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Once Upon a time, the Pegasi, Unicorns, and Earth Ponies hated each other. The Pegasi, led by Commander Hurricane, believed themselves superior because they could control the weather. The Unicorns, ruled by a queen who is represented by her daughter Princess Platinum (who the queen is and why she didn't come herself is never explained), believed themselves superior because they had magic, which they used to move the sun and moon. Both tribes demanded food from the Earth Ponies, led by Chancellor Puddinghead. (1)

One year, an inexplicable blizzard came to their land, and the ground was frozen so hard that the Earth Ponies could not cultivate. Neither the Pegasi nor the Unicorns could banish the storm, so the three clans held a summit, trying to figure out a solution. But with the storm raging outside reflecting the ponies' conflict inside, it didn't take long for the leaders to angrily give up and return home. The second-in-commands of each group — Pegasus Private Pansy, Unicorn vizier and student of Starswirl the Bearded Clover the Clever, and Earth Pony secretary Smart Cookie — were disappointed at the news.

Individually, each leader decided to leave their desolate wasteland and find a new realm to live. The parties soon found a beautiful paradise with a diverse landscape, beautifully thick clouds, and fertile soil. Unfortunately, they had all chosen the same land, and soon the fighting between the three leaders resumed with increased fervor. As their bickering increased, the blizzard they had left behind started up once again, forcing the six ponies to seek shelter in a cave.

Even the plight of their situation didn't deter the hostilities; as the blizzard grew worse, the leaders' petty bickering continued, until the ice encroached so far into the cave that the commander, the princess, and the chancellor were frozen over in mid-rant. Unfettered by their bosses, the seconds admitted that they had hoped for peace and friendship. Clover the Clever realized that the blizzard was created by windigos, supernatural creatures that thrive on hate and fighting, and that the coldness of their hearts had brought the disaster on themselves. Just as the ice was about to completely imprison the seconds, the spark of their friendship suddenly ignited, saving them and driving back the windigos.

Seizing the opportunity, the three nurtured the warmth of their friendship with stories and laughter and singing, eventually thawing out their leaders. With everypony realizing that friendship and cooperation succeeded where arguing and fighting had not, the three tribes agreed to come together in harmony, thus forming Equestria on the principle that all ponies are equal. Cue a closing song, the curtain call, and enthusiastic applause from the audience.

That was how Sunset remembers the same old play, and not the play she’s watching now with her family. She’s sitting with her family in the royal box in the grandest theater in Canterlot where she’s watching the play. She sat between her mothers, Celestia and Molestia, both sitting on a large enough sofa for both of them to sit on together and with her sitting on both of their laps, using their soft voluptuous bodies as her sofa. Her aunts are sitting on another sofa and Cadance and Shining Armor sat on theirs.

The play has the 3 tribes only having sex with only members of their own tribes. The plot of the play went the same with the tribes all fighting each other, causing the windigos to come and freeze the land. Which ended when the second in commands began having sex with each other, which cause the heat of their orgy to melt the ice trapping their leaders who joined the orgy.

With the play over the audience began leaving for the main hall of the theater that has been opened up for the orgy. Where all are welcome to join in.

“Now to join the orgy,” Celestia said as she and Molestia walk together with Sunset between them.

Entering the main hall the orgy is already going on as the ponies took off what little clothing they wore and paired off or got into the growing piles of bodies. Sunset’s eyes widen as she sees the sex oil made from her sweat being used all around the room, the scent driving the mares in the room to a sexual frenzy. A daisy chain has formed with mares thrusting their cocks into the cunt or anus of the pony in front of her while another mare is thrusting into her from behind. A ring has formed a larger 69 where a mare has her cock being sucked on while she sucks another mares cock, the ring has 10 mares in it.

“So how do you want to do this?” Molestia ask Sunset as she and Celestia kept her between them for protection.

“We triple stuff a pony between us and have her be brain fuck by our cocks rubbing up against each other inside of her,” Sunset said who loves to feel her mom’s cocks rubbing up against her own cock.

“Oh my, you certainly like our cocks rubbing up against yours,” Celestia said.

“How about we show you real loving?” Molestia ask looking down with lust at her cute daughter.

“I….,” Sunset said as she thinks about having sex with her moms.

“We can let you be the one with the cock and fuck us,” Molestia suggested.

“Can we all not have cocks,” Sunset ask as she can feel the lust from both of her moms as they closed in on around her.

“Of course, long as your comfortable with us,” Celestia said as she held Sunset in her arms pressing her mountainous breasts against Sunset who is quickly smothered between her and Molestia who hugs her from the other side. Their gigantic breasts smothering their daughter's smaller breasts as they took turns deeply kissing her.

“Luna, Moon you two cover for us. We have some bonding to do with Sunset,” Molestia said to her other sisters who nodded seeing that both sun sisters needed to strike while the iron is hot.

