Claiming the Royal Innocent (Kingdoms & Crowns);

Found 

When Aleksandra Dimitriou is revealed as the secret daughter of Akathinia's former king, she's torn from her comfortable existence and thrust into the royal world…under the protection of Aristos Nicolades. 

Forbidden 

Aristos has orders not to touch the innocent princess, but beautiful Aleksandra calls to the rebellious urges that the self-made Greek tycoon thought he overcame long ago. 

Forever? 

As the heat of their desire rises, the rules begin to evaporate. It's soon clear that the person Aristos should be protecting Aleksandra from is himself!