This game is not GGGB and the developer is on the record stating with this game they're trying for something different than just repeat of their previous title. Again, you are choosing to ignore what they've actually said in favor of what you want.holly change stands for corrupted holly in the future there will be 2 versions for holly sweet/innocent like at the moment and corrupted
like in her old game good girl gone bad with the best friend that had 2 versions in the changed/corrupted version she would do all kind of dancing/cheating and slutty things that made logical sense for the corrupted/changed person to act that way
Even presuming for a moment for the sake of argument this "corrupted Holly" is something that will eventually make an appearance, she is nowhere near this point yet at this stage of the game. So your complaint she isn't already willing to lust after random dicks while in relationship is quite premature for her present character.