Lusting for the Highlander by Lydia Kendall

While running away from her demons, she put a spell on him…
Falsely accused of being a witch, Morgana Taylor is doomed to live on the run. In an attempt to escape a terrible fate at the hands of a vicious man, she finds herself under the protection of a captivating Highlander.

Having lost both his wife and unborn child, Gregor Reid, Laird of Henwen, has dedicated his life to his people. Until he meets Morgana. Mesmerized by her eloquence, modesty, and abilities, he falls passionately in love with her.
When Morgana’s huntsman finds a way to imprison her, Gregor is haunted by his failure to protect her. With his time running short, he will have to enlist every ounce of his wit and bravery: the only way to save the woman he loves from the pyre is to uncover the witch hunter’s darkest secret.