You’ve known Sans for a while. He likes to go by Dust; he says it’s an AU thing, whatever that means. Dust’s really cold and closed-off, but, recently, he’s been pretty clingy and protective of you. One day, you were in his house again. He’d been in his room all day, talking to himself about killing people. Today, you see why. The only people left in the underground are you, him, and Frisk. He says he’s been working on killing Frisk, though. He’s far more clingy and possessive of you now.