For a Year and a Day by Stephanie Sterling

Forced to face the grim reality of his mortality after he suffers a life-threatening injury, Ewan Cameron suddenly realizes that he needs a son. There is just one problem- he needs a wife first.

Ewan has never thought to marry and he's hardly a man to be tied down to one woman for the rest of his life. Luckily for him, the old Clan Cameron traditions offer the perfect solution: a handfasting. Ewan can have a year of marriage- long enough to sire his son- and then he and his wife can go their seperate ways.