billdip- damn you bill!

Dipper and Mabel are now 18, they just finished school and came to visit their gruncles.
the twins got to meet their old friends from Gravity Falls: Soos, Candy, Grenda, MC'gucket, the cops and Wendy.
dipper waited for years to be old enough to date her, and now that he's 18 he should finally get a 'yes' from her.
when he went to talk to her something changed, he couldn't put his finger on it, but something in the way they talked changed. after a few days of that weird new vibe between them, Dipper had an encounter with an old not so much of a friend, and now he might know what's wrong.