Oblivion

After a devastating war that wiped out almost her entire Kingdom, Princess Lilith Winters is married off to the man responsible, a Prince from the neighboring empire of Elysia. The Crown Prince originally has no interest in falling in love with her, but after two years of secret mistresses, no heirs, and Lilith's almost obsessive feelings, Leo finally lets his guard down and allows her into his heart. However, the feeling of not wanting to create a heir with Lilith persists and he continues to indulge in a plethora of other women, up until he starts to see the High Priestess in a different way.