"What?" Sunset and the others asked.
"What do you mean Sunset's with Twilight?" Fluttershy asked.
"Who cares what she means? Twilight's back!" Rainbow exclaimed.
"But wait!" Sunset shouted as they all started running towards the door. "Something's not right here."
"What do you mean?" Rainbow asked.
"Could it be the obvious Sunset is with Twilight thing?" Applejack said sarcastically.
"Um...actually...I think I can explain that." Sunset said.
"What are you talking about?" Rarity asked.
"When I first came to your world, I saw a lot of people who looked like those I knew back in Equestria. A few weeks went by and I noticed they even acted the same way. I came up with a theory that there are doubles in each world. In Equestria, there's one Twilight-"
"And there's one that lives in the city!" Pinkie exclaimed.
"So by going off that, I would assume that the me from this world was in the city along with this world's Twilight." she finished.
"But what does that mean for you?" Fluttershy asked.
"I'm not sure. I have a feeling that it would be bad for me to meet myself in this world. You all can go and talk to this world's Twilight if you want. I'll stay here and write to the Twilight we know about it and see what she has to say. Maybe she can help tell us something about it and what we should do."
"But what about Flash Sentry?" Applejack asked. "Does he know that's not the Twilight he knows?"
They looked to Pinkie Pie who still had the phone to her ear. "What?"
"Aren't you going to tell him that's not Twilight?" Rainbow said.
"Tell who?" Pinkie said confused.
"Flash! Aren't you on the phone with him?" Applejack exclaimed.
"Oh, no. He hung up awhile ago to go talk to Twilight and Sunset." she said.
"You do know I'm right here, right Pinkie?" Sunset Shimmer said.
"Yeah. He went to talk to the doubles. Duh! Everyone knows that." she said smiling.
"Does Flash know? You did tell him they were doubles before he hung up right?"
Pinkie shrugged. "I dunno."
The others groaned. "We'll find him, and try to get him and explain it." Rarity said. "Sunset, do you really think Twilight will know what to do?"
"Well, from what she's written to me, the reason her friends from Equestria couldn't come was because it would cause some sort of magical paradox. She doesn't know what that would do, but it's not good. You go find them. I'll figure something out." she said.
"Alright, girls! Let's go!" Rainbow Dash said, running out the door. They all followed her and Sunset went back to her room.
Why is she here? What purpose could she have here? she thought. She reached and picked up the book from the drawer. She grabbed her pen and began to write in it. "Alright Twilight. You know more about this stuff than I do, so what do we need to do?" she said as she closed the book.
***
"Spike, can you hand me the books over there?" Twilight asked as she placed a few onto the shelf.
"Sure thing." he said, grabbing a stack and standing under Twilight as she hovered near the top of the bookshelf. She used her magic to grab the top half and placed them where she had marked. "Anymore after this?" Twilight asked.
"Nope. These are the last ones." Spike said, letting her take the rest of the books. "And good riddance. I'm tired." he said yawning.
"I appreciate the help Spike. Go ahead and get some sleep." Twilight said as she placed the last book on the shelf. She flew down and gave Spike a thankful hug. As he walked out and back to his bed, she walked over to the portal between Equestria and the other world.
"Maybe one day I could bring my friends over to their world. I'd love to see how they acted when they discovered all the different limbs they had." she smiled. She imagined Pinkie Pie and what she would say. She would probably be perfectly fine and get the hang of everything really quick.
She heard a buzzing coming from the table behind her. "That's odd. I just wrote back to Sunset Shimmer. Normally I'd get a message back from her after a day." she said as she walked over. She flipped open the book and turned to the new page.
"Dear Twilight,
I know we just wrote back to each other, but something has come up. Flash told Pinkie that he saw you and me with each other somewhere in town. That's not possible if you're in Equestria and I'm at my house. Something strange is going on, and I'm not sure how to handle it. I believe it may be our doubles from this world. The others went to investigate while I got in touch with you to figure out what to do. I doubt it would be a good idea for me to just walk up to my double. You know more about this than I do, so any information you can give us is helpful. I'm sure it's nothing too big, but I have a really bad feeling about this. I didn't tell the others, but I find it strange that our doubles are just now showing up here.
Your friend,
Sunset Shimmer."
Twilight finished reading the message and felt her heart drop. She knew that her double in the other world lived in the city, but she didn't think she would go to the school. "I have to talk to the Princess about this before something happens." she said as she grabbed the book and ran towards the station.