So, I recently got into Sally Face thanks to my friend Torchicflame123 who also gave me the idea for this, so basically it's a Deltarune/Sally Face crossover-thing
We can do whatever kinda thing you want, like, the mains of Sally Face(Sal, Larry, Ash, Todd, etc.) in the Dark World or the mains of Deltarune(Kris, Ralsei, Susie, Lancer if you want) in Addison Apartments :3
In those two cases, the mains of both games will be there, you can even do it like someone's trapped in DR or SF without the others and everyone's working to get them back into their world.
The third and fourth scenarios is that the DR mains take the place of the SF mains and vice-versa

Well, have fun with this! <3~