Celestia screamed as Xander raised his sword to strike her down. She was not expecting this from the person she had sheltered and was too horrified to fight back. All she could do was sit there and scream. Xander threw his sword down to slay her when he stopped and Celestia felt a liquid drop onto her: blood. The human looked at his shoulder where a small pocket knife was poking out.
"Oy, jackass," someone called from behind. "Leave Sal alone!" Celestia looked past Xander to see... well... Xander. This one, however, looked exactly like the one who she knew. Black leather jacket, longer hair, even the large sword he showed up with. "And if you don't mind, toss me my SOG back."
"Damn, I thought you were preoccupied," the denim jacketed Xander said. "No matter, I'll just kill you first."
"Not if I beat you to it," the leather jacketed Xander replied.
"W-what's going on?" Celestia questioned.
"Glad you asked," the Xander she, for the most part, trusted replied. The evil Xander was knocked away from her and the good Xander was standing in his place. "You see, everybody has a dark side. When stressed, the dark side will often take control of your body. Like your sister and Nightmare Moon..." He was cut off, trying to block a blow from the evil Xander. "My friends and I call them our Second Players, or 2Ps."
"Then why is your '2P' right there?" she questioned.
"I used to be really good at dealing with stress until I moved away from my home," he said while striking at his Second Player. "One day, I was so stressed that my 2P took over and tried to kill the people I had problems with." He again had to block another blow from his 2nd Player, though he followed it with a counter attack.. "However, our wills to remain who we were were so strong, we split into two separate beings." The 2P made yet another attempt to attack Xander, but this time it succeeded and jammed into his shoulder. "Ow, mother...! penis..." he screamed, though the last word made it out more subtly. He grabbed the wakizashi and threw it out of his arm. The good Xander kicked his 2P in the groin before bludgeoning him with the side of the broadsword.
"What, you too afraid to kill me?" Xander's 2P laughed.
"No, I'm just a better person than you," Xander said, frowning. "You have fun trying to kill others, where as I have fun watching them frolic. You try to level entire civilizations where as I try to help them thrive. And, just to spite you, I'll never kill you. You may try and try and try, but I'd never kill you."
"Heh, you're just a wuss," 2P Xander said.
"Maybe I am..." Xander said. "Maybe I am... Now, get out before I beat the everloving snot out of you."
2P Xander ran toward a window and dove out it, basically falling down the entire mountain. "Well that wasn't smart..." said Xander, staring at the window his Second Player jumped out of. He swirled his sword behind him and stabbed it back into his sheath. Then he turned around to face the princess, noticing how the room was trashed by the fight. "Sorry 'bout that," he told her. "I didn't expect to see him here."
"You lied about not remembering anything, didn't you?" Celestia asked, raising an eyebrow.
"No, I didn't," Xander replied. "I remembered over the course of the day. I regained most of them while visiting the taylor. I noticed a nice denim jacket and thought it might look good, but as I looked into the mirror I began to remember everything. My childhood, my time with my friends Feliciano and co., my stay in Treehut, everything. I even remembered why I came here... Him."
"My friend Rome gave me this sword before he supposedly died," Xander continued, unsheathing his sword. "I've only used it to fight for justice... and in one case women, but I was really immature back then." He raised the sword into the air. "I fight for what I believe in: Honor! Justice! Life!"
Sadly, Luna entered in once he finished speaking, and she had not heard anything through the soundproof walls of the throne room. "Sister, you've been in here for quite a while," she started, not having noticed anything. "Is everything..." Finally, she saw it. The blood spattered on Celestia, Xander with his sword in the air, his left shoulder bleeding, the two dead guards on the floor. Luna was stricken with fear, unable to move.
Xander turned around, dropping his sword on the ground. "Well... you've caught us at a bad time, it seems..." he said, trying to keep a poker face as good as possible. "I... don't think I can explain this and seem sane, so I'm just gonna..." Quickly he grabbed his sword and bounded out the window, stabbing the sword into the wall, using it as leverage to launch himself back into the town, though the landing was still rather rough.
"Sister, what did he do to you?" Luna asked. "What happened to the guards?"
"N-nothing," Celestia stuttered.
"You're just trying to protect him, aren't you?" Luna interrogated. "He said he'd kill you if you told, didn't he?"
"No, that's not it at all!" Celestia said. "He actually saved my life."
"He did?" Luna asked. "From who?"
"Um... himself?" she said, not sure how that would sound.
"I... I don't think I follow..." Luna said, hesitantly.
"Look, I'll explain, but it won't make too much sense," Celestia said. 'Wait, she has suffered the fate of having to deal with her 2P... maybe she will understand... Hold on, how did Xander know about Nightmare Moon? No matter, I'll ask him later.' "Alright, well..."
Author's note: Before I post any more chapters, I'ma post the prequels to this story. Believe it or not, this is intended to be the third story in the series, though that didn't pop into my head until I began to get into the Hetalia 2P stories and Animal Crossing: New Leaf. I'm going to update these periodically, starting it with a Hetalia fic followed by an Animal Crossing fic. Sorry for the sudden change of plans.