WInter Kingdom(Soredemo Sekai wa utsukushii)

(I know in the anime, Livius is 12, but in my story he is going to be 15, also Nike is deceased, murdered actually)

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After Nike's death, Livius became even more cold and cruel,shutting himself up. He only confides in Neil(like he always did). In his rampage, he sets out to destroy tha Winter Kingdom, since Nike's killer was from the winter kingdom. In older to stop him from doing so, the king sends his daughter, Yukimi, to marry the sun king. Livius doesn't accept Yukimi at first, but grows fond of her and starts to love her. He becomes extremely overprotective of her and jealous when Bard or anyone else flirts with her. He often argues with her. How will this turn out?