Sans is extremely depressed and in an effort to talk about it, Papyrus accidentally confuses his brother into thinking he reciprocated his romantic affection.
If you’re confused as to where the story is now, please check out the fanfic on AO3! Or, if you just need a quick refresher, the story is currently in early season 1 of the show. Sans and Papyrus, the two young skeleton brothers, lived a happy, peaceful life with their parents on the surface before the war. He’s really excited that the two of you get to share your first relationships with each other. However, when Chara/Frisk killed Sans, Papyrus was heartbroken and fell into a depression that only grew worse when they killed other monsters. Read to find out more! Underfell, a place where hell shows no bounds, and its kill, or be killed. Frisk Dreemurr is the main protagonist of the fanfiction story The Duelist of Mt. Sans can literally figure out exactly how many times he’s killed you by the look on your face.