Thanks for the kind words! There's indeed a second game coming out, a new episode was just released today, find out more about it here.
The relationships with the main girls are established fairly early in the game, in the case of Mrs. Smith you need to investigate her workplace and successfully complete the test at Discreet. As for Liza, you need to deal with her boyfriend (take a job at the supermarket), take her out to dinner and generally be nice to her.