Possible Titles: The day everyone became human, Its Now a Human World, Becoming Human, The day the world became human.
Tags: Slice of Life (The story is mainly about the people try to continue living their life before the change in their human form and showing how the change effects their society), human (Because everyone is now a human that have no horns or tails with normal human hands and feet), alternate universe (story take place in a alternative universe of MLP: FIM), mature (due to everyone still walking around and living completely in the nude like their original counterparts in the show and some sex scenes), sex (due to some sex scenes).
Concept: Twilight accidentally cast a spell that forever change the entire world of MLP. Twilight have turn every sapient race/species into human. But despite their new form they still continue living the way they was living as they adapt to their new form and showing how it effects their society.
Rating: Mature (for sex scenes, and for suggestive/lewd situations, casual junk and boobs fondling/handling, some mild junk abuse, casual floppy cocks and balls, casual bouncing boobs, casual nudity, casual but suggestive positions/situations like dicks casually touching each other or the Princesses sitting in a suggestive manner due to them not being used to their form)
Notes/Details:
1. Even though everyone is human they still have their passive and natural abilities and characteristics of their original race. Like the Changelings can still take the forms of others but can't the form of any non-human species. While the dragons are now humans they can still breath fire and bathe in lava despite no longer having scales but they can still grow to huge Dragon sizes (just picture The Dragon Lord Torch and that adult Red Dragon from the episode Dragonshy in human form but are still dragon size and I see Torch's huge floppy human junk being the size of a small town and him accidentally destroying buildings with his new huge human junk while visiting Princess Celestia) and live for a long time. The Abyssinians still have their cat reflex and agility. The Earth Ponies still have their strength and ability to grow stuff (and Pinkie Pie still have her ability to do cartoonish things like pulling stuff from out of nowhere or out of her hair that includes her pubes that she later discovers) and even though the Pegasus Ponies no longer have their wings or the ability to fly but they're still are very athletic and super fast and they still have the ability to walk on and interact with clouds and somewhat manipulate the weather. And the Unicorns no longer have their horns and can't do any magic (beside teleporting themselves or others with them) and the Alicorns are pretty the same as the Unicorns except they're still taller then most people and they can still move the sun and the moon and they can move objects with their magic.
2. Like in their original form everyone still goes around completely naked.
3. Each chapter can be about a certain character getting used to their new form and how does it effects them. Each chapter showing how each race is dealing with the sudden change. Mostly background characters like one is about Garble the teenage dragon with his teenage dragon flunkies/buddies as they try go about their day in their human form and as they goes about their day they will discovers things about their new human form (like them discovering how sensitive their new soft floppy human cock and balls are) like while during their normal dragon roughhousing like wrestling Garble discovers how sensitive his new soft floppy human junk is as it take hits as they roughhouse. But Garble would fight through the pain to avoid showing any sign of pain to other dragons to look tough even going far that when a dragon question him when Garble took a hit to the junk he would act tough to convince the others that he is absolutely fine and to proof it that he have the other dragons kick or punch him repeatedly in the junk. And as he is getting hit in the junk proofing that his junk is durable as ever and through his pain Garble convince the others that if they feel any pain when their junk take a hit then they are not a real dragon which cause the other dragons tough and pretend that are not in pain when their junk take hits and this convince all the other male dragons in the Dragonlands to do the same (even going far as inventing a new dragon game that involves them kicking and punching each other in the junk in showing how strong their dragonhood is which becomes a new dragon tradition and a part of their culture) and despite them not being fond of their form but the male dragons do finds the female dragons' new human form strangely attractive (especially the bouncing orbs on their chest and their butt for some reason). The Dragons eventually discovers how to good it is when pleasuring themselves and having sex. And one chapter could be about Trixie and how it effects her not being able to magic or a chapter about a Changeling and him or her hive is being effected by the sudden change and similar to the Dragons the Changelings discovers how good it feels when touching certain part of their new form.
4. The story could begin after Twilight accidentally transform everyone on the planet into a human with Twilight describing everyone shock and reaction of it in the introduction chapter. Maybe like she is writing it down in some kind of journal or something.
5. After the introduction chapter the next chapter could be about the Princesses summoning all the leaders of the other kingdoms (King Aspen the king of the deers, Queen Novo, the Abyssinian King and Queen of the cat people, King Thorax, Dragonlord Ember, and Prince Rutherford the ruler of the Yaks, a Minotaur king and queen) for a meeting for them explain how their people are reacting/responding to the sudden change and to discuss on how they should deal with this worldwide crisis. With the leaders all showing up as humans and with them not being used to their new human form like them moving and walking awkwardly (due to something like guys trying to used to their floppy cock and balls and the females bouncing boobs) and as they sit awkwardly in their seats (like sitting bow-legged) that is made for original forms.
6. All the females find having two huge bouncing orb of flesh on their chest (boobs) as something strange and find it annoying the way they bounce with their movement but they do like how they feel when they are squeeze and fondle. And the males find their new floppy cock and balls and the way it constantly hang and flop around freely with their movement (remember they're not wearing anything so nothing is hiding their junk) strange to how different they are to their original cock and balls and find them to be a lot more sensitive too but they find how good it feels when they're pleasuring themselves and how good it feels while having sex.
7. And pretty much the rest of story is about how the world's inhabitants continue living their life before the accident as they adapt living their new form.
This story idea was inspired by:
The ending of the Angry Beavers episode I am Not an Animal I'm Scientist Number One where all the animals turn into humans.
That I have for this story idea. And if anyone want to know more on this story idea just ask.

