Shadow

An orphan girl is running in a forest, when she trips, and is captured by a figure in a cloak.
When she wakes up she is greeted by a creature like a shadow, with eyes like round light bulbs, razer sharp teeth, and a gentle smile.

"Human is precious. Human is fragile." the creature says after putting it's forehead against her forehead and all she can do is sit wide eyes till the creature moves back smiles and then leaves her alone in the room trying to process it.
What shocks the girl more is her new personal servant telling her no one in the castle knows the creatures name, they all just call him Master or Sir, she's also told the creature is intelligent and his speech pattern will get better the more he trusts her.