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1. Ink Stain on My Heart by Lonely_Hearts

   Fandoms: Undertale (Video Game)  

   • Not Rated
   • Graphic Depictions Of Violence
   • Multi, Other
   • Work in Progress

   03 Oct 2026

   Tags

   • Graphic Depictions Of Violence
   • Sans (Undertale)/Reader
   • Sans (Undertale)
   • Reader
   • Sans Ensemble (Undertale)
   • Dreamtale Sans | Dream (Undertale)
   • Dreamtale Nightmare Sans (Undertale)
   • _____tale Sans | Ink (Undertale)
   • Underswap Sans (Undertale)
   • Error Sans (Undertale)
   • Horrortale Sans (Undertale)
   • Something New Sans | Killer (Undertale)
   • Dusttale Sans (Undertale)
   • Fake/Pretend Relationship
   • Complicated Relationships
   • Error Sans Has Issues (Undertale)
   • _____tale Sans | Ink Being an Idiot (Undertale)
   • _____tale Sans | Ink Being a Jerk (Undertale)
   • _____tale Sans | Ink Being a Little Shit (Undertale)
   • Unhealthy Relationships
   • Stalking
   • Emotional Manipulation
   • Reader Has a Purple Soul (Undertale)
   • Reader Has a Cyan Soul (Undertale)
   • Reader Has an Original SOUL Trait
   • Gender-Neutral Pronouns
   • Existential Crisis
   • Existential Angst
   • Memory Loss
   • Let Swap Sans Say Fuck
   • Reader Is Not Frisk (Undertale)
   • Reader Is Not Chara (Undertale)
   • Reader-Insert
   • Gender-Neutral Reader-Insert
   • No Use of Y/N for Reader-Insert
   • Or at least VERY little use as i dont like using it
   • Dream Calls Reader Starlight to compensate for no y/n
   • Other Additional Tags to Be Added
   • Canon-Typical Violence
   • Manipulation
   • Nightmare and Dream are on very vaguely amicable terms
   • but only vaguely. ya know. the war and all

   Summary

   You can't love something that can't love you back. Well, you can, but you really shouldn't.
   That's how you got thrown into a battle of tug-of-war between two pseudo-deities. Both Ink and Error want to have you for themselves and neither are willing to let go.
   With them at each other's throat and around every corner you turn, what do either of them want with you? What does Error know that you don't?
   How long can you keep your sanity when two deities are fighting to be your 'datemate'?
   You're going to pull your hair out before you get any answers.

   Series

   • Part 3 of Stains of the Heart Extended Universe

   Language:

   English

   Words:

   5,494

   Chapters:

   2/?

   Comments:

   2

   Kudos:

   15

   Bookmarks:

   6

   Hits:

   168