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   The House Next Door by BattleMaiden13

   Fandoms: Undertale (Video Game), Underfell - Fandom, Underswap - Fandom, Swapfell - Fandom, Mafiatale - Fandom, Mafiafell - Fandom, Mafiaswap - Fandom  

   • Mature
   • Creator Chose Not To Use Archive Warnings, No Archive Warnings Apply
   • F/M
   • Work in Progress

   14 May 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • No Archive Warnings Apply
   • Reader/Everyone
   • Sans (Undertale)/Reader
   • Papyrus (Undertale)/Reader
   • Underfell Sans/Reader
   • Underfell Papyrus/ Reader
   • Underswap Sans/Reader
   • Underswap Papyrus/Reader
   • Swapfell Sans/Reader
   • All skeletons/Reader
   • reader/oc
   • Reader
   • Sans (Undertale)
   • Papyrus (Undertale)
   • Underfell Sans - Character
   • Underfell Papyrus - Character
   • Underswap Sans - Character
   • Underswap Papyrus - Character
   • Swapfell Sans - Character
   • Swapfell Papyrus - Character
   • Alternate Universe - Underfell
   • Alternate Universe - Underswap
   • Alternate Universe - Swapfell
   • Fluff
   • Probably some angst
   • Reader has some sass
   • Reader works 3 jobs
   • Reverse Harem(?)
   • Female Reader
   • Swearing
   • Reader has a big family
   • It's a real slow burn
   • Other romantic interest
   • Getting to Know Each Other
   • First Dates
   • Yandere
   • OCs - Freeform
   • Alternative Universe - mafiatale
   • Alternative Universe - Mafiafell
   • Alternative Universe - Mafiaswap
   • Alternate Universe - Horrortale (Undertale)
   • Alternative Universe - Mirrortale
   • did I mention slow burn
   • Reader dates someone else
   • Guns
   • Shooting Guns
   • mentions of depression
   • Mentions of Suicide
   • Blood
   • Blood and Injury
   • Violence
   • physical violence
   • Forced Relationship
   • Blackmail
   • Kidnapping
   • Scars
   • Implied/Referenced Self-Harm
   • first kiss chapter 100
   • is there even romance
   • Yes Romance
   • Friends to Lovers
   • Polyamory
   • Light Incest
   • The skeletons want to share MC
   • But they're kind related
   • So sorta incest
   • They don't wanna bang each other
   • Just the human
   • And they'd do it together if need be

   Summary

   The first time you met monsters you manage to run into four of them and literally run into one of those four. Now they are apparently moving in next door with their siblings and you can't seem to imagine a life without monsters. On the plus side they tell horrible jokes and have endless amounts of energy. So what could possibly go wrong.

   Part 1) Chapters 1-138
   Part 2) Chapters 139 - ???

   Language:

   English

   Words:

   961,042

   Chapters:

   204/?

   Comments:

   5,788

   Kudos:

   8,073

   Bookmarks:

   1,183

   Hits:

   414,254

   Bookmarked by tmiah40

   08 Jun 2025

   Bookmarker's Collections:

   • Undertale

   Bookmarker's Notes

   We