Before reading the fic, look at Snowdrop, the animation made ​​by SillyFillyStudios.
Otherwise you will not understand some things.

Snowdrop goes home, when the night has already fallen. So, while she waits her mother, curled up in the covers of her bed, her mother began to be late.
Her father working late at night, then she decided to still wait, but she gradually begins to fall asleep.
The sound of hoofsteps on the stairs wake her up, her mother is finally back, to her great delight. That's what she thought, at first...