Thinking about the possibilities and all the interactions between Killer and Something New!Papyrus, about how strange it’d be to be physically there with your brother and yet he is hardly actually there. His body is there, sure, but it is as changed as his SOUL, as his mind and his personality and his identity.
Sometimes you see brief glimpses of your brother, of the Sans you know, looking back at you from a single blazing eye light inside a pair of lifeless, empty eyes. The vague familiar shape of a SOUL unnaturally outside his body, the glinting white.
Sans is looking at you from behind someone else’s eyes, but then you say or do something and suddenly your brother is gone as if he was never there. A mere ghost, a trick of the eye, as this new version of Sans—Killer, his name is Killer, a name Sans wouldn’t have chosen—pulls away from you and any reminders of who he was.
The one who calls you “bro” but says it in such an empty, callous way that it’s clear that you are no brother to him—that the word doesn’t mean a thing to him. That maybe he doesn’t even remember what it feels like to have a brother, a family.
And then you’re left with nothing but memories to comb over, trying to figure out when exactly you watched the life bleed out of your brother and never noticed until it was far too late to prevent someone else from being born from his dust and parade around in his corpse.