My Name is Bill Cipher

This is Going To Be Fun

At seven in the morning, I hear rapping on the door. "Dipper! I know you're there! Open the door, it's dirty out here! Please?" Mabel and Dipper sleepily trudge down the stairs. It looks like they just threw on some clothes as soon as they heard the knock on the door.
"I'm coming, I'm coming," Dipper says, yawning. He unlocks the door and it swings open from the other side, the girl on the porch grinning ear to ear.
"Dipper!" she exclaims, clearly excited. She throws her arms around him and Dipper gives her a hug in return. "It's been so long! I haven't seen you since Christmas! Why didn't you come to visit? We always talked about it, but you never came! I was about to come down to California myself!"
"I'm sorry, Pacifica. I guess being in tenth grade was a bit busy," Dipper rubs the back of his neck guiltily. "But you're here now, and that's all that matters, right?"
"Yes," Pacifica answers, still smiling, blushing madly. To my surprise, they promptly kiss. Mabel mimics a disgusted look, her nose scrunched up, her tongue sticking out, but I can see how happy she is for them.
Melody and Soos enter the room. "Oh, hey, dude!" greets Soos when he sees Pacifica.
"Wow, I hardly recognized you," Melody exclaims. "All three of you for that matter, you're all so grown up!"
Pacifica's gaze suddenly clouds as she turns towards me. "Who are you?" she asks. I don't know what to do. I look to Dipper. Does he want me to say anything? Should I lie? Should I tell the truth?
"I... uh..." I offer my hand. "This may come as a surprise, but my name is Bill Cipher. I believe we've met before. You're the llama, right?" That was clearly the wrong thing to say because she screams and quickly backs away from me, her finger pointed towards me.
"His eye!" she shrieks. "That's him! Why is he here?! How is he here?! What happened?!"
Dipper takes her hand and says, "Hey, it's alright."
"And I'm afraid I can't answer most of your questions," I tell her. "But I'm here because... I'm here for their help," I mumble.
"You?! But you're a demon!" she shouts.
"No, well, not anymore. I'm human now."
     "I don't understand."
     "We don't either," Mabel tells Pacifica.
     "But you dare show your face after what you did to everyone here? After what you did to my family? After what you did to our town?" she steps up to me, furious.
     "I'm sorry," I growl. "I was dying- I had to come back."
     "Are you seriously so clueless that you can't even see how selfish that is?!"
     "Pacifica-" Dipper warns.
     Pacifica continues to shout at me. Does she realize who she's speaking to? I am Bill Cipher! "You have no right to speak to me that way!" I yell back.
     "Oh yeah?! Well I think I have every right!"
     "Do you know who I am? My name is Bill Cipher! You should be shaking at the sight of me!"
     "Yes! I am shaking! Not with fear, but because of how big of a idiotically insane, selfish jerk you are!"
     This sets me over the top. And something weird seems to change about me... I begin to laugh, not because of anything funny. I almost can't control it. It sounds insane and terrifying. It almost has the crazy echo it used to have. "THAT'S RIGHT!" I confirm, though I don't feel like I have control over my words. "I AM INSANE! I'M PLEASED YOU NOTICED! NOW, I WOULDN'T EXACTLY CALL MYSELF A JERK, BUT I GUESS THAT IS JUST YOUR LOWLY HUMAN OPINION! HAHAHAHA, THIS IS GOING TO BE FUN!" I reach my hand to strike her, it feels like the most natural thing in the world. Yet I still feel that I don't have control over myself...
     My thoughts are interrupted by a striking pain as someone hits my face. "Bill!" I hear Dipper's voice. He sounds terrified, worried. "Snap out of it! We had a deal, remember?"
     The next thing I know, I'm on the floor. "W-what happened...?" I ask, very confused.
     Mabel is shaking as she says, "Y-you, honestly don't know?"
     I can hardly remember anything since Pacifica came in. Everything else is a blur. Something happened. "N-no?"
     Melody and Soos are holding onto each other in the back of the room, Dipper, Pacifica, and Mabel are doing the same. "Your eyes, Bill. Both of them turned yellow, the left one, too. Your smile was so unnatural and your voice got all echoey again. You were out of your mind!" Dipper cries out. "I'm keeping our end of the deal, Bill. You won't hurt anyone I love!" Dipper's voice breaks.
     "I- I didn't mean to-"
     "GET OUT!" Dipper roars. He points to the door and pulls away from Mabel and Pacifica.
     "W-what?" I stutter. This can't be happening!
     "You heard me!" Dipper shouts.
     "Dipper, wait-" Mabel tries to reason with him.
     "No, I won't wait! He's dangerous, Mabel, I don't want him here!"
     "Please," I beg them.
     "Don't beg," Dipper tells me. "Something happened to you. I'm not saying it's your fault, but you almost hurt someone, I don't want to risk that again!"
     "You don't understand-"
     "I think I full well understa-"
     "STOP!" Mabel shouts. Everyone goes quiet. I've never heard her raise her voice before. "We told him we'd help him, and that's that." She walks over to me, ignoring a protest from Dipper and touches my hand reassuringly. I'm surprised. I've never had human contact before. It's... nice. "Don't worry, we'll figure something out."