Mask of the Highlander by Bambi Lynn

Once she was afraid to touch him. Now she’s afraid to let go.

Forced to marry to avoid war between clans, Kenna Cleary endured three days of her new husband’s painful brutality, unaware of his demon heritage. Leaving her for dead, he rode off to battle the English. In the five years of his absence, she bore him a daughter, increased his holdings, and gained the love and respect of his people. Now he’s home. Must she and the clan learn to endure his cruelty once more?

Can an ancient Celtic god find peace in the mortal world?

The Laird of Domhnul has returned from war a changed man–moreso than his wife can possibly know. Now the warrior faces a new battle, one for his wife’s heart, and his peoples’ trust. He must walk the knife’s edge of deception and danger, all while learning to manage the supernatural power flaring inside him and discovering a heritage he never imagined.
But when his father embroils them in a deadly plot, can the couple find a way to prevent war between the clans?