The Billionaire In Penthouse B by Anna Depalo

A rich, powerful loner, Gage fit the description of the man who may have information about the mysterious demise of Jacinda Endicott's sister. Which was why Jacinda had abandoned her old life and taken a job at Gage's penthouse as his live–in maid. By day, she snooped for clues about her employer; by night, she fought her fatal attraction to the sexy, secretive billionaire. Her heart told her Gage was innocent; her head warned her otherwise. Which would she listen to?

The Tycoon's Pregnant Mistress by Maya Banks

Greek hotel magnate Chrysander Anetakis's former mistress was pregnant? And had amnesia? That meant Marley Jameson didn't remember betraying him by selling company secrets. Or that he'd thrown her out of his life. So he told her a little white lie: they were engaged. Then swept her away to his Greek island to await the birth of his baby and enjoy her sudden devotion... before tossing her out. But he didn't count on Marley regaining her memory so soon...