I just wrote some possible plot down for myself. There are way too few Dusttale x reader stories out there.

Did I mention that I'm alright with doing collabs, if anyone wants to? Just reach out to me!

DusttaleSans x reader idea

... ok so...

This is not a multiverse thing with Nightmare and all. I want this to be in the Dusttale universe.

Dust and Frisk fought for many resets. Frisk dies one day and doesn't reset. Dust thought that it was to spite him. He stays alone in the underground, somehow lasting on food.
Dust gets very unstable, since his memories and mind (Papyrus) torture him.
After maybe weeks or months (Sans doesn't know) reader falls into the underground. They make their way through the underground
Sans is on edge, suicidal, but (Papyrus) his mind tells him, that he doesn't deserve such mercy as death, wasting all the LV he acquired through killing his friends and brother. So he doesn't kill himself, agreeing with his mind (Papyrus).
Sans often walks through the underground, hoping to find someone else, surviving his madness. He stumbles into the ruins and sees reader there.

(possible continuation:
1. Reader has just fallen down, lying on the patch of Buttercups unconcious. Dust finds them. Papyrus yells at him to kill the human, that would probably try to kill him and make him go through everything again. The genocide, etc.
Sans doesn't do that, feeling somewhat happy to have someone else he could mess with. Someone else he could talk to. Something new to expirience.
Sans is touch starved (lol)
Sans kidnapps reader and brings them to his home on the couch.

2. Reader is awake, processing what had happened to them. They had fallen down, and not died, to their displeasure. They looked around for a way to get out of this situation. They walk through the ruins and look around. It was kind of dark, but not making it unbearable. They suddenly meet Dust when stuck at one of the puzzles that were active.
Reader is very afraid while Dust just stares before him in disbelief, happy tears leaving his eyes as his smile widens. Papyrus yells at Sans to kill the human, while he just waves it off and starts talking to the human creepily.)

That would be all for now. I didn't think of much yet, but I wanted to show u people anyways. Who knows, I may write a book sometime soon??