Rin Tohsaka knew that there was something wrong with Fuyuki City, the entire town had gotten strange over the last few months.

Things had gotten a lot more lewd, and people had started changing, with no one but her seeming to acknowledge things had changed.

She didn't know what was responsible for it, but she had been investigating for the past few months, but so far, the fifteen-year-old Magus have had no luck; instead, she had just hit dead after dead.

And it was not like the Fake Priest was of any help. He or rather she now was interested in jerking off that big futa cock of hers and playing with her large milky tits, but Rin had to admit it was a rather nice cock as she liked Kirei thrusting it in and out of her ass.

An ass that had gotten a lot bigger over the past few months, alongside her thighs, and breasts, those now stretching out her shirts and sweaters nicely. Highlighting her much larger nipples that were constantly erect.

And right now, Rin was once again on the prowl, looking for the source of the corruptive Miasma that had mixed itself in with the mana in the air.

Rin walked through the streets of Fuyuki with the detector she had made in hand as she tried to ignore the acts of lewdness that were happening all around her. She could see a mother giving her hung son a blowjob. A young girl getting railed by her dog, her many titties jiggling as they hung from her torso, her belly probably pregnant with its puppies.

Rin was at this point kind of surprised that she was not pregnant at this point like so many of her classmates were. She had seen the size of Emiya's big belly, and Shinji's too, the boy-turned-rat girl always emptying her milk-filled breast.

Which was, at this point, starting to become a very common thing, Fuyuki, everybody getting animal parts, and becoming Futas from either side of the gender spectrum.

However, as she walked, the detector in her hand suddenly started beeping, meaning that it had detected a large amount of the Miasma in one area.

It's the source! Rin mentally shouted as she quickly set off in the direction of where it was detecting it, which resulted in her having to get onto a building's rooftop.

And there Rin saw a scene of debauchery and delight as a massive anthropomorphic canine thrusted a gigantic doggy cock into the pussy of a young girl stretching out her stomach like a condom while several young boys suckled on her manny lactating tits, the cocks between their legs growing in size as they did.

Rin's pussy was inflamed from the sight and the smell of cum, milk, and gushing pussy juice from the girl who could only be eight years old, her face contorted into pleasure as her body was adorned with her fur, her face becoming just as canine as her rapist as many tits grew on her torso and ballooned out, spewing out jets of milk.

All the while, Rin masturbated to the sight of this Goddess of Fertility, Sex, Change, and Corruption, violating her fellow human.

After a minute, the wolf woman came, showing the fat knot that had been smacking against the girl's pussy fully inside as the amount of cum turned her into a balloon.

It was over ten minutes later before the God pulled out of the now fully anthropomorphized girl and turned to look at Rin, who had shoved an entire hand into her pussy while her other hand pulled at an engorged nipple.

"Hello Rin Tohsaka, you've been looking for me," The Goddess spoke. "And now you found me, Iris, the source of Fuyuki's changes." A moan left Rin's throat as the anthropomorphic Goddess got closer to the young Magus; the lust filling her body was going out of control now as she stared hungrily at the canine shaft that bobbed in front of her face erotically. "And for that, you deserve a reward, don't you think so?"

Rin's mind was too addled to answer or resist being picked up by the much larger futa.

"You're such a cutie Rin," Iris spoke as she aligned her massive canine cock with Rin's ass and slowly began showing the Magus down her length.

"Ahh!" Rin moaned loudly as she came several times over from having her ass penetrated by the gigantic dog penis, her pussy gushing, squirting all over the God's crotch as more and more of the two-foot-long cock made its way up her intestines.

It was a thing that should not be possible as her intestines would have been crushed by being stretched out by the giant cock.

"Hmm, what an excellent cock sleeve that you are, Rin," Iris spoke as she started moving Rin up and down her cock as she started using the fifteen-year-old like an onahole. "Oh yes, such a perfect sex toy."

Rin didn't answer. She had already lost consciousness from the pleasure as it was not something her mind could comprehend.

So Iris just continued to use the girl like a toy until the futanari wolf goddess came, and she came a lot, making the white stuff spill out of Rin's mouth. The stuff flowing over her body as it was turned into a sphere from the amount, her now much stretchier body easily able to handle it.

