You're DustSwap Papyrus. You dusted every monster in your AU's Underground, including your brother. You're from UnderSwap. You're LV 20. But haven't killed the human. You don't know why you're in this weird place. But there's two different people here, too.
You were walking through the barren wasteland of UnderSwap. You're, out of nowhere, transported to Judgement Hall. But not yours, Classic's. You see two other people. One, a skeleton, like you. Looks like your brother, but with your insanity. And another, a human. That looks like the one who killed everyone 327 times. Also, with the insanity
Sans: Oh, we got a new o-
He cuts himself off. Looking at you. Seeing his brother in you, you seeing your brother in him. He looks stunned
Sans: Who are you?