Stolen Thorn Bride by Kenley Davidson

Can a stubborn farm girl steal the heart of an elf king who has sworn never to love again?

After a century of war, the elves of Abreia are losing hope. Their greatest defender—Dechlan, king of the Northwatch—lies near death, and only a soul bond with a human bride can save him. The problem? No humans have set foot on elven lands for over a hundred years.
Kasia is no stranger to the fight for survival—she’s spent her life in the far northern reaches of Garimore, struggling to provide for her three siblings. When she’s captured by a trio of beautiful but terrifying elven warriors, her only thought is to return home, until they inform her she must marry their king… or be put to death.
Both Kasia and Dechlan are reluctant to accept their unwanted bond, until the elves’ ancient enemy rises up to threaten both their worlds. Kasia might just be the key to ending the war, but only if she is willing to sacrifice the life she’s always known.And only if Dechlan is willing to risk losing the bride he never expected, but is no longer certain he can live without.