Well, it's good for you! It's not like you're using any muscles smiling all the time. [Because, again, he does not even have any muscles. Papyrus is closer to having muscles than Sans, with all the parts for making his limbs move - physical pistons, actuators, servos, and so on, instead of outright magic.
Papyrus moves out to the door and past it, pausing just out of sight of the eyes - he can still feel Sans seeing him with his more physical eyes, but something changes. Enough that he doesn't want to get too far ahead, when Sans finally leaves his own line of sight.]
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Papyrus moves out to the door and past it, pausing just out of sight of the eyes - he can still feel Sans seeing him with his more physical eyes, but something changes. Enough that he doesn't want to get too far ahead, when Sans finally leaves his own line of sight.]