Fujo(shi?) lowkey has a man-boner for Sakurai. Imagine if he realized that his daughter has a crush on him, and he's upset because he realized he can't bone Sakurai.
It's weird that they haven't pieced it together. I know that they're not the brightest bunch, but with the amount of hints dropped, you'd think...
Then again, he doesn't know Hana's last name so it doesn't give away the twist that they're related