She's about to respond to his offer, feeling that uncertainty that also wants to say yes even as she's afraid that saying yes makes her a burden on someone else, when the rain starts.

And he's being too kind, holding out his cape over her head. It makes her feel briefly guilty, because the rain cloud's only here due to her affiliation. One she hadn't known about before the weird element things had started happening.

"I'm raining. There are four elemental gods here, you know? It turns out the one I'm claimed by is Maris-sama. He's water." Her smile is small and self-aware; she finds her admission a little bit funny. What other element would she be? "Not that long ago people like us started finding weird things happening around us. Water people had it rain, fire people are lighting things on fire, earth people are making things bloom... stuff like that. So um, I'm sorry. I'm why the rain's just happening right here. You'll get wet if you stay too close."

He is, in fact, already getting wet, but it's a refreshing enough reaction (most often people have just gotten the heck out of the way) that she doesn't do the polite thing and move away again.