He's faking it, Sans. (Undertale x Gravity Falls Crossover)
  • Reads 7,034
  • Votes 499
  • Parts 9
  • Time 1h 14m
  • Reads 7,034
  • Votes 499
  • Parts 9
  • Time 1h 14m
Complete, First published May 18, 2021
Mature
Weirdmageddon didn't just open the portal between the dream realm and the real world, it also opened up the portals to all worlds. One of them being Undertale. As a result, when monsters escape the surface, they find themselves by Gravity Fall on the summer after Weirdmageddon. 

But there's a problem. When Grunkle Stan's memories were brought back, so was Bill. He's back this summer, and wants revenge.

Oh, and now he wants Sans. Things get weird. Again.

(original cover go brr)
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Gravity Falls : Anything To Stay With You (Billdip)

18 parts Complete

It's Dipper and Mabel's third summer in Gravity Falls, but things don't go as smoothly as their second one. Weirdmaggedon has started all over again ; much worse than before. There are more hench-maniacs, more terror - more deaths. And when Dipper gets taken by Bill, will he finally get some answers? Like, how is Bill alive? Or, why is he creating another Weirdmaggedon? He has questions for himself. When should he go home? Should he try to stop Bill on his own? Why does he feel like he's... growing fond of the demon? Other Info : Dipper and Mabel are 14, turning 15 (in case you can't do math). There's a two year time skip at one point, so they'll actually be 16, turning 17 for the majority. The twins have grown up, so they don't do as much stupid stuff. And, yes. This is a Billdip. If you don't like, you don't read, ok? Good. Minor cursing : cr*p being worst. Occasional blasphemy. Ok! Enjoy the book!