*4 years ago, In Volcano Rock City*

*Princess Barb was in her room asleep*

*In Barb's dream*

*Barb was in a field*

Barb: Hello? anyone here?

*Then she hears cackling*

Barb: WHO'S THERE?!

*then a black triangle with an eye wearing a top hat and bow tie appeared in the sky and it turned yellow*

Barb: AHH!!!

???: Whoa calm down, redhead! don't have a heart attack you're not 93 yet

Barb: Who- who are you?!?!

Bill Cipher: The name's Bill Cipher and you?

barb: Princess Barb of the Hard Rock trolls

Bill Cipher: Barb huh? Kinda reminds me of barbed wire if ya ask me

Barb: Yeeah, what are you doing in my dreams?

Bill Cipher: Well, if you don't know sweetheart I go around haunting random trolls dreams cause I get lonely and I'm lookin' for a mate and was wondering if you could get me out of the dream realm and enter your world so whaddya say barbie?

*bill asked barb as he held out his hand and it emitted a blue fire*

Barb: Okay don't call me barbie or sweetheart and also Uh, YES! Of Course, I'll do it! I'd do anything to gain dream demon powers

*barb shook his hand*

*Barb woke up and bill was levitating right beside her*

Bill Cipher: See? What'd I tell you barb? I'm in your world now and we're now mates

Barb: wait doesn't that involve...

Bill Cipher: well no to be my mate you shake my hand or just to make a deal with me whatsoever

Barb: wow cool

Bill Cipher: Oh yeah and I think you and I are gonna get along just FINE

*bill said smugly as he stroked barb's cheek*

A/N: Wow my first ever Trolls and Gravity Falls crossover book I feel pretty darn good about it!