Frisk's smile is like sunshine, and Chara's own smile warms from it. It's a nice moment. It reminds them that even after everything that's happened, Frisk is still Frisk.

Chara's eyes slide off to the side. "Hey, Frisk." There's something they need to say, and now's the best time for it. They're calm and not about to melt down or scream at anyone. How often does this happen?

"Um." They hold on to their lingering mood, but can't help but feel that it's being too dismissive. They let it go a little more, concentrating on sounding sincere. "I'm really sorry about earlier." More solemnity. "That was... I went a little nuts, there, I guess." Ha ha. 'Nuts', like some slapstick cartoon. They made Frisk cry, and it's the most unfunny thing they can think of.

"I shouldn't have..."

It's been an entire progression, and by now they're looking down.