Castaldini Crown Series by Olivia Gates

At Her Royal Ex-Lover's Command He would have been king of Castaldini...until scandal sent Prince Leandro D'Agostino into exile. Now Phoebe Alexander, his secret lover who'd refused to leave with him, had come to convince him to accept his rightful crown. But the pain of betrayal still coursed through Leandro's veins. He would rule only if Phoebe bowed to his wishes. Scorched from the decisions of her past, Phoebe was willing to do Leandro's royal bidding... moreAt Her Royal Ex-Lover's Command He would have been king of Castaldini...until scandal sent Prince Leandro D'Agostino into exile. Now Phoebe Alexander, his secret lover who'd refused to leave with him, had come to convince him to accept his rightful crown. But the pain of betrayal still coursed through Leandro's veins. He would rule only if Phoebe bowed to his wishes. Scorched from the decisions of her past, Phoebe was willing to do Leandro's royal bidding. She knew she could never be his queen, but she would freely become the prince's lover. Then an unexpected pregnancy changed everything. less

"$100,000 for an hour of your time." As one of the world's most powerful men, Prince Durante D'Agostino often received inappropriate offers. Yet the woman attached to this one stole the breath from his body. He had no interest in discussing business--until he learned she'd come to bring the prodigal prince back to Castaldini to become its future king. Seducing the messenger wasn't supposed to be part of the bargain... more"$100,000 for an hour of your time." As one of the world's most powerful men, Prince Durante D'Agostino often received inappropriate offers. Yet the woman attached to this one stole the breath from his body. He had no interest in discussing business--until he learned she'd come to bring the prodigal prince back to Castaldini to become its future king. Seducing the messenger wasn't supposed to be part of the bargain. But after one fiery night, Durante knew Gabrielle was meant to rule by his side. Until he discovered her true identity--and the betrayal launched his scheme for a most royal revenge. less

At the Future King's Mercy Once, she'd scorned him. And illegitimate secret prince Ferruccio Selvaggio had sworn he would make her pay. Now, Princess Clarissa D'Agostino was in his power. It was time to teach her a lesson.... The future of the kingdom rested on her. Clarissa knew she had to do whatever it took to convince Ferruccio to accept the crown and save them all. Even if it meant marrying a man who believed the worst of her. Even if it meant giving him her heart.