Viciously Yours by Jamie Applegate Hunter — book slip

Rennick, the heir to the Mountain Kingdom, has known since he was thirteen that his fated mate is a human girl named Amelia. Bound by magic to his kingdom, he could only send her letters and gifts from afar.

But as his twenty-fifth birthday approaches, he crosses the barrier to claim her. Amelia, who has received mysterious letters and gifts from a fae boy since she was thirteen, has fallen in love with her unseen admirer.

On her twenty-fifth birthday, she finally meets him, and their fated connection is undeniable.

First in the Fae Kings of Eden series. For fans of A Court of Thorns and Roses and Twilight.