Nobody knew what happened between the sunset and the sunrise, but by the time morning came upon Ponyville the city was different. Everyone woke up with a strange burning lust that they couldn't possibly contain and it didn't take long before the entire city filled with the noises of sex.

It wasn't only heat that afflicted the ponies. Heat was doable; they could have just ignored it. This was heat on top of a mental compulsion to just go at it like rabid, lusty creatures unable to control themselves.

“Aww yeah, buck me,” Applejack moaned in her deep drawl as she dug her hooves into the ground to help keep herself on even footing. Behind her, her well hung brother Big Macintosh fucked her soaked and dripping pussy, making plenty of wet sounds as his body weight pressed down heavy onto her. His thick, long cock opened her tight cunny wide and every hard thrust shook her body. She loved every second of it.

Behind the workhorse stood the youngest of the Apple siblings; Applebloom. The blushing, blooming mare couldn't believe herself, having never even felt her first heat before that morning, but she wasn't dealing with it like any normal young mare should have, whimpering beneath the blankets as she hoofed off for the first time. No, instead she was kneeling behind her big brother and sister, watching them fuck intently as she took clumsy, long licks up the heavy swaying nutsack full of cum that would soon be rutted right into her idolized sister. Of course even as she sucked on his balls she still hoofed off, unable to quell the burning in her pussy.

All the repressed tension of working the farm all day and never getting dates due to his schedule left Big Mac with a lot of frustration. Every last ounce of that frustration he put to work in rutting his beautiful sister silly. She was so tight, hot, and just dripping mare juice down onto the floor as he fucked her. He was strong, but his sister was too, and if anyone could take him at his most intense it was her.

They had gotten up early to work in the fields, Apple Bloom along to study them so she could one day help, but a strange rush of soft pink pollen washed over them as they worked and they couldn't contain themselves. None of them were too certain what it was or if anything was seriously wrong but they soon enough weren't thinking about that all, lost to the intensity of their lust.

Secretly, both siblings were glad for it. Applejack and Big Mac harboured deep, long-time crushes on each other that neither wanted to admit, but it gave them the convenient excuse they needed to just go for it, as they always wanted to do.

“I'm cummin'!” Applejack yelled out, pushing back harder against him, needing his cock buried as deep as possible inside of her. “Fill me up with yer cum, Big Mac!”

The stallion didn't need to be told twice. He grunted, pushing into the spasming, tightening pussy as she gushed her mare juice down onto the floor, and filled her up with his incredibly potent seed. Applebloom's tongue on his balls certainly helped, and they tightened against her mouth as he emptied himself inside of his sister.

They quickly detached, rolling onto their backs and lying together, moving in for a lazy, slow kiss. It was apparent to both of them how mutual their risque feeling were, but they'd found their excuse, and ran for it. “Applebloom, why don't you be a dear and come lick my cooter clean?” the blonde pony drawled, looking at her left-out little sister, whose face lighted up at the thought of sucking the cum out of her sister. She went right to work.

These sorts of scenes exploded all over Ponyville, many of them very public as people tried to go about their days only to be consumed by lust. Public sex never happened in the tranquil little town, but it was impossible to avoid, and everyone just tried to ignore it in a mix of shamefulness and hidden desperation to let it all out. So much debauchery that the citizens denied themselves for their whole lives just spiralled out of control as all social order broke down in a blaze of lusty glory.

In the middle of the streets, Pinkie Pie was the gleeful victim of a vicious penetration, loving that her body was being used to please so many stallions at once. Mr. Cake stood in front of her, slamming down her throat with a steady noise of her gagging on his flared cock, loving the sound she made. Two more men whose names she didn't even know fucked her ass and pussy in tandem and the streams of white across her flank said they weren't the first ones to have been there.

When one of them withdrew, she pushed on her friend's hips, and his long shaft slid slowly out of her mouth, smacking her in the face as she announced very loudly, “Who wants some pink party pony pussy?” with the same excitement she gave anything else, before pushing forward and choking on the married stallion's shaft all over again.

The spa was another scene of mayhem. Jacuzzis and massage tables made excellent locations for desperate casual sex, but the biggest scene was right in the entrance. Rarity stood up on her hind legs propped up against the desk as the two spa ponies Aloe and Lotus sat on either side of her, eating out the white unicorn's ass and pussy in tandem.

“Oh darlings, why did I never know about this massage technique? It's simply exquisite!” The two sisters didn't talk, the only physical contact they even made being the mutual hoofing off of the other, but their tongues slithered inside of her pussy and rectum with a very regular steady rhythm, whether sibling telepathy or just a lot of practice, Rarity didn't care.

Panic mode set in at the library, where Twilight had locked everything shut to keep people out, and just her and Spike sat in the middle of the room. Of course, she could do nothing to resist her own fires, let alone his much less principled ones. She bent over her table and let her dear dragon assistant fuck her, moaning as she tried to keep her mind off the great sex and on figuring out what happened.

“What do you think is doing this, Twilight?” he asked, his draconic shaft proportionately a little big on his body, but buried into the pink princess, there were few complaints. She was virginally tight, incredibly soft, and so focused on her task that he could do anything he wanted to her, even fondling her flank and tugging on her tail.

The alicorn's heat was more potent than most, a biological need to reproduce that far exceeded any other variety of pony, but Twilight Sparkle was a principled and skilled student who knew all the focus and breathing exercises in the book. Even as Spike ravaged her and she felt her orgasm impending, she poured through book after book in an attempt to try and explain the chaos outside. “I don't know yet, but I'm working o--oh, gosh! Spike, I-I can't keep it going any longer. I'm going to--!” She didn't even finish her sentence before her dripping pussy exploded, gushing onto the floor as Spike's hot cum pumped inside of her, filling her with both physical and emotional warmth. Her eyes lidded and she slumped down, forgetting all about the books as she rode out the pleasure.

She knew that she needed to get back to work, but instead she found herself biting her lip and pulling her hips away from Spike's shaft, only to rub her flank against it and grind her round ass up on him. The lust claimed her mind and left her only desiring one thing; anal.

Author's Note

Despite the setup here there will be a long-term plot to this story, it will just be buried under a lot of sex. As a result if you want to request a certain pairing or scene or even just a kink you'd love to see I can certainly write it in. There'll be a lot of space for all that stuff.