[He nods along slowly to the explanation, to that inkling of suspicion but going along with it that had apparently underlined the sharing of cookies, back then. It's not an answer to what's happening or why, it's not a guarantee that something worse isn't coming. But it's one of his worst fears reasonably addressed, a relief from fear that gives him extra processing power for noting the hints of a downward trend in what he can pick up of his brother's feelings and thoughts.]
You're apologizing for the maze? [There is no convincingly pretending that he misunderstands Sans's meaning, not when they're leaking feelings like this. But he pretends anyway, as if Sans's notion that this isn't fair to Papyrus means he has free rein to decide what's happening in the conversation.] If that's the kind of thing we feel like doing, I have ideas for improvement!
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You're apologizing for the maze? [There is no convincingly pretending that he misunderstands Sans's meaning, not when they're leaking feelings like this. But he pretends anyway, as if Sans's notion that this isn't fair to Papyrus means he has free rein to decide what's happening in the conversation.] If that's the kind of thing we feel like doing, I have ideas for improvement!