But then she was done with her; Iris just pulled Rin off her cock and dropped her to the roof, and left, letting her bath in her cum.

Cum that Rin's body soon collapsed as her entire body dissolved into a red liquid, a liquid that was fusing with the cum.

A few hours later, Rin regained consciousness, and the first thing she noticed was that she was red.

The second that was she was see through.

The third was a distinct lack of legs.

The fourth was she could see her core in her newly formed body, a body that was now made of red goo and that was also carrying a bunch of much smaller cores.

For Rin had been turned into a Red Slime Girl by Iris, a very pregnant Slime Girl, as that were all the babies that she was currently carrying.

Which was about a dozen or so.

Which meant she needed to get more mass to feed.

As at this point, Rin's thoroughly broken mind only carried about her babies, and if she were to give birth to them, she needed a lot more mass.

And so she went out to get it and bring it back home, which was both food and a homeless boy who could feel her the cum she desired.

Who quickly transformed into a minotaur who loved to use Rin like a fuckable onahole, and nine months later, he got the opportunity to take the virginities of all of Rin's daughters.

Xxx

"Ahh," Sakura Matou moaned as she woke up to bliss, a change from how her life had been a few years ago, but now life was good and was all thanks to Iris.

The Wolf Goddess of Fuyuki had saved her life, and she lived to serve as one of her priestesses in thanks for her new body that she loved very much.

And speaking of her body, Sakura looked down at it and admired it like she always did, as it was a work of perfection. According to Iris, her breasts were massive and rond filling up most of her torso, but unlike normal breasts, the did not possess nipples; instead, the front of her breasts were mouths that could open up to suck and lick any cock that came near them.

And the favorite pair of cocks they liked to blow and suck on were on, of course. As rising from her crotch were a pair of twin horse cocks, that were currently being suckled on by Sakura's breasts.

It was a wonderful feeling.

That was, of course, not the only Lady Iris had changed about her; she also had the legs of a goat covered in blue fur, which matched the skin color she now possessed. And from her head also grew a great set of Ram horns.

And with that act of narcissism over with, Sakura left her bed and her bedroom, her pregnant belly jiggling as she walked.

She couldn't wait to give birth to her sister's baby; that was another thing she had to thank Lady Iris for. She had brought Rin and her back together as sisters, and they had celebrated by knocking each other up.

"Morning Rider," Sakura greeted her summoned Servant as she entered the living room.

"Morning to you too, Master," Rider said as the lamia went to get rid of her morning wood by thrusting her large snake cocks into her brother's pussy and ass.

The rat girl that was Shinji Matou moaned in happiness as her many breasts leaked milk onto the floor; it was such a waste in Sakura's opinion, but what could one do?

As for why her Servant was a lamia? Well, that was once again thanks to Lady Iris' meddling as due to her having meddled with the Greater Grail, the Servants that were summoned by it were fully infected by her lady's Miasma, which resulted in them instantly transforming as their spiritual core was corrupted from the get-go.

This was why her Servant, the great Medusa, was now futanari lamia, who loved to put Shinji in her place.

And once again, like so many days before, there was not the sound of a single insect near their home.

Like most days, it was a good day, and soon, it would be a better day as her Goddess was about to fulfill her plan.

Xxx

Bazett Fraga McRemitz moaned like a whore as her pussy was filled with cock, and not just any kind of cock, it was a thick and veiny canine cock whose knot was smacking against her pussy lips, being too big to enter her relatively small pussy, but that was quickly going to change.

As with every thrust and smacking against her pussy Bazett felt and saw her body change before her very eyes; she had grown eight additional fat tits along her torso, fur was spreading across said torso, a tail had sprouted from her tailbone, and her feet had turned into paws, and she could feel the pleasurable change of her face elongating into a muzzle.

And soon enough, her pussy would change into a triangular canine pussy that would easily take the knot of the cock that was trying to impregnate her.

And as for that cock was attached to? Well, it was none other than Cu Chulainn as Bazett had intended to summon her favorite hero for the Holy Grail War, but then she had done so; not even five seconds later, she had seen him transform into the bestial wolf hermaphrodite that was not fucking her silly as she had seen eight tits explode from his torso as his dick transformed into the canine one that was trying to knock her up.

And she wanted it.

