Twin Sheiks?

Sheik Hassan Rashid had no intention of marrying a Western woman. Until his irresponsible twin skipped town and he found himself engaged to Kali Whitman his brothers fiancée. Hassan intender to masquerade as his twin only long enough to make Kali call off the wedding...

But that was the last thing Kali had planned! Oh, she knew Hassan wasn't the brother she'd agreed to marry--because his kisses aroused an all-consuming desire she'd never felt before. She loved Hassan's gallantry in sparing her feelings. Still this sheik's secret would have to come out soon. And before it did, Kali had a plan for turning his honorable deed into a lifetime commitment...