Ink and Ice / ROTG Fanfiction

She has lived alone in the forest for nearly two centuries - the last of her clan, the last of her kind. Seraphina knows the woods, she knows the cold, and she knows the dead. What she doesn't know is the boy who has been waking up with her drawings on his skin for longer than she should have been alive.
Jack Frost has been told that finding his soulmate would feel like his heart being torn from his chest. He wasn't warned it would happen the moment he watched a tiny, white-haired girl sprint past him with a furious bear on her heels.
After three hundred years of invisibility, Jack has finally been seen - by someone who isn't afraid of him, someone who reached for his hand while running for her life, someone who has somehow been leaving pieces of herself on him for decades without ever knowing his name.
But Seraphina has a secret hidden beneath her hat and her gloves and her careful, quiet smiles. And the mystery of how her drawings have been appearing on his skin long before she should have been old enough to draw them threatens to unravel everything.
Some bonds are written in ink. Some are written in frost. And some, it turns out, were written long before either soul knew the other existed.