Fics like Some Sunny Day (full of mania for you)

Dipper knows Mabel didn't mean to cause it, but he can't help but curse when he lands through a rift into a town that's not his Gravity Falls. Now, he's all alone and tries to overcome the fact Bill has taken over the world in this alternate universe. And every living being knows the party never stops. Time is dead and meaning has no meaning. Existence is upside down and this version of Bill reigns supreme. He welcomes everyone, human and monster, to Weirdmageddon. While Dipper is desperate to get back to his own dimension, the strangest thing that comes out of Weirdmageddon is the fact this Bill is a lot different than the one who tried to kill him. He's much more watchful and obsessive to keep Dipper within his hands at all times. It'll take a miracle for Dipper to ever return home now.

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