Don't ask where I got the idea... I just learned about Error Sans and I've always loved Aftertale Sans. I instantly fall in love with every Undertale AU, even UnderFell. Most art of it is just creepy. I'll do more Sans au ships if wanted. For example; Sans x Underfell Sans Swaptale Sans x Sans Error Sans x Underfell Sans Error Sans x Swaptale Sans Sans x Aftertale Sans Gaster Sans x Sans Aftertale Sans x Underfell Sans Gaster Sans x Underfell Sans Gaster Sans x Error Sans

...I'm Undertale trash. This is basically going to be the story of Undertale retold as the Underfell version. I'm sure something like this exists already...but whatever. The story is told from Frisk's point of view, and it's the Pacifist version because Genocide scares me. Anyways I hope you like it!