Bill and dipper are in love and they know that dippers family wouldn't approve makes it look like Bill kidnapped him

The twins have been going to gravity falls every summer since weirdmagenon

Mabel's pov
I woke up in the attic and glanced at the clock that set on the night stand in between mine and dippers bed it read 8:46. Knowing dipper wouldn't be awake yet I thought I would be nice and wake him up. So I quietly got out of bed and snuck across the room. I then sprung up and onto what I was expecting to be my brother only to be met with an empty bed. 'Ok that's strange' I thought to myself