This is my first Gravity Falls Fanfiction, so I hope that it is good. I am making this a little AU, so it is after Love God but before the Northwest Mansion Mystery. I hope that you all enjoy.

Chapter 1

Robbie's POV:

I sat in my messy room, listening to Heaven Help Us by My Chemical Romance, when I got a knock on my door. I figured it was my parents. I put my guitar down that I was tuning and opened the door. I instantly closed it because it was the one person I didn't expect. Mabel Pines, my arch-enemies twin sister.

"ROBBIE!" She said in her too cheery voice. Sighing, I opened the door again. Her braces shone in the dim light. "Wow, if it's possible, your rooms even messier then the last time I was here." Like she needed to remind me.

"What do you want?" My question was sharper then I meant it to be. There was no need to be mean to her. I was just if a bad mood, but then again, when wasn't I in a bad mood.

"I wanted to know how you were. I heard that you and Tambry broke up." There was sadness in her answer; sadness that I never heard from her. Quickly, as if it was never there, she smiled.

"I'm fine. Can you go now?" I said. The song changed to Teenagers by My Chemical Romance.

'They gonna clean up your looks
With all the lies in the books
To make a citizen out of you.'

"OOH, I like this song!" Mabel exclaimed. This confused me because she seemed like the kind of girl who liked Sev'ral Timez. She sang along with the words.

'Because they sleep with a gun
And keep an eye on you son
So they can watch all the things you do'

'Because the drug never work
They gonna give you a smirk
Cause they've got methods of keeping you clean
They gonna rip up your heads
Your aspirations to shreds
Another cog in the murder machine'

I quickly turned it off so that she didn't sing the next line; only because it has a cuss word in it.

"Aw, but I liked that song." She complained. I gave her a questioning look.

"Why do you like that song?" I asked. It was weird, even for her, but I didn't add that.

"Why shouldn't I?" She countered. "It's catchy, and he has a good singing voice." Mabel explained. She had a point. "Besides, I will be a teenager someday, and I want this song to be MY song." She had a smirk on her face. She turned an left my room. 'That was weird' was the only thought going through my mind.

Mabel's POV:

As soon as I left Robbie's house, I burst out laughing. I could not believe he fell for that. I mean sure I liked the song, but MY song, HA. My song would be Best Day of My Life by American Authors. I just wanted to freak him out.

And it so worked. Candy and Grenda came out from their hiding places.

"Did it work?" Candy asked. I nodded. I played with the helm of my sweater.

"Like a charm." I smiled. Best prank ever.

"I want to try next!" Grenda said. Me and Candy both shook out heads.

"Sorry Grenda, their might not be a next time." I explained. She looked sad. I placed my hand on her shoulder. "You don't need to be sad. Look on the bight side, the Northwest Party is coming up. I bet we can find a way to get in." I smiled.

"WHAT THE HELL?" I heard Robbie yell from inside. We all jumped. We ran to the window. Robbie paced in his room. That alone was a feat in and among itself. I noticed he had his phone in his hand.

"WHAT DO YOU MEAN BY THAT LEE?" He was very angry. He turned to the window, so we quickly ducked. "LEE, I DON'T CARE, WHERE IS TAMBRY NOW?" There was a small pause. "WITH THOMSON!?" His voice cracked. I remembered giving him and Tambry a love potion that belonged to a love god. I didn't know that she liked Thomson. I felt really bad now. The Love God was right, I shouldn't have messed with them.

I really messed up not just one person's lives, but three. Tears went into my eyes. I slide down the side of Robbie's house. I cried into my hands.

Robbie' POV:

To say that I was angry was an understatement. Thomson was with Tambry. MY GIRLFRIEND WAS WITH MY BEST FRIEND. I couldn't believe it. I was beyond angry.

I hung up on Lee, and grabbed the keys to my van. I ran out of the house and drove to Thomson's house. I parked and banged my fist on his front door. Thomson's opened without a shirt on. I instantly punched him.

My fist connected with his face. Blood poured down his nose. I was about to hit him again when a hand grabbed my wrist. I stun around to see Tambry in nothing more than Thomson's shirt.

"Robbie please don't hit him!" She yelled.

"How could you sleep with him?" My voice creaked. I ran my fingers though my hair. She was on the verge of crying.

"I... I don't know, Robbie. I'm sorry." I closed my eyes.

"Tambry, I'm the one whose sorry, but I can't let this go. I have to break up with you." I turned away from her and went back to my van. I drove to the one place that no one ever went except to cry. The park.

I parked and went to a bench and silently cried. I rarely cried, but when I did, it was usually over a girl. Like Wendy. Or Tambry.

I hated my love life.

A/N: Sorry for that, I wasn't expecting a Tambson scene, let alone one like that. But I hope that it turned out good. As always: REVIEW!