In spite of the invitation the Darkners and the entire kingdom received to join the above ground world, there are still a few left behind within the otherworldly caverns, lost, hopeless, or in Jevil's case, still locked up. Charlie, a human representative for the rights and acts of monsters, has traversed to find who's left. Spoilers, and eventual NSFW. This is a possible AU.
Undertale - Rated: M - English - Fantasy/Romance - Chapters: 4 - Words: 3,830 - Reviews: 6 - Favs: 6 - Follows: 7 - Updated: 11/27/2018 - Published: 11/25/2018