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and even though the Pegasus Ponies no longer have their wings or the ability to fly but they're still are very athletic and super fast and they still have the ability to walk on and interact with clouds and somewhat manipulate the weather

How ?

Unicorns no longer have their horns and can't do any magic (beside teleporting themselves or others with them)

How about.. they can mostly only use one spell ?

a chapter about a Changeling and him or her hive is being effected by the sudden change and similar to the Dragons the Changelings discovers how good it feels when touching certain part of their new form.

Can Changeling change gender ?
and when they change, they don't have the green flams, but... like the Skrull

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Also

The mare's reaction to have there boobs/breasts over there heart and not between there belly-bottom & ... pussy

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1Q. Even though the Pegasus don't have their wings or their ability to fly they still have their passive magic that allow them to be super quick and agile. Like Rainbow Dash still being able to do the Sonic Rainboom by running or Rarity using her magic to find gem. And they can still touch clouds as a solid object. And for them still being able to manipulate the weather they somewhat still do it like in the show but due to them not being able to fly they now need to use some kind of flying contraption something like here that allows them to fly up to the clouds and get to and fro from Cloudsdale.

Q2. Pretty much. But they can still make healing potions like Zecora. And they can still shoot magic blast but from their hands and can channel their magic to open magic locks.

Q3. For me they can't change gender they can only take the forms of anyone of the same gender (but you can change that if you want). And they still have the green flames when they transform.
Note:
I forgot to mention that the ponies as humans can still have and can get Cutie Marks that appears on their hips.

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Q1: So they have to use Pinkie Pie's ... season 1 episode 5 Griffon the Brush-off !?

Q2: and each know one extra spell, bast on there C.M., that mostly is different for each of them

Q3: Spicking of which...
Do the Ponies still have there colors ?, or are they... all human color skin, but with colorful hair ? or is that alose normal human color
https://www.deviantart.com/kianamai/gallery/47529725/Humanizations

Q4: What do you think of this ?
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What does Lyra think of this ?

What about EQ.G. ?

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Sorry for taking so long to reply.

Q1: So they have to use Pinkie Pie's ... season 1 episode 5 Griffon the Brush-off !?

They mostly stuck with finding non-magic methods of getting around in the air.

