Will in the meantime Raven will actually sign the real stoybook of legends and will thy eventually get together with Dexter?

あなた really need to watch the"Way Too Wonderland"special.This special gave an end to the "royal または rebel"struggle.(I won't say anything もっと見る because I don't want to put any spoilers)
As for Raven and デクスター 〜警察官は殺人鬼 they already dated each other in the episode"Date Night".

Raven does sign the book but using what I know Raven and デクスター 〜警察官は殺人鬼 are not a thimg.