Jennifer Armentrout Blood and Ash Cycle. From Blood and Ashes Book

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Penellafi Balfour, also known as Makivka, is not just the orphaned daughter of wealthy individuals close to the royal family; she's also a Virgin. Virgins are prepared for an important religious ritual for years, deeply respected, and zealously protected. Thus, Makivka grew up in luxury but lacked personal freedom. She is bound by strict rules, but she secretly breaks all of them: she learns martial arts, helps those less fortunate, and sneaks out for walks in the city and more. During one of these walks, Makivka, hiding behind a mask, meets a handsome stranger. He mistakes her for the servant he has an appointment with—a forbidden pleasure that Virgins can't even dream of. Soon, this handsome stranger finds himself in the castle where Makivka lives, becoming... her new personal protector. The girl is, of course, shocked. However, this is just the beginning of incredible adventures that make her question almost everything she knows about humanity.