Q2: and each know one extra spell, bast on there C.M., that mostly is different for each of them?

Anything similar to a Unicorn and Alicorn have the ability to shoot magic beams from their hands and are able to teleport and move objects with their magic while anything else just have their natural passive magic abilities. And the ponies still have their Cutie Marks and the talents that come with them.

Q3: Spicking of which...
Do the Ponies still have there colors?, or are they... all human color skin, but with colorful hair ? or is that alose normal human color?

They all have normal human skin color but they still have their original hair color (the color of their pubes are the same color of their color. Like Princess Celestia and Luna still have their ethereal hair but they also have ethereal pubic hair too).

The mare's reaction to have there boobs/breasts over there heart and not between there belly-bottom & ... pussy

They would find something like having boobs on their chest instead on her crotch as weird and strange.

What does Lyra think of this?

I would imagine Lyra having the ball of her after discovering the wonders and joy of hands and when she finally learn to walk on two legs. But Bon-bon on the other hand would finds the whole thing weird and unnatural.

What about EQ.G.?

If you're talking about Equestria Girls any events of Equestria Girls doesn't exist in this alternative universe.

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Q1: They mostly stuck with finding non-magic methods of getting around in the air.

Like what else ?

Q2: Anything similar to a Unicorn and Alicorn have the ability to shoot magic beams from their hands and are able to teleport and move objects with their magic while anything else just have their natural passive magic abilities. And the ponies still have their Cutie Marks and the talents that come with them.

Wait, all the unicorns can teleport ?

Q3: They all have normal human skin color but they still have their original hair color (the color of their pubes are the same color of their color. Like Princess Celestia and Luna still have their ethereal hair but they also have ethereal pubic hair too).

What are they going to say about there skin ?

They would find something like having boobs on their chest instead on her crotch as weird and strange.

Ya, and what about the size ?

If you're talking about Equestria Girls any events of Equestria Girls doesn't exist in this alternative universe.

K

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Like what else?

They would have to get creative on finding non-magic solutions for many things.

Wait, all the unicorns can teleport?

In the show all unicorns and Alicorns have the potential to teleport but some must learn to teleport.

What are they going to say about there skin?

I can see the ponies (and dragons) finding their limited skin color and tones kinda off putting but they eventually get used to it.

Ya, and what about the size?

If you're talking their actual size they are regular human size while Alicorns like Princess Celestia and Luna are taller like amazons. The Minotaurs and the Yaks are huge but not as tall as Princess Celestia and Luna. Teenage Dragons are regular human size but can still grow to gigantic dragon size like Dragon Lord Torch as they get older (Spike's human form is teenage). And if you're talking about the size of their privates they have somewhat huge and firm bouncy boobs while female beings with powerful magic like the princesses have huge and firm bouncy boobs (the more powerful the female individual's magic are the bigger their boobs will be. So picture Twilight if she have the magic power of Celestia, Luna and Cadence her boobs would be the size of the Canterlot Castle) and the males have would a human cock and balls that are a little bigger then a regular human cock and balls while the dragons' cock and balls are a lot bigger with balls being big that they somewhat can't completely close their legs because of them (Spike's cock and balls aren't that big they are still big compare to ponies). And the male Minotaurs' and Yaks' cock and balls size are in the middle of ponies and dragons.
I'm curious about why you are asking these questions. Are you planning to write this story idea?

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I'm curious about why you are asking these questions. Are you planning to write this story idea?

Nope

So picture Twilight if she have the magic power of Celestia, Luna and Cadence her boobs would be the size of the Canterlot Castle)

https://www.deviantart.com/comments/1/394810910/3613466325

I can see the ponies (and dragons) finding their limited skin color and tones kinda off putting but they eventually get used to it.

I meant, somre are gong to be white, other's black...

In the show all unicorns and Alicorns have the potential to teleport but some must learn to teleport.

I like to think that only the princess and StarLight can teleport