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In her lab Twilight has been very busy, thanks to all the new technology that they been grabbing from the different universes they been traveling to. Her team studies how they work and how hard it is to make, before they start producing the new technology themselves. It’s been allowing them to raise the quality of life for Equestria, as well as more importantly letting ponies being able to have their own human sex slaves.

Like Mercury who in her old world was the princess of her own planet, now is her and Moondancer’s personal sex slave. The now absolutely stacked short haired blue head who now has huge breasts bigger than her head and hips wider then her shoulders, not only is their sex toy but also helps them in their lab. Mercury helps her and Moondancer understand how some of the new technology that’s brought in works.

“So what is this?” Twilight asked staring at the strange cube that glows.

“It’s called energon, it’s the power source for a race of robots who are at war with each other. But like kerium, the highly energized red crystal from that universe with humans being able to travel around in space. The energon is mined and have a limited amount before it’s all gone. Good for short term but we need a fuel that’s renewable,” Mercury said having taken the lost of magic in her universe to heart.

“What about the bioreactor from that water world that composts organic matter?” Twilight ask.

“Yes it works but we do need to find a renewable energy source. I don’t want everything running on one power source that can be used up or like magic can be cut off,” Mercury said remember the time she and the others spent in the palace that only because of it having a non magical power source, kept the life support on while everyone else died once there was no more magic.

“Better to have more than one power source then,” Twilight said.

“Fuel that is finite, shouldn’t be the only power source. We seen enough worlds where that happen and what happen to mine,” Mercury said bringing up a screen showing the worlds or places that were dependent on one source of fuel or something like that to survive .

A world with giant robots called Gundams, where fossil fuels were running out and thus an alternative was needed. This led to the construction of a massive solar gathering array that circles the entire planet around the equator. However, this was disastrous for the middle east that relied on its oil for financial stability. With the solar power system up and running, it caused the once precious oil to lose much of its value. This led to a collapse of the region's economy and resulted in the brutal Solar Power Wars that would rage on and off for 20 years. And even after the wars have subsided, the region remains extremely unstable with things such as terrorism and the like running rampant. (1)

The desert planet Gunsmoke, where the Plants that look like giant lightbulbs that can produce fresh air, water, and other essential resources that are not readily available naturally on the plane, just all broke down. The people on the planet couldn’t make more and couldn’t repair the Plants anymore and their civilization just fell apart. (2)

Many, many vampire world where all non vampires are gone and with them only being able to feed on human blood, the vampires have all but died out. Equestrian forces are mopping up all the remaining vampires, with robots tossing their bodies into material recyclers to make sure there is no coming back to life as there is nothing left of their bodies to reform and done in worlds where there is no magic or anything supernatural, so there is no souls or spirits of the vampires as they can’t exist in the powerless worlds. The now vampire free worlds are being used to gather resources to help build the growing Equestrian Empire. (3)

One of the worlds that is so used up and over populated that cities effectively become their own totally isolated city states when the oil becomes too rare to use. The only form of travel mentioned are large freighters shipping food to the millions effectively trapped in cities. The government turns the bodies of the dead into food called Soylent Green.

“I still don’t get how that human world became so overpopulated? The humans had to have at least 10 kids who all live and keep doing it without care for that to happen,” Twilight said.

“Doesn’t make sense at all,” Mercury said. (4)

“But at least the government is trading the extra people for food and resources,” Twilight said.

The Soylent Green world governments once contacted have been sending child bearing aged women to Equestria for what they need to survive. Even having some women volunteering to have a better life as a sex slave, then having to live in an overpopulated hell they’re currently living in. Being a sex slave for many is viewed as a better standard of life, for they had no other chance of getting a better life for themselves otherwise.

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Elsewhere -

Mary Saotome walks with Yumeko Jabami both of them now have bodies that looked to be more like something out of a hentai. Massive breasts that are so tightly packed with fat and so firm, wide hips and massive juicy butts that clap when they walk. They’re also in charge of their mistress’s other sex slaves, thanks to them willingly to go along with being slaves and making a good impression with their mistress. In their hands they each carried a bottle of wine, which they have gotten for their mistress.

All of their old classmates are below them on the ground floor, with the guards and castle staff. Their screams and muffle cries echoed in the room, in groups the horse women raped the young women who have also been charged into their new hentai forms, allowing the horse women to rape them without fear of accidentally killing them. Thanks to their bodies being made to be able to endure and expand, so that instead of ripping apart when giant horse cocks are shoved inside of them, their bodies can stretch.

The twins Kirari and Ririka Momobami are each being taken from behind by massive horse women pumping their giant cocks into their cum filled cunts. Their massive breasts flatten and bulged as they’re forced to give a third horse woman a boob job, using their hands to rub their breasts on her massive cock. Their faces are shove up against a forth massive cock, making the sisters lick and suck on it as they’re being taken from behind.

Sayaka Igarashi is being triple-teamed by a trio of horse women at once. They were slamming their giant dicks into her asshole, pussy, and mouth with reckless abandon, violently making her body theirs.

Runa Yomotsuki has a horse woman pumping her giant cock into her overused cunt as she lays on her back. A second horse woman is sitting on her face, making her lick her asshole, while having her cock between Rena’s massive breasts. Her powerful hands are squeezing the globes of fat as she moves them around on her cock.

Yumemi Yumemite is being taken by four horse women at once. Laying on her back with a giant cock buried in her cunt, butt, mouth, and one sitting on her chest fucking her breasts.

