ao3.life

Horror/Crossfan fiction

Relationship · 48 works

Some results are potentially explicit

Undertale (Video Game)

Deep, Deeper, yet Deeper

by orphan_account

Cross is on a solo mission and ends up fighting Ink(and sorta confronting his past). It does not go well.(part 1 of a loosely connected series of oneshots! any can be read alone)

Teen 966 words 1 ch Complete 259 kudos

Alternate Universe - Canon Divergence · Angst · Angst with a Happy Ending · Blood· +24 more

Undertale (Video Game)

It's Gonna Get A Little Weird

by Heartstars_11

Cross has been sent on a mission to spy on Nightmare and his "goons", and he isn't too thrilled about it. However, something about the gaggle of murders seems amiss. Why are they being so nice???

Teen 1k words 1 / ? ch In progress 44 kudos

Alternate Multiverses · Dreamtale Nightmare Sans (Undertale) · Dreamtale Sans | Dream (Undertale) · Dusttale Sans (Undertale)· +11 more

Undertale (Video Game)

Make the Most of Those

by ItzOopaYall

Horror, Cross, and Killer anxiously await the return of their partners.

Teen 1.3k words 1 ch Complete 33 kudos

bad sans poly - Freeform · Polyamory · Underverse · utmv - Freeform· +12 more

Undertale (Video Game)

The right (wrong) way to adopt a child

by Sea_unicorn

This was it. She was doing it tonight. She was finally escaping and getting out of town.Until she got rescued from the police by some terrifying skeletons.Enjoy!

Teen 3.9k words 2 / ? ch In progress 25 kudos

Alternate Universe - Modern Setting · Angst · Bisexual main character · Fluff· +12 more

Undertale (Video Game)

Under the Sea

by Makis_Stories

My first MerMay ! It will mostly be short drabbles about either Leviathantale or Megalodontale as I love these AUs <3 Both AUs and the MerMay bingo belong to @/skumhuu on Tumblr ! ( on which I will be cross-posting this story @/mikimakiboo )

General 20k words 25 ch Complete 179 kudos

MerMay 2025 · Alternate Universe - Leviathantale (Undertale) · Alternative Universe - Megalodontale (Undertale) · Dreamtale Nightmare Sans (Undertale)· +10 more

Undertale (Video Game)

Trust us and dont cry

by ViaViv

Dust has messed up every single mission for the past month and generally has been hiding away alot. It's only a matter of time until Nightmare will want to get rid of him. Right?

Teen 2.1k words 1 ch Complete 111 kudos

Fluff · slight angst · Feel-good fluff · Dust isn't feeling well· +7 more