the water's call of anger

Naruto is a mermaid prince form the sea, with both of his parents and family dead form the great sea war. Naruto is the olny one left form his bloodline and must have a child ready for the throne, he is given the choice to escape the sea water's in secret and go to the surface and marry a human, or marry old king tofo and become his wife.

Sasuke's a prince form the surface and is unable to feel love for anyone who's not blood related, he is of age and must get married to a female or male as long as he is able to feel love for that person. if he does not find love and the end of his 30th brithday, the prophecy will come true and he will be forever Alone for the rest of his life.

how will they fall in love?