A doll and witch at the end of the world.
There aren't that many entities left. Most have chosen to move on. Eternity is impossible to enjoy forever after all: one has all of eternity to tire of it.
It's cold. A much more somber end to civilization than ever they expected.
Not war. Not famine. Not pestilence.
But apathy. Resignation...
Boredom.
After all. Time weighs heavy when an entity has lived longer than 128 bit computers can count.
The witch and doll will return to their own time soon enough.
But it's still an experience.
A reminder.