I think we all can predict this. Nanao will eventually confess that nothing happened that night, he just wanted to stir up the misunderstanding and he might talk to Noah again to clear things up (hopefully they don't end up together).
It's bcs he has an inferiority complex toward alphonso and he thought she wad alphonso's woman and wanted jer bcs for him it was a showcase of his win same reason why he is into ariandes in this life. It's bcs al lobes her
Nah please be afraid. Don't let your guards down just because he was being nice to you a little