[Erwin can feel Papyrus thaw out a little at the mention of his brother, and so when he starts laughing, Erwin joins in. He is... very glad he doesn't live on Loomis Drive right now.]

Well then, since we're here anyway, perhaps we can find some more decorations for your tree? Just in case Sans brings home more lights to try and compete.

[Erwin Smith: completely not above fanning the flames of sibling rivalry. For someone who was an only child, there's a real streak of little brother in him.]