At Crystal Prep Academy... 

We see Human Twilight trying not to bring any attention to herself as she is moving past students. 

Human Twilight: Sorry, excuse me. 

SHe keeps this up as she walks towards a laboratory with a rack of test tubes, a computer with a monitor displacing a picture of her dog, which is this world's counterpart of Spike. The little puppy is napping on a swivel chair, and he barks and gets all excited upon seeing his master! 

Twilight: SPIKE! 

He runs to her and licks her face. 

Human Twilight: OKya. Okay! 

She laughs and pets him on the head. 

Human Twilight: Last night's field test confirmed it, Spike. 

She brings out her device. 

Human Twilight: With this device, I can track and contain the bizarre energy coming from Canterlot High! I know you didn't like me going over there, but I just couldn't wait. And soon I'll have all the time I need. (She picks up some pages from a stack.) All of Crystal Prep is gonna be there for the Friendship Games. I just hope all that rivalry nonsense doesn't get in the way of my research.

Dog Spike was playing around with a ladybug that flew past him. 

Human Twilight: If I can collect enough data on these EM frequencies, I should be able to extrapolate the waveforms to determine their origin! That would practically guarantee my entrance into the Everton Independent Study Program! 

She gets to excited that she falls off her chair. 

???: Twilight, you know the rules against pets. 

In front of Twilight is the Dean of the school. 

Cadence (The Dean of Crystal Prep Academy! She acts as a big sister to Twilight!) 

Human Twilight: Well, Spike isn't a pet, Dean Cadence. He's the focus of my research project. Human/canine cohabitation effects and implications. 

Cadence: If you say so. But Principal Cinch is highly allergic, so I guess you put on a clean shirt. 

Human Twilight: Why is that? 

Cadence: Because she wants to see you. 

Human Twilight: Ooh! Maybe she has news about my application to Everton!

Cadence: I've been meaning to talk to you about that. Are you sure that's what you really want?

Human Twilight: Why wouldn't it be? A program that allows me to focus all my attention on my own advanced math and science projects? What a dream come true!

Cadence: But there aren't any classrooms with other students. You'll be doing everything on your own. 

Human Twilight: That is why it's called an independent study program.

Cadence: I just don't want you to miss out on anything, that's all. Being around other people isn't bad. Sometimes it's how you learn the most about yourself. 

Human Twilight: I guess so. 

She then takes off. 

And so... 

Human Twilight walked into the office of one Principal Abacus Cinch. 

Principal Abacus Cinch (Head of Crystal Prep Academy! She is a very strict and controlling woman who will do anything to keep her school's reputation strong!) 

Human Twilight: You wanted to see me? 

Cinch: Yes, on the Friendship Games. 

Human Twilight: What does that have to do with me? 

Cinch: Listen Twilight, it doesn't matter whether or not we win or lose. The important thing is that we are expected to win. Because we have a reputation. 

She revealed a bunch of trophies. 

Cinch: And it is that reputation that is responsible for everything we have here. For everything you've done here. And you've done quite a lot, haven't you? 

Human Twilight: I don't know. I guess. 

Cinch: Oh don't be so modest. You're the best student of our entire school. What I can't understand is why you don't want to compete. 

Human Twilight: In the Friendship Games? 

Cinch: It seems that Canterlot High is undergoing a renaissance. Test scores raising, grades, even athletics. You see, they are developing somewhat of a reputation. That cannot happen! 

Human Tiwlight: Principal Cinch, I can't possibly participate in the Games! My work here is very—

Cinch: Right, Cadence, could you find my contact sheet for the Everton Independing Study Program? 

Cadence: (scared) O-Of course ... 

She left with hesitation. 

Cinch: I understand you have applied. 

She brings out a file from a drawer and puts on a smug face. 

Cinch: You see, one of the advantages of having a reputation is a certain amount of influence in such things. So, let me offer you a deal. In return for contributing your agile mind to these Games. I will use my influence to guarantee your application is approved. Though, I suppose I could also have it ... denied. 

Human Twilight was taken aback by this. 

Cinch: (smirking) What do you think I should do? 

Later... 

Human Twilight is packing up things for the Friendship Games. 

Human Twilight:  Come on, Spike! I was always gonna go to Canterlot High for the Friendship Games! But now I have to compete. Besides, it's not like she gave me a choice. 

Dog Spike whimpered as his master scratched under his chin. 

Human Twilight: I know Spike, I don't like it either. I probably won't be able to collect anywhere near as much data as I thought. 

