@Adrian_V, there is a lot to work with in regards to Kaguya family, she is a Shinomiya in case people forgot.
There is at least material for 3 volumes just dealing on how her father deals with it if he does approve of the relationship, Ishigami been a side attraction to delay what will happen when Kaguya relationship with Miyuki is revealed ... not to say about the Shirogane family since her mother havent shown up and that is another subject that been left hanging.
1. That is one the hardest friendzone moments I've seen in any story
2. I forget who said this but it was something along the lines of "If you are going to break someone's heart the least you can do is let them forsake you."