The Sheikh's Contract Bride: Harlequin comics

Beth would do anything for her twin sister, Addie, who has been betrothed to a sheikh from young age and has led a life of high expectation and heavy responsibility. Beth, unlike her sister, spent a lonesome childhood receiving little attention from her parents. The twins have grown up trusting and depending on each other. As the day of meeting the sheikh nears, Addie confides in Beth with her secret love for another man. To save her dearest Addie, Beth decides to go to the desert kingdom of Bha'Khar, pretending to be her twin sister!