow Dash opened her mouth and bit down on Rainbow Dash's dock.

Arching her spine, Rainbow Dash let out a low moan of excitement. The pressure and presence of teeth on her dock was a signal to the oldest parts of Rainbow Dash's brain that the stallion behind her meant business. Unconsciously, she braced her back legs a little wider, jerked her dock to the side, and winked at Rainbow Dash (yes anatomy lovers, that kind of wink).

Rainbow Dash was rock hard. Her body screamed that the mare before her was ready, but there was one thing her instincts drove her to. Shoving her nose against Rainbow Dash's vulva, Rainbow Dash inhaled deeply. The more thinky-thinky parts of Rainbow Dash's brain became drowned in lust. She closed her eyes and took another, long sniff.

Having had enough now, Rainbow Dash jerked her head up from Rainbow Dash's nethers, and mounted Rainbow Dash. Instinct drove her to buck and shove forward, but what little of Rainbow Dash could still think beyond "buck the mare" realized she wasn't in the hole, any hole. Jerking backward, Rainbow Dash took another stab. Then another.

"You can't even get it lined up right? What are—" Rainbow Dash's complaints were torn from her throat. She arched her neck and tilted her chin up to moan. She felt full. Stuffed. Rainbow Dash had never had a stallion take her, but suddenly she was very much in favor of stallions taking her.

Rainbow Dash's body knew exactly what to do, but before she could even start the mare under her started moaning and squealing. Realization dawned, Rainbow Dash had gotten Rainbow Dash to climax in under ten seconds flat. She waited, memories of her first time with a stallion (herself, of course) reminding her how sensitive she had been. It took everything Rainbow Dash had not to let her body take over again.

Squirming, struggling, even fighting did Rainbow Dash no good. Her body had complete hold, and it was intent on shoving lightning strikes of pleasure through her loins like Derpy bouncing on a thundercloud. She trembled and shook under Rainbow Dash, and when the waves of her first, overeager orgasm died down, she managed to get two words out: "Buck me."

Rainbow Dash didn't have to wait, but when Rainbow Dash shoved herself forward, she felt the full magnitude of Rainbow Dash's shaft push into her. She had been sold a lie by her body; Rainbow Dash hadn't been full before, she hadn't even been halfway there.

Rainbow Dash bucked her hips again and again, stuffing Rainbow Dash's body with everything she had. She couldn't and wouldn't hold back, not for Rainbow Dash. The one mare that could compete with her, the one mare who would have a hope of beating her, and she was screwing her as hard as she could. Rainbow Dash let out a yell of excitement.

Each stroke was heaven. Rainbow Dash didn't give in completely, instead flapping her wings in time with Rainbow Dash's thrusts. She wanted this more than ever, now, just because of how good it felt to have a mare like Rainbow Dash riding her back.

A sudden boiling pressure rose in Rainbow Dash. She was nearing her end, she knew, and her body felt like it had been built with one moment as the goal. The pressure grew yet higher, and her bucking hips seemed to collide with Rainbow Dash's rump at just the right time for the pressure to explode.

Heat rushed into Rainbow Dash; she had no other way to describe the sensation. The mare on her back grabbed at her sides with her forelegs, and Rainbow Dash felt shorter, sharper bucks drive their bodies as close as close could be. The heat grew yet higher, and it triggered another orgasm.

Rainbow Dash's world whited out completely, although she realized she had just closed her eyes. When Rainbow Dash exploded inside her, it was like the explosion continued into her body. The orgasm that took all her senses away dwarfed the earlier one. She felt complete.

Flapping her wings weakly, Rainbow Dash held tight to Rainbow Dash's back. Her shaft was buried as deep as her lightning-fast hips could drive it, and she felt contentment that she, Rainbow Dash, had found a mate worthy. That the mate was herself just stoked her ego a little further.

Both mares panted, huffed, and groaned as their orgasms played out. Rainbow Dash, pinned under Rainbow Dash since her legs had folded, let out a sigh. "So now I hang out here while I—I'm going to have a foal!"

"There's something else, first." Rainbow Dash leaned forward and nibbled Rainbow Dash's ear, enjoying the way it tried to pull free of her teeth.

Tilting her head to the side to attempt to free her ear, Rainbow Dash couldn't stop a laugh at Rainbow Dash's playfulness. "What?"

"We have to make sure you're pregnant." Rainbow Dash spoke low, her tone deep and full of promise. "How many times do you think, to be sure?"

"Well, we have a few months before I have to be pregnant, right?" Rainbow Dash shifted a little under Rainbow Dash. "What I'm sayin' is, no need to rush things."

Rainbow Dash laughed and gave a small buck against her lover's rump. "Now I know why Twilight was so frazzled when I got back. I wonder if she might be into us, me, err…"

"Don't do the pronoun thing." Rainbow Dash got half a laugh out before Rainbow Dash jerked her up, and their laughter was lost into moans moments later.

Author's Note

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Awesome ponies who are already helping to keep me in keyboards and rum:
A.P.O.N.I.
Boulder
Canary in the Coal Mine
CrimsonPhoenix
Daremo
Dio-Drogynous
Javarod
Nils
Shaushka
Sirion123
Tanis

And special thanks to the following, for careful eyes and friendly words:
Cross Lament
Vutava