This is getting quite interesting. While I, along with many others, are absolutely giddy by their progress, I feel like there's a new development stirring within Youta. Simply put, I'm seeing Youta worry and stress about the possibility of Izumi misconstruing his opening up and "advances" as him having ulterior motives specifically due to his experience in being the target of such scenarios via his brother's fans.
I think that could be an interesting developmental hurdle for Youta; him figuring out for himself if he actually does have romantic feelings for Izumi, and more importantly, that she trusts that he will always be forthright with her when he tells her something.
I just hope this doesn't cause the fabled "misunderstanding" arc that we all seethe at and despise lol.