The Moonspell - Book 2 Destin's Sacrifice For Love by Charles Cole

At the end of the Middle Ages, in a small fishing village in Norway, a young woman is in horror when a love spell she cast bounces back, making her become a beast every full moon.  To make matters worse she has found the love of her life, Destin, a strong, courageous man that is not easily startled.  Meanwhile an old mystic by the name of Nann is trying to distance herself from the evils of spell casting, and the disapproval of townsfolk.  As much as she tries, it follows her in her daily life.