Mabelmageddon (Gravity Falls AU)

"Summer forever.Just you and me,Dipper.Isn't that what we always wanted?"
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Bill Cipher finds a new villain in need of his calling.Mabel Pines.A heartbroken girl who is scared of growing up and is afraid to lose her brother,who is on the edge of her fingertips.He manipulates Mabel,telling her if she joins him,he'll give her summer forever-but not in a way you'd expect.Soon the old Mabel dies and the new one becomes a power hungry demon bent on killing others.....and letting it be summer forever in Gravity Falls.How will her brother,uncles,and their friends react to this new demon?

(Original Gravity Falls AU made by me,want to write a fanfic on it or fanart,contact me and I might let you with some rules.)

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