Alternate Universe - Underswap FanFiction

City Birds

City Birds

F/F
F/M
M/M
G
Updated
13.04.2025
Fandom
Undertale (Video Game)
Characters
Papyrus (Underswap), Alphys/Undyne (Underswap), Asgore Dreemurr & Toriel (underswap), sans/OC, alphys (underswap), Undyne (Underswap), Toriel (Underswap), Asgore (Underswap), Frisk (Underswap), Chara (underswap), Aurelia (OC), Crystal (oc),
Tags
Other Additional Tags to Be Added Eventual Smut Tags May Change yeet superhero eventuall fluff angst? maybe? Probably I might include an nsfw chapter I will provide illustrations in deviantart eventually what is my life Alternate Universe - Underswap
A young girl has taken on the profile of a modern day superhero with prosthetic wings. Will Sans find out who she is before it's too late and she gets herself into deep trouble?
A Picture Is Worth A Thousand Words

A Picture Is Worth A Thousand Words

F/F
F/M
M/M
Other
G
Updated
13.04.2025
Fandom
Undertale (Video Game)
Characters
Other Character Tags to Be Added, Other Relationship Tags to Be Added, Reader, Sans, Papyrus, Frisk, Toriel, Alphys, Undyne, Sans/Reader, Toriel/Asgore, Alphys/Undyne,
Tags
Other Additional Tags to Be Added Alternate Universe - Underswap Alternate Universe - Underfell Alternate Universe - PTA Sans Alternate Universe - mafiatale Alternate Universe - Errortale Alternate Universe - Outertale
Sans/Reader undertale oneshots, each one using a different prompt/starter found on tumblr. I currently have 1500+ sitting in my computer, waiting for use.None are connected unless explicitly stated as such. Each oneshot ranges in length, rating, and...