Please do Correct me, But I just Dont Think There is Any Reason For Hirano to Actually Fell for Kagi Right Away, at least for now
Unlike miyano to sasaki whereas He is Looking up for Him but also Has Him as his BL loving Friends, he also Already REALLLY Used to the idea Of Men x Men Idea.
Whilst Hirano Here, He I assumed Is Not, Maybe He could be a Denial, but for now he's just In a very good term with kagi and just dont have any Romance feeling towards him.
I just dont get the inner workings of Hiranos Head. I wished The Manga wont just steal idea from Sasamiya which would make it Booring