Norroway. Book 1, The Black Bull of Norroway

"Sibylla is a young woman who's always craved adventure. So when a witch tells of a rather unusual betrothal in her future, she takes it well in stride. But she never guessed that the prophecy would be quite so literal, until the day a giant, magical bull appears at her door to ask for her hand in marriage. But the real question is: is the Black Bull of Norroway a man, or a monster?"--