Everyone hyped about Itsuki getting kissed by Fuutarou but all I see is a real character development arc.
While it was sudden, at least they finally dealt with their "biological father" of a failure.
That's what matters here.
Suddenly reappearing and telling your daughter how they should live their life as if you know them better is the most outlandish dickish move that bald guy has ever done.
The Nakanos have full rights to disown him and I support them.