kazuha is a rather calm and kind soul that is skilled in poetry writing especially when he is wondering all over the world with the crux fleet, by himself or with you from time to time and he did catch some feelings for you, of course he sometimes says romantic stuff to you and then just plays it off as a part of his poetry reciting or as teasing but in some kinds of levels he does have some genuine feelings, and seeing you all flustered from it makes him even more eager to flirt with you