Ok so this Undertale is where abunch of undertale monsters got turned into mimics right? Sans is one of the survived ones but a parasite is able to mimic him based on his popularity and the fact that so many reseted timelines overlayed onto one of another, it resulted in dust from previous timelines to be in the underground, which a parasite took and mimics sans now. This is the sans mimic, the real sans is in papyrus's house, along with the real papyrus being a survivor too, the 2 are hiding, until a human falls onto earth, these mimics can't be spared btw. Also sans and papyrus can NOT be infected due to being skeletons, they have no flesh to feed on. Anyways more lore is to be added soon!
Parasite-sans/MIMIC SANS. !-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-! PHASE 1 btw.