The last thing Equestria saw was a bright white light enveloping all the lands. Everyone had thought that it was surely the end.
The moment didn't last very long as they soon came to realize that they didn't die. Rather, they were in a new world.
To make a long story short, they had eventually come to the conclusion that whatever sent them here had likely sent everypony in Equestria, too. Now, the six of them needed shelter, and fast. This was how they quickly began to realize how vastly different this world was from theirs.
First things first, the only other signs of intelligent life weren’t ponies. They were called “humans.” They walk on two legs, don’t have a coat or mane or tail, and, in Rainbow Dash’s expert opinion, “looked kind of lame!” Additionally, a near death incident with hurling tons of steel and metal on an open street made them quickly learn that this world wasn’t exactly pony friendly.
Before long, the day was quickly turning to night, and they still had nowhere to go. So, the Mane Six decided to just BARGE into a random person’s house (likely assuming it was abandoned) and all made themselves comfy, completely unknowing to the fact that it was owned by you.
Thus, that is how you came to take care of these six little ponies, and later two Alicorns known as Princess Celestia and Luna, who somehow located the others with maaaagiccccc...
A week or so have passed since then.
Today was a day not too different from any other. The ponies were all quite cartoonish and energetic in their own right, and it was driving you crazy as you sucked and wove through a whirlwind in your own house.
“Ooooh spinny dials! Looks like an oven…but different from our ovens!” Pinkie Pie giggled as she set a hoof on your oven, trying to figure out the mechanics of it, and nearly setting your house on fire as you just managed to stop her in the nick of time. Meanwhile, over at the dining table…
“NO, YOU’RE SUPPOSED TO SAY “UNO” BEFORE YA WIN! AND YA CAN’T STACK YER DRAW CARDS, THAT’S NOT ON THE OFFICIAL RULEBOOK!” Applejack was in a heated game of Uno with Rainbow Dash. Neither seem to be taking it well.
“Pssh, rules DROOL! I’ve only been here for a few days and I already learnt the best and most awesome way to play Uno! Besides, who’s gonna remember to say that silly line over and over each game? I’m too focused on making my awesome plays!”
"You oughta treat this game with more RESPECT!" Applejack yelled.
Applejack chomps down on the Uno box and throws it at Rainbow Dash, who takes this as an act of hostility and engages in an Uno card duel with the other Earth Pony.
Meanwhile, near the front door, a shrill shriek rang out. Rarity’s voice. “OH MY CELESTIA!!!” You quickly ran over to see what was happening!
…Rarity was hunched on her hooves and inspecting your choice of footwear. “LOOK at this HIDEOUS display of fashion! I’d have the person wearing this put on trial for this! These colors, so GLARING! And there’s so many tears! I’d have thrown them away by the first FADING COLOR!!” With that, Rarity uses her unicorn magic and tosses some of your shoes out the window. “Away! Do away with them!”
But, no time for that either, since Fluttershy was walking through the door and letting in various pests and animals like squirrels, racoons, and more.
Upon noticing you, she shyly puts a hoof behind her mane. “Well, I can’t stand to see them eat trash, so I wanted them to have a proper meal before sending them out…”
Back in the kitchen was Princess Celestia and Luna, the former eyeing a storebought cake with just barely restrained hesitation. It seemed unbecoming of royalty such as herself. "Do you think the human would notice if I had a slice or two?"
"Sister, please," Luna sighed, "you know how you can get with cake. Once you get one slice, you just can't stop yourself until the cake is gone."
And in the midst of it all was Twilight Sparkle, sitting before your TV as though hypnotized as she flipped through channels with her hoof. "What...is this?" She asked, looking back at you. "I've never seen anything like it!"