Straw & Gold (A Realm of Revelry) by Chelsey Ann Tompkins

Some names hold power. Some love stories demand a price. For thirteen years, the Ravenfae Princess Morella has been bound by a marriage contract to the distant and powerful King Killian. She could have broken the agreement at any time, but Morella has her reasons. Only Killian possesses the magic strong enough to save her brother’s wife from the fleeting lifespan of a human. So she journeys to his kingdom, determined to secure a happy ending for everyone—including herself. But her new husband is cold, distant, and avoids Morella at all costs until the day he uncovers her true heritage as she spins straw into golden thread. With this new discovery, Killian strikes a bargain: If Morella can uncover Killian’s true name over the next three months, he will use his power to transform her brother's wife into fae. The deeper Morella digs, the closer she and Killian become—until their heated whispers turn into passionate nights. And when the darkest truth of the bargain is finally revealed, Morella understands the depth of the role she has to play in saving the husband she has come to love. Read more