Things aren't going well between Celestia and Luna. As tensions grow between them, it is quite clear that they simply aren't the same ponies they once were. Instead of risking the loss of each other's companionship, both agree that perhaps some distance would help them recover a little. Besides, Celestia could use the vacation anyways.

But the beach town of Dusk Falls is hardly the peaceful and quiet abode Celestia had been expecting. Amongst the boardwalks and carousels a sinister plot is unfolding, as trouble rises both in the heart of Equestria and in Celestia's new home.

Cover-Art Celestia Vector here and the picture in the letter 'D' is here.

Discord decides to take revenge by taking over Equestria and sends Princess Celestia and Princess Luna to Gravity Falls where they become human girls. They meet Dipper and Mable Pines and ask for help to get back to save their home.

The portals open and the 3 journals have been found. What adventures await Dipper Mable and Soos when the find themselves changed in to colourful horse as well as teleported to a whole world full of the same colourful horses? Also what connection does Bill Cipher have with the Lord of Chaos?

Dipper wakes from another nightmare and Mabel seeing her twin is sad like her she joins him but what if the bottomless pit isn't so bottomless? what will Stan do to find the kid's gone? and why are all the Stancake's gone?.
P.S has some sad themes to it and that last question was random also I might add a bonus chapter leave a comment on what you think.
Another one of my gravity falls remix story probably going to suck but hay It's still up.
Idea from the cake devil
look him up relay awesome.