Harlequin Presents Extra Series by Susan Stephens

Sheikh Khalifa is bored by the potential wives paraded in front of him. So when he catches sweet, innocent Beth Torrance trespassing on his private beach, he is more than ready to be distracted....Beth comes to the island a naive virgin, but leaves an awakened woman--and unknowingly pregnant with the sheikh's baby When the desert king vows to claim his child--and take its mother as his permanent mistress--Beth is powerless to refuse a royal decree

Crown Prince Alessandro Bussoni Ferara needs to make a purely practical marriage and he's found the perfect bride! Emily Weston agrees to the prince's proposal. But once Alessandro's wedding ring is on her finger, it's revealed that Alessandro must provide the principality of Ferara with an heir. Heartbroken to find she's just a bride of convenience, Emily decides she must leave Ferara and Alessandro without telling him she's expecting his baby .