Bound to the Shadow Prince by Ruby Dixon

In brand new condition, never read. In order to protect her kingdom from the wrath of a vengeful goddess, Princess Candra must remain locked inside a tower for seven years. Seven long years without a friend—or a lover—by her side. And shut inside the tower with her? A Fellian, the enemy of her people, a fearsome warrior race complete with wings and claws and fangs. Nemeth is terrifying, cruel, and disturbingly magnetic. Candra should kill him for his supplies, but she’s desperate for his company…and his touch. As time inside the unchanging tower rolls on, Candra uncovers the man behind the stony facade. And when their tenure hits an unexpected snag, Candra and Nemeth are forced to make a difficult choice. They’ll need to face an outside world they no longer recognize, one that threatens their lives and their surprising love.