@RonBWL Point is Nagi doesn't freak out over things the girls do that are even remotely sexual or shows some skin. Even other series where the girls are basically throwing themselves at the guy and openly stating they like him they freak out.
Even in this one he has already won the girl and things would be so much smoother for him if he just acted normal. Hell he most likely already be having sex with her considering how she acts. Though of course this is a comedy so that can't happen.