le plot:
Spoilers for Undertale (duh) and also a bit of Deltarune
This takes place in a neutral timeline, where Papyrus is killed by the player. In the original game, Sans seemingly hates the player for it, but never breaks his promise to Toriel. In this timeline however, Flowey confronts Sans and uses the power of a Shadow Crystal to show Sans previous timelines, and all the monsters you killed in these other timelines. Sans decides that something needs to be done, and meets the player at MTT resort, to discuss his newly learned knowledge. Sans talks with the player, the date goes on mostly the same way it does normally, until he brings up what Flowey showed him. He talks a bit about how he doesn't know what to think, and asking if you really even are a human. Sans initiates a fight, it's similar to Papyrus' fight, but more fast paced and trickier patterns, but not as fast or complex as the Genocide Sans fight. He notably doesn't use Gaster Blasters for most of the fight (he uses it as his "special attack"), and makes allusions to things said by himself in other timelines. The fight goes on, as does the date, Sans is defeated by talking (you cannot fight in this battle, Sans accidentally breaks the button with a chicken bone), and the fight is split into multiple, short, increasingly intense phases, having food based attacks that act as intervals between these phases, which are based off multiple course meal items. The fight ends with a big final attack, similar to Sans's final attack from Genocide, it ends with Sans having you trapped and ready to hit you with blasters, but stopping, not being able to bring himself to do it. Sans ends the battle and goes on a schpeal about how he made a promise and he's not gonna break it. Sans walks away and tells the player not to come back to snowdin.
"If we really are friends, you won't come back."
Sans doesn't show up in the last corridor, or anywhere else after the fight, and doesn't call the player after omega flowey is beaten.
that's all blehhh
