Kageyama is someone impatient, he always has been - still, he's a good person. Deep down. Way deep down. What mostly stops him from wanting and admitting that he likes you is the damn fact that you're from the Tsukishima family; if he wants to be with you, his brother-in-law will be Kei Tsukishima - he hates Kei Tsukishima! But you are a Tsukishima, Kageyama simply hates all of it. Everything.