Everfree: A Gravity Falls fanfic (original character)

The Mystery 'Hack'

Kim's PoV
After following the map on the back of the flyer, I finally reached the Mystery Shack. The 's' had fallen off and was lying on the roof. I took a deep breath and stepped inside.
The inside of the shack was even worse. Stuffed animal corpses covered every inch of space. I was used to seeing a hunter's kills on display. But to make money off of it. That just made me sick inside.
As Stan Pines led the tour group and myself around the exhibitions, I made sure to remain calm and to fight my growing desire to break through the crowd and stab the man. When the group reached the gift shop, I headed over to the cashier to ask the employees there a few questions. As I walked, I carefully brushed my hair across the right hand side of my face to hide my markings.
The younger of the two girls spoke first. "Oh hi! My name's Mabel Pines. The guy next to me is my twin brother Dipper Pines, and the girl reading the magazine is Wendy."
"What's up?" Said Wendy.
"Wow! I didn't know that Mr Pines had kids." These three had to know something.
"Actually, Mabel and I are his great niece and nephew. Wendy works here." Corrected Dipper.
"Really?" This was certainly a change of events. "And how exactly does he get all  these animals?"
"Oh uh, we're not really supposed to talk about that." Stuttered Wendy as she put down the magazine. I smirked.
"Let's continue this little chat in the back room, shall we?" I said as the last customer left the shop.
Dipper leaned over the desk. "And why would we do that?"
I whipped out one of my knives and pressed it against his chest, letting my hair fall back to reveal the rest of my face. He turned white.
"Let's try that again: Let's continue this little chat in the back room, shall we?"
He gulped and slowly came out from behind the counter, the others behind him.
"Better." I hissed.
I kept my knife against Dipper's back as they lead me into the back room. Once they were all in the back room, I shoved Dipper forward and closed the door behind me. He placed himself between me and his sister.
"Now, tell me. Where does your Great Uncle get those animals?" I growled through gritted teeth.
"Why do you want to know?!" He snapped back.
"Ah!" I gasped. "You work for him as well as the redhead." She count the money while you two brats bring in the attractions! You deranged sick-os!"
"What the hell are you talking about?!"
"Okay, break it up you two." Said Mabel as she stepped between the two of us. "This is a misunderstanding and I'm sure we can sort it out."
"Oh I understand. I also understand THIS!" I cried as I leapt forward. The three of them all dodged me and I rolled onto the floor. I snapped. My alien genetics took over and I whipped round. I hissed.
"Aaaaaah!"