A/n: If this scenario triggers you, please do not read then.
Scenario 1 (Everyone is above the age of 21 :3)
Gravity Falls had strange laws but the drinking law had never changed before. You weren't very fond of drinking but on special occasions you can't help but have one or two drinks. When the Pine's family invited to the local bar for a few drinks (in Tiffany's case more than a few), you...
Scenario 2 (You can be underage to drink like Mabel and Dipper):
You weren't really fond of the scent of alcohol. On a few nights, Tiffany comes home with the strong scent of alcohol on her. She's not aggressive, she's just very...childish. Ryan's level of childish. While you were baking with (Crush) in the Mystery Shack, Tiffany came into the kitchen, this time a light scent of vodka on her. You...
