LOOKING FOR ANOTHER MANGA

Hey !!
I'm looking for a manga where the girl meets a cat in her dreams (or something like that) Afterwards he and his loyal servant change the minds of the people around her to let them think their brother en sister. The boy wants to marry the girl but he first have to find all his brother because he doesn't want to become king. His servant is helping him. The servant is really good with magic. After a while the girl and the servant realise that they love each other and then the story goes on and on.

Thanks for providing me with the title
(=・ω・=)