Unexpected Friend(BillxReader)
(Y/N) is spending her first summer with her younger twin siblings, Dipper and Mabel. A new adventure awaits, right? It's only been a year after Weirdmageddon, and everyone is still shaken from it. Fortunately for (Y/N), she didn't have to experience it, so now she can explore all of Gravity Falls and it's wacky myster...