Genie in a Bottle: Bill Cipher X OC

Venus was once the most powerful being in all the multiverse. She was the goddess of dreams and the ruler of the nightmare realm. That was till a certain triangle trapped her in a magic crystal bottle. Bill had kept her as a trinket, a prize, proof of his power. But when Bill was destroyed, her bottle became lost. Until a 16 year old Dipper found it on his and Mabel's summer break in Gravity Falls. But when Dipper releases her from the crystal, he awakens a much darker power.... ((mainly Bill X Venus, Little bit of Dipper X Venus, Definitely gone be some Mabecifica at some point))