They were never meant to be sisters in the conventional sense. Different creatures. Different instincts. And yet when they found each other at the edge of something vast and unnamed, the recognition was immediate.

They chose each other before anyone chose them. And from that choice, they built something the world outside could not touch.

Over time the lines between them blurred in ways that defied explanation. Vesper would appear where Luna had just been standing. Luna would carry something in her eyes that felt unmistakably like Vesper. They learned to move in and out of each other so seamlessly that those watching could never be entirely certain which sister they were looking at.

Perhaps that is the point. Perhaps it always was.

The rest is not for everyone to know.