“Have fun,” Luna said as the mothers and daughter teleported away.

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Royal bedroom -

Laying back on the bed naked Sunset couldn’t help but blush as she stares at her mother’s naked before her. Their absurdly large breasts defied gravity, their long abdomens rippled with muscles, their long legs stepping with the grace of ballerina but the strength of a bull supporting their massive butts and wide hips. And unlike before both have their wet cunts on full display, no longer having their massive cocks and balls blocking the view.

“Ready Sunset?” Celestia ask gazing down at her daughter’s young and nubile body compared to her voluptuous body.

“Yes,” Sunset said blushing deeply.

“Good just lay back and let us show you that we’re not only skilled in using our cocks,” Molestia said as she and Celestia have had sex with females who didn’t want to have sex with them with cocks before. So a simple spell to get rid of their cocks and balls and they could enjoy having lesbian sex.

The two lay down on the bed with Sunset between them, Celestia on the right and Molestia on the left each took one of Sunset’s breasts in their mouths and suckled on her breasts. Each of them reached down and played with her wet cunt and played with her clit, causing Sunset to moan in pleasure as her moms played with her body and made her cum the first of many.

Her mothers maintain their playing with her body for nearly an hour and made her cum repeatedly, before they decided to change positions. They slowly pulled their mouths off of Sunset’s breasts and moved down so that their faces were facing Sunset’s soaked cunt.

“Now we’re going to show you have to lick pussy and when it’s your turn you do the same with us,” Molestia said as she and Celestia lean down and began licking at their daughter’s cunt. They took turns burying their long thick and powerful tongues deep into Sunset’s sweet cunt lapping away at her cunt walls, making her cum and giving them more sweet juices to lap up.

Finally the two stop and Molestia picks up Sunset and brings her face to her breast. Sunset opens her mouth and began drinking her mom’s rich milk to restore her stamina and rehydrate her. Molestia pulled Sunset off of her breast and presented her with the view of Celesita laying back on the bed with her legs spread ready for Sunset to eat her out. Sunset crawled between her mom’s legs and began licking her mom’s dripping cunt and nibbling her clit. Molestia watch ad Sunset cute butt wiggling in the air as Celestia’s large breasts heaved with excited breathes.

Molestia kneels down and press her body on Sunset’s back her massive breasts resting on her back. Her hands strokes her body as she watches Sunset licks Celestia’s cunt. Whispering into Sunset’s ears about what to do as she plays with her body, telling her exactly how to make Celestia cum.

Celestia took her revenge on Molestia when it was her turn to be eaten out. Molestia laid on her back as Sunset 69 her but because of the size difference, Sunset’s cunt was nowhere close to her mouth so she just fingered her daughter’s cunt instead. Celestia suddenly kneels down on top of her in a 69 position with her cunt right in Molestia’s face as she traps Sunset between their larger bodies. Celesita pressed down on Sunset and joins her eating out Molestia teaching her by example as Molestia cums beneath them.

Together the two mothers taught their daughter the art of lesbian sex throughout the night. Sunset scissoring by both Celestia and Molestia, making her cum like crazy till it was her turn to show them what she learned. Which took her several tries before she got it right by their standards and each failed attempt, they showed her how it was done with intense and pleasurable hands on teaching.

Sunset buried her face between the huge soft butt cheeks of her mothers as they lay on their stomachs and moan as Sunset ate them out. Followed by her fingering both of their cunts at the same time with them telling her how to finger a cunt. Being held in the arms of her mother’s as one breasts feeds her while the other eats her out. Sharing a 3 way kiss being engulf in the soft flesh of her mothers.

Her mothers proved to be harsh task masters as they kept Sunset cumming for hours and making her show them what she learned. Taking great pleasure in showing her what to do with her body before she had to show them what she learned with her body. They stop when it was time for the sun to be risen.

“Sunset is a fast learner,” Celestia said as she and Molestia lay sideways on the bed with Sunset between them. Sunset was completely exhausted and worn out from all the sex she had with her moms.

“So sweet and tasty,” Molestia said watching Sunset sleep, covered in their combine sex juices and sweat.

“Yes she is,” Celestia agrees, her musk so over powering that it took her iron will from grabbing and taking Sunset. Helped by the image of Sunset when she was still human skin and bones and her being the reason why Sunset was trap in the vault.

“How long you think for her to be comfortable enough for us to use our cocks?” Molestia ask.

“Give it time, we just scared her when we’re forceful,” Celestia said.

“I can’t wait for her licking our cocks and us showing her how to really fuck,” Molestia said licking her lips.

“I would like that but I’m fine with having sex with her without them,” Celestia said.

“You’re right, we just take it nice and slow,” Molestia said.

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Author's Note

1 - The show never did explain if the sun and moon could be moved by the ancient unicorns, why is that spell gone by the time of the princesses. Even if it fell into disuse there should be scrolls and books about how to cast that spell.