Did you miss me?

Dipper returns to Gravity Falls after two years, hoping to reconnect with his family and friends. But the trauma of Weirdmageddon still haunts him, and strange hallucinations and vivid nightmares of Bill Cipher make him question if the demon is truly gone.
As Dipper confides in his great-uncle Ford, he becomes increasingly torn between hiding his fears, unsure of who to trust and how to deal with his growing anxiety. But when he disobeys Bill and Ford gets hurt, he starts to feel guilty. Dipper's growing isolation and emotional turmoil leave him feeling increasingly out of place. Haunted by Bill's presence, Dipper begins to question his own role in Bill's sinister plans.
As the mystery deepens and Dipper's bond with Bill strengthens, Dipper's internal struggle intensifies. Can he break free from Bill's manipulative grasp, or will he succumb to the dream demon's influence? With unresolved misunderstandings rising between family members, continual manipulations, isolation, and Dipper's emotions spiraling, the lines between friend and foe blur.
Dipper finds himself struggling with guilt, confusion, and a growing sense of dread, unsure of who to trust and unable to seek help from those he loves. With the lives of his family and himself on the line, he's forced to make many difficult decisions. Can a mere 14/15 year old overcome the lingering influence of Bill Cipher, or will he become a crucial member in this game? Will he unravel the truth in time to save everyone? And just how much is he willing to risk to do so?

{Please note that I may kill off characters. However, I'm not certain as yet.}

(This may not be accurate - it is fanfiction, and I haven't rewatched the show. Also, I haven't read The Book of Bill. I only have a general idea of how this story will go, so I'll be figuring out most of it as I go. I advise reading the tags. Lastly, the show and characters that are in the show don't belong to me. They belong to Alex Hirsch and the team.)