Forbidden to the Desert Prince
Series: The Royal Desert Legacy
Publisher: Harlequin Enterprises ULC; Harlequin Presents
Published: 2022
Language: eng
ISBN-13: 9781335738899
First sentence: Run.  

  ARIEL HART STARED at the text message on her phone. For just one breath.  

  Then she sprang into action. She had known this moment could come. She’d known to be prepared for it.
Description: The wrong royal brother? Or her soul mate? 
She was promised to one man…  But has always desired another!
Ariel Hart thought she was free from her arranged marriage to the sheikh. But fifteen years after a coup deposed the royal family, Prince Cairo, her betrothed’s brother, appears…demanding she uphold the bargain!
Cairo’s allegiance to his brother is his driving force. If the sheikh wants his promised bride, Cairo will deliver her. But the forbidden desire between them threatens everything. Her plans, his honor, the future of a nation. Can they resist a need that burns hotter than the desert sun?  

The Royal Desert Legacy - Maisey Yates
Book 1: ♡Forbidden to the desert Prince (Cairo al Hadid & Ariel Hart)
Book 2. ☆Virgin for the Desert King (Riyaz al Hadid & Brianna Whitman)
(I read half of book#2 first, it just made more sense)