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1. Rec 34

   Disaster Coded || Error x Reader by Strawberry_Milk_Snake

   Fandoms: Undertale (Video Game)  

   • Not Rated
   • Creator Chose Not To Use Archive Warnings
   • F/M
   • Work in Progress

   27 Sep 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Error/reader
   • geno & reader
   • Sans & Reader
   • Geno/Reader
   • Sans (Undertale)
   • Frisk (Undertale)
   • Toriel (Undertale)
   • Papyrus (Undertale)
   • Reader
   • Sans Ensemble (Undertale)
   • idk how to tag
   • Isekai
   • Alternate Universe - Undertale Multiverse | UTMV (Undertale)
   • Aftertale Geno Sans (Undertale)
   • Error Sans (Undertale)
   • There’s a heaping helping of banter (I couldn't help myself)
   • Young Error
   • Slow Burn
   • Reader gets abused by author
   • Error is toxic before forced thru character development
   • Not Canon Compliant
   • POV First Person
   • Rest assured the MC is still Reader
   • No Y/n bc ig y’all don’t like that
   • Female Reader-Insert
   • Weekly Updates

   Summary

   There's only one rule for those capable of AU hopping: never bring a real person into the Undertale multiverse. But, like all rules, it was destined to be broken.

   Language:

   English

   Words:

   179,840

   Chapters:

   64/?

   Comments:

   113

   Kudos:

   165

   Bookmarks:

   34

   Hits:

   5,270

   Bookmarked by WaningCrescent444

   24 Jun 2026

2. Rec *

   The Party Incident and Other Embarrassing Anecdotes by poubelle_squelette

   Fandoms: Undertale (Video Game)  

   • Explicit
   • No Archive Warnings Apply
   • F/M
   • Work in Progress

   07 Dec 2018

   Tags

   • No Archive Warnings Apply
   • Sans (Undertale)/Reader
   • Sans (Undertale)
   • Papyrus (Undertale)
   • Mettaton (Undertale)
   • Grillby (Undertale)
   • Undyne (Undertale)
   • Alphys (Undertale)
   • Toriel (Undertale)
   • Asgore Dreemurr
   • Flowey (Undertale)
   • Frisk (Undertale)
   • Reader-Insert
   • reader is female
   • Fluff
   • based on tumblr aus and my real life woes
   • Attempt at Humor
   • Second-Hand Embarrassment
   • Eventual Romance
   • artstudent!reader
   • shipper!papyrus
   • Reader Is Not Frisk
   • monster racism
   • Bad Decisions
   • skele-smooches
   • Post Pacifist Route
   • Eventual Smut
   • Fake/Pretend Relationship
   • Coffee Shops
   • Skeleton Boyfriends
   • Slow Burn
   • Bad Puns
   • Awkwardness
   • Dream Sex
   • Gravity shenanigans
   • touch starved skeleton
   • Pining
   • Friendship/Love
   • still somehow faking the relationship even when in one

   Summary

   "so how do you know papyrus?"

   Too embarrassed to admit that you were a party crasher there for free food, you blurted the first thing that came to mind, "Oh, I'm, um, I'm dating his brother! But enough about me, how do you know Papyrus?"

   The skeleton snickered, "oh, you didn't know? i'm the brother."

   Language:

   English

   Words:

   150,429

   Chapters:

   48/?

   Collections:

   2

   Comments:

   3,895

   Kudos:

   9,080

   Bookmarks:

   1,438

   Hits:

   214,640

   Bookmarked by WaningCrescent444

   22 Jan 2026