Older Dippy (Dipper) x reader

you lived in Gravity Falls for about 15 years now. you moved there when you where 4 years old. You never meet dippers nor Mabel before because you went on vacation with your mom every summer to Las Vegas where you met you very best friend, Ash (ash is a girl). This summer you decide that ash should come to Oregon for this summer instead of going to Las Vegas to see her. what happens when you bump into Mabel, Dipper, and BILL!?!?!