October 2: On this day in Pen Pal

On this day in Pen Pal, Kaya wrote to Em and told her it was too dangerous to continue the correspondence--from this point, the story enters a new stage. There won't be more posts between now and the day the story ends, but at the end I have an idea for a special post. And I might post something between then and now, if something occurs to me.

Meanwhile, here are neither lava nor waves, and yet it might be both: