In another time or place, the compliments and attentiveness to his lecture might be heartwarming. But this is just wave after wave of disappointment. His face falls as soon as the visor comes off, partly because he'd hoped Tyki was wrong about how important the visors were to this control, partly because he's not happy to hear she wants nothing to do with improving herself as a person... but mostly because, it was easier to have this conversation when he couldn't properly see his brother's face.

So Papyrus recoils from the reaching hand and the eyes staring at him in some unrecognizable affection, and takes a step back before catching himself.

"Because... You're not close. You're right here, but you don't understand. I want my brother back. Do you... Do you have any family? Any friends?"

Is she like the Prince, kidnapping people to have some company, but succeeding in changing them to be something more beautiful after watching their hopes and suffering? Or is removing that weakness... really all she cares about? It seems lonely.