She begins to stand in the line to the school bus, and there are five figures there. 

The Shadowbolts (The Best of the best of Crystal Prep! Sugarcoat, Sunny Flare, Sour Sweet, Lemon Zest, and Indigo Zap!) 

Indigo: So, are we going to win? 

Human Twilight: I don't know. 

Indigo: (imitating a buzzer) Wrong answer! Try again! 

Human Twilight: Um...I guess? I-It's just...I mean, I heard that CHS is doing well now, with their reputation, and, I mean...it's not better than ours, of course. But we can't let them do it, you know? Win, I mean? Right?

Sugarcoat: That was a really bad speech. You should consider not speaking in public.

They all walk into the bus with Human Twilight taking her seat. 

Back at Canterlot High... 

Rainbow: I hope the Friendship Games have a music competition, because we would totally rock it!

Jack: NO! 

Rainbow: But- 

Jack: You heard what VP Luna said Rainbow Dash, we can't use magic whatsoever. 

(Y/N): Agreed, that's not fair. 

Rarity: Easier said than done, Darling. I'm sure in Equestria, magic does whatever you want, but- 

Twilight: But this isn't Equestria. 

Applejack: Well, I'm sure the two of you will figure something out. 

Sunset: That is if we can. 

(Y/N): Oh come on, you two are some of the smartest girls I know! You can figure something out! 

Rarity: And while Twilight and Sunset work on keeping the magic out of the Games, I have been working on what to put in! 

Applejack: Now what did you do Rarity? 

Jack: Write a love confession to you. 

Applejack and Rarity both blushed at that. 

Applejack and Rarity: WE'RE NOT A COUPLE! 

(Y/N): (smirking) You both keep denying it, you can't escape from it. 

Rarity: Well, anyway ... uh ... Hahahaha. I had a little time on my hands, and since we dont' know what the Friendship Games events are- 

Rarity brings out a bunch of blue/white/yellow jersey and shorts combos. 

Rarity: I made a few options for uniforms! 

Rainbow: You really ddn't have to do that. 

Rarity: I know! 

Applejack: No, you really didn't have to. 

Rarity: I KNOW! 

Then the Crystal Prep Busses arrived as Celestia and Luna meet with Cinch. 

Celestia: My sister can help your students get settled, if you'd like me to show you around, Principal Cinch. There have been quite a few changes since your last visit. 

Cinch: (adjusting her glasses) Oh yes, Celestia, I'm sure that would be fascinating. 

Luna then huged Cadence. 

Luna: It's always a pleasure to see you Cadence! 

Cadence: Thank you, Luna!

Human Twilight poked her head out as she was a bit dizzy due to Lemon Zest putting her headphones on her! 

Indigo: Coming through! 

Indigo rushed out, and Human Twilight began to lose her balance, bumping into Sunny Flare! 

Sunny: Seriously?! 

Human Twilight: S-Sorry! I didn't mean it! 

Sour: (Fake sweet tone) Aww, you're such a sweetie! (viciously) I'm watching you! 

Human Twilight: Right ... sorry. 

Sugarcoat: Pbth, doormat much. 

All of the students then noticed Human Twilight. 

Adagio: What in the? 

Sonata: Twilight has a twin sister? 

Aria: Dumbass! That's her other self! 

Sonata: Oh ... I knew that! 

Aria: YOU DID NOT! 

There was a mix of different reactions. 

Such as- 

Rocker: T-Twilight?! 

Eco-Kid: That girl looks so much like Twilight! 

Drama Kid: What's going on here?! 

And as for you guys... 

Jack: Holy- 

(Y/N): CRAP! 

Rainbooms: TWILIGHT?! 

Twilight: Uh .... 

Twilight was in shock at seeing her other self, as they began to copy each other. 

Like this: 

https://youtu.be/P7D6iFqkbr4

Human Twilight: No wonder, everyone recognizes me. 

Jack: Well ... this got awkward. 

Fluttershy: Uh ... she's wearing a uniform that looks like-

Rainbow: I knew it, Crystal Prep. 

(Y/N): Wait, if this is the other Twilight, then shouldn't there be another- 

Dog Spike popped out and Spike had his mouth agape. 

Spike: ME?! 

Jack: Of course. 

Then Celestia saw the whole scene. 

Celestia: TWILIGHT?! 

Twilight and Human Twilight: Yes? NO! I MEAN- I was- 

Human Twilight: THIS IS GETTING RIDICULOUS! 

