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1. Heavy Is The Head by Acoustic_Meatus

   Fandoms: Undertale (Video Game)  

   • Explicit
   • No Archive Warnings Apply
   • Multi
   • Work in Progress

   31 Jan 2026

   Tags

   • No Archive Warnings Apply
   • Papyrus (Undertale)/Everyone
   • Grillby/Papyrus (Undertale)
   • Muffet/Papyrus (Undertale)
   • Papyrus (Undertale)
   • Sans (Undertale)
   • Undyne (Undertale)
   • Grillby (Undertale)
   • Alphys (Undertale)
   • Mettaton (Undertale)
   • Napstablook (Undertale)
   • Muffet (Undertale)
   • Gerson Boom
   • Snowdin Canine Unit
   • Temmie (Undertale)
   • no im serious about everyone
   • Explicit Sexual Content
   • Ritual Sex
   • Not Canon Compliant
   • Post-Undertale Neutral Route - King Papyrus Ending
   • Sibling Incest
   • Rarepair New Year Event
   • Rarepair New Year Event 2026
   • Xeno

   Summary

   A human child leaves the underground leaderless, and Papyrus steps in to fill the gap. Well, something is going to get filled, anyway.

   Sans isn't like, super thrilled when he remembers just how it is that someone becomes a boss monster.

   Language:

   English

   Words:

   7,096

   Chapters:

   3/?

   Collections:

   1

   Comments:

   20

   Kudos:

   27

   Bookmarks:

   3

   Hits:

   199