Mabel Pines and her twin brother have been saving up for years for a chance to get to travel to the "Big City" for college— her dream job as a sweets shop owner, and his as a scientific researcher— and is thrilled once she finally, at age 21, gets the chance. Her old boyfriend, Gideon, isn't too pleased how quickly and willingly she left him behind, though, as she soon finds a new beau in the city— a very famous, very young, and very, very rich entrepreneur. Gideon makes a deadly deal, and Dipper has to figure out the whole plan and convince his sister of the problems at hand and corruption of her love before it's too late.
{A/N: This story is not nearly as "High School AU" cliché as it sounds.}