At this point, the voices in your head begin to bicker, loudly. Most of them want to appeal to your greater sense of morality. There is a communist loose in Equestria, and if you don't stop her, she's going to team up with the changelings and enforce a soviet-inspired government upon every sapient species on the planet. It is times like these that make you truly question what makes you the Element of Loyalty, or perhaps Bravery. Who are you loyal to, your friends? Your country? What even is your country anymore? Perhaps the only thing that makes the most sense to you about loyalty is that you can't hold it with two conflicting interests; you have to pick a side.
A lone voice stands opposed to the rest, echoing loudly throughout your head. It speaks only two words: "Help her." You're not quite sure whether 'her' should refer to Princess Celestia or to Twilight, but your heart says Twilight. The voice begins to grow louder and louder, and eventually drowns out every other voice. You look Twilight in the eyes, and you realize where your loyalties lie. You have to help her get home.
To do this, you're going to need to convince your remaining four friends. You don't know how much time you have left before Celestia does something to try and stop you, so whatever you say, it has to be completely convincing in as few words as possible. Luckily, you know these ponies. Well, except for Coco. Okay, luckily, you have an ace in the hole - reading every possible future simultaneously to find the exact sentence that convinces your friends to want to return to Earth. You start with Daring, since she's easiest.
"Daring, you miss having a dick and eating meat. And if you stick around here, you're probably going to get arrested again because ponies don't know how to coexist socially with a pony who's antisocial. Between living alone in the woods for the rest of your life and living in a city having to pretend you don't enjoy hunting animals, wouldn't you rather come home and enjoy your hobbies with people who understand you?"
She rolls her eyes and smiles.
>"Alright alright. I think I see your point. Let's skedaddle."
"Blossom. No, Hannah. You are being worked far too hard just to stick around in Equestria, and are being denied a proper childhood in the process. You have family back at home, and I'm sure they miss you just as much as you miss them."
>"I suppose you're right. I do miss my mom and pop. Probably going to miss being able to fly though."
"Lyra. You are a cover artist, and you specialize in a genre of music that you have no access to here in Equestria. Eventually, your memory of the songs you love is going to fade, and you'll have to either compose something new yourself, or start covering pony musicians. I think your talents may be far more suited to a world designed for them."
It takes a few moments for her to process your suggestions, but eventually Lyra shrugs and joins with the rest of your friends. That leaves only one pony… and the hardest.
"Coco… I know you're old. You're scared of death, and Equestria has given you a new life, so to speak. If you return to Earth, you may only have a few years left, and if you stay here, you'll probably have several more decades. But try to think for a moment about what those decades will be like. You'll remember all of your life back on Earth, but it will be forever beyond your reach. So you'll spend decades with regrets over never being able to say goodbye to the people you love. You'll also be spending a lot of time trying to get used to a culture that is relatively alien to you. Your years of wisdom don't really work here. Everyone treats you like a child, but you're smarter than them. And when you finally reach adulthood in this body, you're going to be forever wishing you could be a child again, and complaining that you wasted your childhood years twice. On Earth, you'll at least be able to know that you've lived one life, and lived it to its fullest without regrets. And I think that's what God intended for you, right?"
A tear slowly falls from her eye. You're not quite sure if that speech worked, but a few seconds later, you can see her resolve on her face.
>"Okay, I'm ready. Let's go, before I change my mind."
Celestia looks like she's about to make her own complaint, but it's too late. You have the elements, and you're united in your will. Each of you focuses on a single thought - to go home. Combined with the magic of the elements, that thought turns to power. A blinding flash of light fills the room, and a bright white portal opens up. <<<"What do you think you're doing?"
"We're blowing this popstand, Princess. Smell you later."
Before she can do anything to stop you, the six of you rush through the portal as fast as your tiny filly bodies will allow. You see another bright flash of light around you, and finally, you all fall down upon what looks like some sort of small park near the intersection of a few roads. The lack of cartoonish color around you suggests that you're clearly not in Equestria anymore. The sight of a Kansas state flag on a pole beneath an American flag, and standing atop a monument stating that you are at the geographic center of the continental United States suggests the previous statement is a bit ironic. However, a couple of unfortunate properties of this turn of events seems to spoil your recent success. Firstly, you and your friends are still ponies. And secondly, not only has the portal behind you disappeared, but the elements seem to have not survived the transfer. They gemstones in each of the necklaces and Twilight's crown all shatter simultaneously as soon as you step hoof on Terra Firma.