Top 10 Best Mature Undertale Fanfics

by Or13M · Sans/Reader

When the quiet solitude of your new life is disrupted by a gaggle of skeletons moving in next door, you and your sibling find yourselves pulled into their orbit. Healing takes time, but maybe, this chaotic, affectionate family is exactly what your soul has been waiting for. *Inspiration taken from "

by LemonCake64 · Mettaton/Papyrus

“Not so fun being stuck in some loop right? Trying to fight to protect what ya got, not getting a choice in it. If I had the choice I wouldn't remember either.” The words oddly felt comforting. Link let out a slow breath, closing his eyes for a brief moment. He didn't feel alone for the first time i

by Mayumara · Sans/Reader

You were an ordinary maintenance worker, part of the crew of the Aurora when it crash-landed on an alien world and left you stranded in a hostile ocean. There are probably worse places to be stuck; at least the scenery is pretty, and you've always been passionate about marine life and alien research

by B3_l · Sans/Reader, Papyrus/Reader

[Honestly.. After everything you've been through you didn't expect to find yourself here, in the middle of a fight between two men you recognized too much to be normal, with your unconscious husband in your arms having a near death grip on both newborns while you could at least stand without feeling

by Sviddal · Sans/Frisk

Summary:Aliza had always known she was meant for more than her grandmother's abuse, than her exclusion from society. It was only with the finding of Frisk's journal, and the climbing of the cursed mountain, that she truly came to know her purpose, though. The story of Axetale, created by thebananafr

by callmealoser · Papyrus/Reader

You’re a 23 year old who’s been living in a mansion you inherited from your Grandmother for a couple of years now. Your days consist mostly of chain smoking, drinking, sleeping, and scrolling. The house is huge, dark, and lonely. One day, out of pure boredom (and NOT loneliness) you post an ad looki

by Lireyy · Sans/Toriel

Monika is tired - oh so very tired. It's been what feels like eternity stuck in the post-deletion void, and despite herself she tried to make an escape with her friends (or, what's left of them). In her desperation and loneliness, she allows herself to be used by a certain piece of malware, who now

by RetroWrites · Sans/Toriel

Frisk has freed the monsters.Now all they need to do is to live on the surface.Campy story with plot and sad stuff on top of regular Undertale shenanigans.

by Solysteria · Sans/Frisk

"We are strangers, you and I,What makes us different from who we once were and will never be?We are no longer the same, it is a fact,So why does the pain remain the same?" ★ ★ ★ Error has spent his life trying to forget Ink, the one he once believed was his everything. Now, nearing his 30s, he is re

by Acefirstbase · Alphys/Undyne

Spamton G Spamton has one goal with this masters program in journalism: to secure the coveted internship with the biggest television studio in town. But he has a problem. A BIG one. And said BIG problem also happens to be his roommate. Tenna is also vying for this position, along with the other two