What exactly does "the girls can also interact with you" mean? If you don’t give them enough attention, they’ll tie the player up instead, play with them etc?
If you do not play with them, they will ask you after a while. (if you are close to them) Or they just use the machines to satisfy themselves (if you placed some) At best you put them into chastity devices (belt and bra) and then let some time pass by. (it is a random event)