Midari Ikishima is literally being squeezed to death as two massive horse women are crushing her body between their massive bodies. Their giant cocks are squeezed tightly as she slowly is smothered between them, only to stop as they stop letting her catch her breath before they start all over again.

Yuriko Nishinotouin is impaled on an oversized cock buried up her cunt, another cock is shoved down her mouth, her hands are busy jerking off two other cocks that her hands can’t even wrap around their girth.

Itsuki Sumeragi is being eaten out by two mares as they sucks out all the cum from her cunt and asshole, as she hangs upside down and between them and licks their cocks that are rubbing up against her face.

Terano Totobami is impaled on a mare sitting on a chair, being pump up and down on by the much larger mare’s powerful arms. Using her massive breasts as handholds as the mare enjoys playing with them.

Yumi Totobami is licking both her cousin's cunt and the mare’s cock as two mares are holding her up sideways and are raping her cunts and butt.

Erimi Mushibami is completely buried underneath a group of 4 massive horse woman as she is raped. The only part that could be seen is her right leg as the four horse women thrust into her small body beneath them.

Miyo Inbami and her sister Miri Youbami are lock in a 69 position as they are out each others cum filled cunts. They’re laying on top of a massive mare's body who has her giant cock stuff up Milo’s butt, and on top of Miri is another mare thrusting her giant cock into the much smaller human female’s butt.

Miroslava Honebami has two mares giant cocks stuff in her cunt at the same time as they held her between them sideways, while they suckle on her now giant breasts. She was the most endowed girl in the breast department before she was changed like all the others and now her breasts are the same size as some of the much larger mares. A third mare has her even bigger cock stuff up the icy human female’s butt, causing her to scream out as she’s raped by the three mares.

Sumika Warakubami is on her back and her legs on the shoulders of the mare who is thrusting her massive cock into her cunt. A group of five mares are jerking themselves off as they covered the human female’s face with their thick cum.

Nozomi Komabami is sobbing as the mare that’s been raping her ruined cunt cums deep inside her womb, filling her insides with her thick cum and making her already bulging belly expand even more. The mare quickly pulls out her long and thick horse cock out of her full cunt, and quickly replaced by another mare who began raping her just as hard. The group of mares around the lair are all waiting their turn, doing their best to see how much cum they could pump into the human female’s womb.

Rei Batsubam is on her hands and knees as she is spit roasted between two mares thrusting their massive cocks in and out of her cunt and mouth. The only thing holding her up are the two massive cocks lodged deep in her mouth and cunt.

Both Mary and Yumeko observed the sheer menagerie of orgy happening below them. They couldn’t set their vision in any direction without beholding one of their old classmates suffering vicious ravishment. Their mistress had the girls all gathered in the middle of the room before letting her guards and servants go at them.

They were hunted down like fleeing deer by wolves and then violated wherever they were captured. The horse women storm over them like lions and once they were both on the ground, maneuver their raging massive horse dick in-between the human female’s legs and start furiously pumping. The horse women simply wanted to fuck and destroy with every savage impulse that sprung through their cocks. Invariably, the defiled women would writhe and scream upon being mercilessly raped. Many of the nubile, gorgeous young women were even being ravaged by multiple assailants at once, as their number far exceeded that of the human women.

Sitting on a throne enjoying the sight of the orgy going on below her, is Luna the night queen. Her massive cock, is covered in the sex juices of both Mary and Yumeko before she sent them to get her two bottles of wine. Giving them time to rest and empty out their holes of her thick cum, so she could fill them all over again.

“We have your wine,” Yumeko said.

“Good, Mary you pour me wine, while Yumeko sits on my lap,” Luna said.

Without a word Mary began pouring a glass of wine for her mistress, while Yumeko impaled herself onto their mistress’s massive horse dick. Yumeko sat facing her mistress as she slowly sank her body down on her cock. Her cunt clinging to her mistress cock while she stared lovingly at her face. Yumeko began pumping her hips as she fucks herself on her mistress’s massive horse cock and buried her head between Lina’s massive breasts, disappearing between them.

Luna took the glass of wine from Mary and took a drink from it. She turns her attention back to the orgy going on below her. Both Yumeko and Mary know their place, while their classmates needed to be broken and trained. Once they been fuck long enough to mind break them and their bodies become addicted to cum that is only produced by Equestrian cocks, they will fall in line. For now she’ll enjoy watching her guards and servants break them both in body and their minds. And once they’re good and broken, she’ll will truly break them so that they will be the prefect slaves.

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Author's Note

1 - Once the main reason why the Middle East is rich with more than half of its exports being oil is gone, what you really think would happen?

2 - Trigun in a future where the Plants all broke down due to age and nothing to replace them. And where no new technology is created or a way to get off the planet to find a greener world.

3 - I hate vampire fiction that makes the vampires so overpowered that even killing them they just come back, because of plot armor. So the ponies are destroying their bodies in a way that can’t have the vampires reforming as the material recyclers break down their bodies on the atomic scale and remake them into green cubes and done in a world where there is no magic or souls. So no ghosts or spirits of vampires. Leaving the vampires no matter what kind dead and gone for good. As the whole being able to come back to life even without a body because of the vampire spirit, doesn’t work in a universe that doesn’t have souls to begin with. It be like trying to light a match underwater in real life.

4 - There really should be fictions made that has underpopulation as the main problem. Seeing how in real life many countries are facing the ever shrinking population with fewer births and too many old people. As for places that have too many people, that’s not overpopulation, that’s overcrowding in one place.