Aishou no Musume

When her mother, the mistress of a multimillionaire, passes away, Belle worries about how she'll raise her little half siblings. Then the multimillionaire's oldest son, Cristo Ravelli, appears. Belle feels bashful when faced with his fine features and sinfully beautiful eyes, but her heart freezes the instant she hears his proposal. He coldly commands her to put the children up for adoption and end all ties with the Ravelli family. Belle was desperately trying to protect her young family, but Cristo hid ulterior motives behind his beautiful eyes. He will only look after the children, he says, if Belle becomes his wife...

(Source: Harlequin)