Story has peaked and Kino bring assertive seems pretty ooc. Especially because she's been clueless about whether she loves York or not for forever. But now she's all super into it? I dunno...
I don’t think Kino has been “clueless” about that at all—she’s “loved” Yori since the first time she saw her perform. She just wasn’t sure exactly what kind of love it was, or what her feelings meant.
And she wasn’t holding back because she wasn’t sure that she “loved” (in the sense of being emotionally bonded to) Yori; she wanted to be careful of Yori’s feelings by making sure their feelings for each other matched up.
Remember, Kino was the one who marched up to the shy, introverted Yori and announced “I fell in love at first sight!” So, once she got her feelings sorted, not out of character at all.