Hmmm... [To the claim of 'regular brother weirdness', Papyrus offers only a polite but clearly skeptical sound. Sans being so diligent about cleaning them, low effort and discomfort or not, is still weird for his brother! Laundry and making the bed are low effort too, and look how he does with that. Irregular brother weirdness is the best he'll offer.
But past that, as Sans starts theorizing, Papyrus mentally pulls up a digital calendar. Highlights the spans of time when they noticed oddness, and changes - even if only in retrospect. Sure enough, Sans was right. As he usually is, when he takes things seriously enough! His brother's reliable like that. Papyrus texts Sans a link to the digital calendar as he nods.] Holidays, or pre-holidays. And today's supposed to be a holiday about love...? [Romantic, friendly, and familial, they've already established. Halloween had ghosts, Thanksgiving bafflingly gave what he was thankful for away...]
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But past that, as Sans starts theorizing, Papyrus mentally pulls up a digital calendar. Highlights the spans of time when they noticed oddness, and changes - even if only in retrospect. Sure enough, Sans was right. As he usually is, when he takes things seriously enough! His brother's reliable like that. Papyrus texts Sans a link to the digital calendar as he nods.] Holidays, or pre-holidays. And today's supposed to be a holiday about love...? [Romantic, friendly, and familial, they've already established. Halloween had ghosts, Thanksgiving bafflingly gave what he was thankful for away...]