A.N:Hey This is a Harry Potter and Gravity Falls Crossover.
Disclaimer:Don't own anything but a bunch of books.
Harry was battling death eaters in the middle of the third task when one of them sent a green spell flying right at him. His first impulse was to run,thinking it was a killing curse but it sent him spiraling through a rainbow colored tunnel an him landing right outside the mystery shack.
He looked around at his colorful surrondings.'Great' he thought. He went up to the door and knocked. A girl in a colorful shooting star sweater answered."Dipper,a boy is here!"she shouted. "Mabel wha- oh! Come right in."said Dipper."So,what's your name?"asked Dipper."Er-I'm Harry."he said.
"Harry?HAHAHA!"shouted Mabel."What do you have body hair or something?"she asked."No"said Harry."Mabel!I'm sorry about her, come on are you lost?"asked Dipper.
"Yeah sort of."said Harry.'You have no idea.'he thought. "You can stay at the mystery shack,come on,come meet our Grunkle Stan!"said Mabel.
Stan was very hesitant to let Harry stay,until he agreed to work at the shop with no pay."Sorry about our Grunkle,he's just money crazy."said Dipper."You'll be staying in the attic with us,I'm sorry to say you'll have to sleep on the floor."said Dipper."It's okay."said Harry.
So the twins and Harry headed up to the attic where Mabel sat on her bed,playing with her pig,and Dipper layed back reading out of this weird book."What are you reading?"asked Harry."I-oh-uh-look man,can I trust you?"he said.
Harry nodded hesitantly."It's a jornal about all the weird things here in gravity falls!"he told Harry everything he told harry about how the author vanished without a trace,how a dream demon named Bill Cipher tried to kill them,and about the society of the blind eye.
Harry was and Mabel have been through so was and Dipper spent most of the night talking about Dipper fell asleep and he was the only one window busted open and a huge wind came bustiling got sronger and stronger.
The moon grew a pupil and Harry could make out the form of Bill Cipher."Hey,Dipper told me about you!"He yelled."Woah Woah Woah, relax kid,jeesh!"said Bill."I'm just here to make a deal with you!"he said."I'll never make a deal with you Dipper told me what happened last time he made a deal with you! "yelled Harry.
"Well Dipper can go stuff it!"yelled Bill he relaxed and became yellow."You're really stubborn lightning bolt,hats off to you!"he said cheerfully and the world flipped over."Anyway,I'll be watching yoooooooou!"he said and Harry saw him go in the Bill Cipher wheel wich now had a new symbol,a lightning bolt.