Sunshine by Robin McKinley

They took her clothes and sneakers. They dressed her in a long red gown. And they shackled her to the wall of an abandoned mansion-within easy reach of a figure stirring in the moonlight.

She knows that it is a vampire.

She knows that she's to be his dinner, and that when he is finished with her, she will be dead. Yet, when light breaks, she finds that he has not attempted to harm her. And now it is he who needs her to help him survive the day...

Hardcover Info: ISBN 0425191788, Berkley Publishing Group, 2003