Geno: drunk noises

Classic: "Heya. Welcome. Everyone here is unhappy, drunk, or unaware"

Science sans: is talking underfell

Underfell sans: is talking to science sans

Swapsans: is talking to someone in the other room

Underfell papyrus: is talking with underswap papyrus

Underswap papyrus: is talking to underfell

(This is the chrimas party au)