Fics like Undertale's Last Encore

On a lazy afternoon during a quarrel with Sans' favorite flowery menace, Sans finds himself in a strange place; a world between worlds that looks awfully similar to the surface and it turns out he's not alone. What begins as a strange encounter leads to even more stranger events that alter the word of Undertale as we know it. Enter Rin Tohsaka: The New Heroine, as we follow her descent into this new universe that she'll have no choice but to consider home.

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  14. Chaos chat: Kaiba and Futaba messed up by AxlTheSpiCatGen318, Narvgana_The_Void_Phoenix, Pestilence36, SonictheJedi2013, TokuMahouFan (One Piece (Anime & Manga), Persona 5, more)
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  20. Paring [Original Version] by TinyOwlThoughts (Undertale (Video Game))