Bazett wanted it so badly, to carry her hero's babies, and she wanted to do the same to him; she came once again, and the tiny cock that was growing from her crotch got even bigger.

And then the not slipped inside Bazett as her pussy had finished fully transforming, and so for the next half hour, Cu's canine cock pumped Bazett's womb full of fertile cum as her transformation finished.

And so the two mated with each other, producing many children in their little corner of Fuyuki even as the world changed.

Xxx

Illyasviel von Einzbern knew something was wrong with Fuyuki the second she had passed through the city's borders, like the entire place had been cut off from the rest of the world, and no one seemed to be vise to that fact; it was only her status as a Homonculus that allowed her to notice as she was connected to the world itself.

That bad feeling was confirmed when out of nowhere, Berserker grabbed her body and impaled her on his dick.

Illya had little chance to react or even command him to stop with a Command Seal as the giant of a Servant started moving her small body up and down his gigantic shaft.

Illya moaned as her mind and body were broken in by the sexually charged Berserker as the bomb that had been planted in him from the second he had been summoned had finally gone off the second his body had come into contact with Iris' Miasma that hung in the air permeated all of Fuyuki as the place was now a haven of degeneracy as everyone had now become mutated by and turned into people who only cared about one and that was pleasure.

Illya moaned as Berseker pumped his tainted seed into her womb, which reacted well to the Miasma. Her body was now drawing into itself as she tried to communicate with the world, but she only got one answer.

And that was.

"Enjoy yourself, Illya; you and Shirou can have some fun later when you have reached maximum capacity."

She didn't know what that meant, but as Illya's loli body was fucked by her Berserker, it started to change, started to grow and grow it did as Illya's body grew in size until she surpassed her precious Berserker in terms of height, but he grew with her, and they didn't stop until both of them were over ten meters tall, making them into a Giant and Giantess pair as Herakles' cum flooded their castle area, turning Illya's to maids as well who quickly joined their mistress in size, and eventually took her place on Berserker's cock as to let her get some rest and also birth the children that his constant orgasms into her womb had planted into her fertile homunculus womb.

Xxx

"I now declare you husband and wife, sword and sheath!" Iris declared as before her Shirou and Saber consummated their marriage, her beloved hero had managed to summon Saber thanks to Avalon in her body.

This had allowed her to test if her modifications to the Greater Grail had worked, and it had as while, thanks to her instincts, Arturia Pendragon had sensed the transformation coming, she could do nothing to stop it. Soon enough, she was transformed into an anthropomorphic dragon woman who had quickly fallen to her lust, but thankfully, Shirou, being the kind person that she was, had decided to show her how to handle the pleasure, which was why they were all currently here.

In the church, watching them getting married, with Kirei pussy fucking Gilgamesh to give a proper sermon, it had fallen on Iris's paws to do it.

And so thought she was very qualified to do the ceremony as she was a God and all that Jazz.

But most importantly, they also here as it was here that Iris was going to use her greatest authority.

Movement of the Earth.

She was going to move the entirety of her Fuyuki to an entirely different world without that pesky Counter Force that was trying to kill them as it had actually labeled them, more important, her as a threat to humanity.

It was not fun.

That was why she had created that barrier to stop that from being a problem. Again, now that all the Servants were summoned, the Gate to the Root was fully open. Now, they were going to use that Gate to Travel to a tree of time with rules more favorable towards her and her people.

"So, is it time?" Shirou asked as she pulled her dragon cock out of Saber's very pregnant pussy.

"Yes, the great exodus shall now begin."

And with that, Iris began to chant as the magical circle that covered the entirety of Fuyuki lit up and with the final words spoke.

"Praise be to me."

And like that, the entire city of Fuyuki disappeared from the face of the Earth and appeared on another.

But Iris could tell they were no longer on another ear.

"Did you do it?" Shirou asked.

"Yeah, I did it; we are now in a world where we can be us and do whatever we desire, so now everyone let go!" Iris said, and immediately, everyone who was remotely pregnant in the entire city of Fuyuki had their pregnancies accelerated to term, and they all gave birth at once.

New life born ready to conquer this world.

All with Shirou leading the charge as she was now a hero, Iris.

And Iris wanted her to do a whole lot of things.

Xxx

A/N: Story done this has been years coming and it was always mean to be a short one.

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