Pacifica

Grunkle Stan was startled by a quick blast of confetti in his face.
"Well, the confetti cannon works!" I said. "Oh, and look at all the songs the karaoke machine has. Grunkle Stan, Love Patrol Alpha will be singing all night!"
"Trust me, you don't want to hear this voice sing." Grunkle Stan said, wiping away a piece of confetti from his eyebrow.
"Grunkle Stan, karaoke is not about sounding good, it's about sounding terrible together." I said, emphasizing the last word.
"Hey, Pacifica." I turned around to see Dipper standing behind me.
"Oh, hi Dipper!" I said.
"You! Get off my property!" Grunkle Stan said.
"Relax, I don't have Ebola. I just came to get something I forgot here." Dipper said.
"Oh! Your journal. I'll go get it!" I raced into the Shack and up the stairs to me and Gideon's room. I took Journal #2 out from under a few books and was about to go back downstairs when something fell off one of the rafters.
"Huh?" I saw one of my stuffed animals lying on the ground. "How did that get all the way up there?"
Gideon probably put it up there for revenge when I stole his hat yesterday. I rationalized. Like a stuffed animal could float all the way up there by itself in the middle of the night. I don't think so.
I ran back downstairs and outside, where there was an awkward silence and glaring contest between Dipper and Grunkle Stan as they stood there. Yikes.
"Here's your journal, Dipper!" I handed it to him.
"Thank you." He said.
"So, are you staying for the party?" I asked him. "There's karaoke!"
"Karaoke?" He looked around and his eyes fixed on the karaoke machine. Beads of sweat started to drop from his forehead. "I would really love to, but... I should probably rehearse for tomorrow night's show and catch up on some reading..."
"Oh, okay." I grinned, trying to cover up my little bit of sadness. "It's fine. I hope you have fun."
"Not as much as you will be having." He said, and kissed me on the cheek. "Bye, Pacifica."
"Bye!"
I turned around to see Grunkle Stan looking shocked as Dipper walked away.
"Are you dating him?!" He demanded, surprised.
Whoops... forgot I never told him about my relationship with Dipper.
"Oh...um...yeah?" I bit my lip.
He reached a hand up to his head. "I need to go process my great niece dating one of my mortal enemies. If you need me, I'll be selling tickets."

Gideon

"Look! The black lights make my teeth glow!" Wendy said, as we hung up posters. "It's like a crime scene in my mouth! C'mon, it's cool."
"It's not fair. I could finally solve the mysteries of this town and Stan confiscated their card." I sigh.
"I probably shouldn't tell you, but Stan hides, like everything in his room." Wendy said quieter.
"We could get in a lot of trouble." I said.
"That's what makes it fun, dummy!" Wendy said, putting a party hat on me.
We went into the Shack, leaving the posters on the ground, to The door of Grunkle Stan's bedroom.
"I'll stay out here and keep watch. You go rustle through his weird old man stuff." Wendy said.
I looked up at the door. A picture with my face crossed out and a sign that said "NO MINORS ALLOWED" hung on the door.
I reached up to turn the door handle, and the door creaked open into Grunkle Stan's dark room.
I walked inside. The single bed was messily made and mugs with several day old coffee sat on the tables.
I opened up a drawer, but inside was "Gold Chains For Old Men Magazine". I looked inside another drawer, but there was just brass rings and boxing gloves. I opened up a chest and saw women's clothing catalogues.
"Ew, pretending I never saw that." I quickly closed the chest. Above the chest was a painting of Grunkle Stan which hung weirdly on the wall. When I reached out to straighten it, the painting opened to reveal a box labeled "Contraband" with miscellaneous items Grunkle Stan had taken away from us over the summer. One thing that stuck out at the top was the FBI agent's card. Excited, I took it and dialed the number on a telephone by Grunkle Stan's bed.
"Hello, this is Agent Powers."
"Hi, this is Gideon, the kid from the Mystery Shack with the...sweating problem. I have that journal I want to show you." I nervously coiled the wire around my finger.
"And you are certain this journal will help our case?"
"One hundred percent."
"Very well. We're on our way."
A finger jabbed the button to end the call. I turned around to see a furious Grunkle Stan. Wendy was standing nervously in the doorway.
"Sorry, I got distracted." She held up her smartphone, which had a picture of Thompson destroying the Stan-piñatas.
"Kid, I've told you once, I've told you a thousand times." He grabbed the phone from me. "Nothing supernatural is in Gravity Falls!"
"Yes, there is. After everything that has happened you have to know that!" I protested, but Grunkle Stan didn't believe it for a second.
"Your dumb obsession is going to get us in trouble someday. Now go and enjoy the party, because when it's over, you're grounded."

Pacifica

"Dipper! You came back!" I said.
"Yeah, I thought I saw FBI agent at my house, and I figured karaoke was better than an interrogation." He said.
"Great!" I handed him a microphone. "You can sing up next! Your choices are 'Let It Go' or 'Anaconda'!"
"Oh...um..." He scratched the back of his head nervously. "Let's let everyone else have a chance to sing first."
"Please?" I pouted. He relented.
"Fine." He groaned.
"Don't worry, we can sing together!" I said, picking up the song book and looking through it. "We can sing a slow song!"
Dipper didn't look happy.
"Don't worry, we'll do great!" I exclaimed. "But you might want to clean that little bit of blood off your shirt."
He looked down, and frowned. "If anyone asks, it's punch. I'll be back shortly, just need to go to my house and change. Possibly find a way out of karaoke."
"And don't forgot our Free! marathon after the party!" I yelled after him as he walked quickly away.