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1. Public Bookmark 21

   What happened to my sister? by Charalover101

   Fandoms: Undertale (Video Game)  

   • Mature
   • Creator Chose Not To Use Archive Warnings
   • No category
   • Work in Progress

   18 Sep 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Sans (Undertale)/Reader
   • Sans (Undertale)/Original Female Character(s)
   • Papyrus (Undertale)/Reader
   • Papyrus/Sans (Undertale)/Original Female Character(s)
   • Papyrus (Undertale)/Original Female Character(s)
   • Sans (Undertale)
   • Papyrus (Undertale)
   • Unde
   • Alternate Universe - Underswap (Undertale)
   • Alternate Universe - Underfell (Undertale)
   • Alternate Universe - Fellswap (Undertale)
   • Alternate Universe - Horrortale (Undertale)
   • Underswap Sans (Undertale)
   • Underswap Papyrus (Undertale)
   • Underfell Sans (Undertale)
   • Underfell Papyrus (Undertale)
   • Fellswap Papyrus (Undertale)
   • Fellswap Sans (Undertale)
   • Horrortale Sans (Undertale)
   • Horrortale Papyrus (Undertale)
   • Antiharem
   • anti-harem
   • Trans Male Character
   • reader is trans
   • Guilt eating
   • Healing
   • Past Child Abuse
   • Abuse

   Summary

   Your were so happy when your big sister let you stay with her

   Now your not so sure

   Language:

   English

   Words:

   126

   Chapters:

   1/?

   Comments:

   2

   Kudos:

   110

   Bookmarks:

   21

   Hits:

   2,701

   Bookmarked by Ax3t0wn

   01 Oct 2026