>>713502058
I wish this was datamined or something, since this spreadsheet tested via fishing only accounts for Kaguya and Pilika/Murasame.
https://docs.google.com/spreadsheets/d/1GDTyqodVA9GvaZ4awMzd6mv0vgaNfFKoObSffmkL7hQ/edit?usp=sharing
And there's apparently trio dialogue too, one between Sakaki, Suzu, and Iroha.

I personally got one with Watarase and Tsubame, and think maybe villager dialogue on everyone's birthday may be a clue as to who interacts with what.