The title says it all! Hope you enjoy undertale belongs to Toby fox The Au's belongs to their respective owners and also the artist who made the fanart.

There are not enough of these out there. So, I decided to make one myself. Undertale sans and papyrus meet Underswap sans and papyrus. I do not own the cover art or Undertale. In here Frisk will be a girl. But if you want, change the Frisk parts of she to he. What happens when Underswap sans and papyrus are brought into Undertale? Find out. Also I really enjoy writing this story! ^.^ At first I was just going to have them have a quick chat, but then I wanted to develop a whole plot to this! Updates about every week or so.