Merking(reincarnation kasa?) AU!

Story.

When rui was observing human, then there is a kid, a prince that see him, it was tsukasa, that time rui was still 1000 years or we can say just 10 years, he still a kid that time.. and when he see tsukasa he go away but tsukasa want to see him he was so excited seeing something strange but new, and rui get his brave to meet tsukasa. Surprisingly tsukasa was so kind and they become friends, they always hang out there everynight and talking about everything like what kids do. Until someday the maid found him and see him as a monster that will attack the prince. He already fell in love with tsukasa at the first time he see his smile but he don't know what he feel and he dont know what is love after all, he just think maybe he just excited get a human friend.

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