No there is currently no confirmation on this. But even if it would come to that, it would be on a couple paths only! Choices matter in Pale Carnations. If you are going the "I am a nice guy" paths, you´ll get certain events and outcomes, if you go for the "I am an egomanical asshole" paths, you´ll get different events and outcomes of general events. Same goes for "I am neither good nor bad".Is there any confirmation as of today if Hana and/or Mina are going to get sexually involved with the club activities at some point in the future? I'd love to play the game but I don't want to get invested in those characters only for them to become sluts, eventually.
I mean, the dream sequences I saw could already be considered foreshadowing, but who knows.
I am rather sure you can get Hana and Mina involved in Club business in later updates, but that is on you then, if it happens. If you don´t want that to happen, you will get opportunity to prevent it. As said, it depends on how you play the game.