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  1. UDY on the Surface by

    Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)  

    13 Dec 2025

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    Summary

    It's been a few years since Monsters returned to the Surface and lots of things have changed... Accompany your favorite characters from Undertale, Undertale Yellow and Deltarune as they try to manage their everyday responsibilities and go through a few wacky adventures while at it in this slice-of-life crossover AU.

    Language:
    English
    Words:
    81,003
    Chapters:
    22/?
    Comments:
    40
    Kudos:
    65
    Bookmarks:
    11
    Hits:
    2,733

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