Twilight: Was I always this socially awkward? 

Cinch: I must apologize for the curiosity of my prized student. The smart ones are always curious. I'll return her to check in with the rest of the classmates. 

All of you stared in shock at what was that. 

Celestia: Twilight, you never said you had a twin sister. 

Twilight: I don't- 

Pinkie: That Twilight is obviously the Twilight from this world, since it couldn't possibly be the Twilight from the pony world, since the Twilight from the pony world doesn't go to Crystal Prep or wear glasses!

Celestia: Right. 

She then left. 

Rarity: I can't believe our world's Twilight goes to Crystal Prep! 

Rainbow: So, that Twilight's going to play against us while our Twilight is here playing with us? ARGH! This whole thing is hurting my brain! 

Sunset really was losing it too. 

Sunset: OH GREAT! JUST FUCKING GREAT! I MEAN IT'S NOT LIKE WE DON'T EVEN KNOW WHAT THE HELL HAPPENS WITH THE MAGIC HERE? AND NOW WE GOT TWO TWILIGHTS?! UNBELIEVEABLE!! UN-FUCKING-BELIEVEABLE! THIS IS FUCKING STUPID AS SHIT! 

(Y/N): WHOA! Sunset, calm down! 

You all were just shocked at her outburst. 

Sunset: S-Sorry. I'm just under a lot of stress right now. 

Twilight patted her best friend on the back. 

Twilight: Hey, it's okay Sunset, we're all just as shocked and confused as you are. 

(Y/N): Yeah, we can figure things out as they go along. 

Jack: Besides, we all sorted things out during the Battle of the Bands. 

Sunset: I know, but it's just, even with Twilight here, we've reached a roadblock. 

Twilight: Hmm ... Sunset, come with me. I have an idea. 

The two went to the statue as they went to go and retrieve a book somewhere in her castle, only to be slammed into the mirror. 

Sunset: What the?! Where's the portal? 

Twilight: (shaking it off) I ... don't know. How did- 

Later... 

(Y/N): YOU MEAN TO TELL ME THE PORTAL STOPPED WORKING?! 

Sunset: Yes, it's closed! It's not there anymore. 

Jack: How can it just disappear like that? 

Twilight: I don't know, it's probably because of the other me. 

Human Twilight was nearby completely absorbed in her detector's readings. 

Applejack: Just what in tarnation is she up to?

(Y/N): Don't worry, I got this. 

You walked up to her. 

(Y/N): Uh ... hi Twilight. 

Human Twilight: (blushing) H-Hi. 

(Y/N): What are you doing there? 

Human Twilight: Oh ... I was ... just- 

Indigo: Who wants to know? 

The Shadowbolts appeared. 

Jack: Hey, what's your deal? He was asking her a question. 

Indigo: It's none of your damn business. 

Applejack: Hey come on. Let's not get too competitive before the Games even start. 

Sugarcoat: It's not even a competition since we've never lost. 

Fluttershy: Hey, that's not very nice. 

Suny: Sorry Dearie, is't not about being nice. 

Rarity: Well, you might use a little tact. 

There was already an intense rivalry going on here! 

Pinkie: Hey, this is already getting a bit too tens! We need to lighten the mood! 

(Y/N) and Twilight: Pinkie, what are you- 

She was already gone. 

(Y/N): Oh no. 

Pinkie: HI! 

Human Twilight: Oh ... hi ... 

Pinkie: I'm Pinkie Pie! 

Human Twilight: I'm Twilight. 

Pinkie: I know. You look like my friend Twilight, over there. 

Human Twilight: Yeah ... I noticed. 

She looked at her device. 

Human Twilight: Hmm ... 

Pinkie: What's that? 

Human Twilight: A sort of spectrometer. I built it to track EM frequencies. But it can also contain anomalies. 

Pinkie looked confused. 

Human Twilight: It measures things. 

Pinkie: Like the party? 

Human Twilight: Yeah, though it doesn't look like much of one to me. 

Pinkie: I know. Soemthing is clearly missing! Come on! 

She dragged her over to her party cannons! 

Human Twilight: What in the world are these? 

Pinkie: Party cannons! 

Human Twilight: Um are you sure this is a good idea? 

Pinkie: Absolutely! 

She activated them, and Human Twilight dives to avoid it, only for her to see everyone having a good time! 

Then suddenly the device activates and starts to drain something from Pinkie, leaving her in a depressive state. 

Pinkie: Aww ... I'm party-pooped.