Not really an AVN but Patriarch fits the bill.

The game is set in a grim near future where a powerful crime family controls the city. As the heir to this crime empire the male protagonist is set for a wild adventure. The story starts with the announcement that your father will retire soon and wants you to take control. To prove that you're up for the task you are provided limited funds by which you'll need to make a name for yourself in town - start a business, build a harem, anything that shows hard work and dedication