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Three Can Keep A Secret by New_Yorktown
Fandoms: Gravity Falls, Star vs. the Forces of Evil
28 Sep 2020
Tags
Summary
AU where Dipper remained set on accepting Ford's offer to learn. As a result, the Mystery Twins have grown into their teenage years somewhat distant from one another, until a fateful summer when Mabel is finally able to return to the strange town that stole away her brother. Dipper has changed a lot in the years since, exploring the unknowns of the universe and his feelings about a certain blond. However, even with all his newfound knowledge, Dipper has no clue about his sister's terrible secret, which she is determined to hide from her family no matter what. That may be more difficult than Mabel knows however, as Gravity Falls is a town where the dead don't sleep and the truth won't stay buried.
As the adventure continues, the intrepid explorers of Earth step through the portal to pursue a deadly threat and find a troubled kingdom. The friendly princess greets them with a smile, but hidden conflicts lurk beneath everyone in the land of Mewni. Who is the real threat?
Has it’s own TVTropes page, to my enduring surprise: https://tvtropes.org/pmwiki/pmwiki.php/Fanfic/ThreeCanKeepASecret