Do 당신 think Kovu will treet Simba as a real father, and tell him what on his mind and ask him for advice?

Yes. Simba is his father-in-law and they're usually taken as sort of father-figures if they have any potential as such. And Simba does. While Kovu has never had a father so even someone as 로스트 as Simba is better than no one.