Bonded by Thorns

When her father is imprisoned in an enchanted fae realm, a young woman trades her own freedom for his and finds herself held captive by four fae princes who transform into beasts at night. To win her release, she bargains to help the princes find their mates and break a curse that binds them. As she grows closer to the princes—each with a distinct temperament—she becomes entangled in the fate of their realm, which is threatened by a rival who seeks to seize its magic. The first book in the Beasts of the Briar series, it is a Beauty and the Beast-inspired romantasy with a why-choose/reverse harem romance.