Basically you choose to be the good guy and genuinely help the girls or be the bad guy and molest them while they sleep or drug their drinks to make them fall asleep and molest them.
There's a bit of romance with the girls. For example, with the grandmother it seems if you are the good guy there can be genuine romance, with the sister more or less (for some reason she hates you but secretly has a crush on you, typical big sister trope), a newbie prostitute has two clear routes, corruption and romance. Her romance route is pretty cute, I must say.
There are touches of romance, but for now it's not the main focus. There is much more content being the night molester than the white knight. But, I hope this can change and we'll have decent content if we choose to be a decent human being. lol