The Black Cat Prince (Miraculous LadyBug Royal AU)

King Gabriel is the ageing ruler of the Miraculous Kingdon is anxiously waiting for his son to produce an heir so he can take the throne. His son has three women in his harem, all of who have been unsuccessful in giving the future king a son or a daughter. Could this new girl that has been brought to the king as a token of forgiveness be the key to the succession of the kingdom?
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Prince Adrien was 23, successful in all military campaigns, loved by his people and had three "wives". Technically there were no weddings yet, weddings were only had once a child had been produced and a line could be secured for the kingdom. Then that "wife" became queen and the others could either remain unmarried or give to one of Prince Adrien's closest friends, those who could be trusted. The Prince began to wonder if he was at fault for the lack of an heir and not his "wives" after all he was Lord of the black cat, traditionally viewed as an unlucky animal. But his father refused to tell him anything about his family history, but Prince Adrien had heard rumours of the curse of the black cat... But his father had just been given another girl as a gift who is going to be his fourth "wife" could she be the one?
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Marinette should have grown up a Noble in the Miraculous Kingdon but her father and grandfather had a falling out when he fell in love with a woman her grandfather did not approve of his choice was simple family or the women. Her father chose her mother and was disowned. However thanks to the work of her grandmother, Marinette had spent time with her paternal grandparents and learned how to be a proper noble lady even if she preferred life as a village folk over the posh life she should have had. However, everything changed when her grandfather took her to offer as an apology gift for something he had done to the King. The King in turn offered her to his son Crowned Prince Adrien, who needed her to be the successful wife and why did the King take such an interest in her?