In the King Sankyoudai no Kekkon series (キング三兄弟の結婚), also called the "Kings of Australia" series:

1. Shikumareta Wedding (仕組まれたウエディング; The Arranged Marriage):
   Alex King is the eldest grandson of a prestigious family. It's his duty to expand the King empire -- and he must also choose a bride and father a son!
   Gina Terlizzi already has a baby son -- she's not looking for a husband! No matter how breathless the chemistry between them, she's simply a guest in Alex's home to attend a wedding -- or is she the intended bride?

2. Hanayome ni Shinju wo (花嫁に真珠を; The Bridal Bargain):
   Powerful Antonio King is on hot coals, fighting not to mix business with pleasure with his new employee Hannah O'Neill. Yet when Hannah's past catches up with her and the risk of losing this intensely desirable woman stares him in the face, a passionate possessiveness drives him to an impulsive solution: marriage!

3. Yuuwaku no Honeymoon (誘惑のハネムーン; The Honeymoon Contract):
   Matteo King is the last unmarried grandson of the King dynasty -- and determined to stay that way! When a writer is hired to explore his family's history, Matt is shocked to realize the willowy redhead is a woman from his past... Nicole Redman is shaken to the core by the sexual energy between herself and Matt King -- and his belief she's a gold digger! So what has Matt ultimately got in mind when he insists they discuss the terms of her contract -- in the bedroom?
   (from fictiondb)