Push the slum fare goon aside, come back a day later: do not pay and accept 'grunt' work, go to Cassie and check on her a day later.
Fawn, and Arlene, is required for this: optionals are Sammy, and LinLin.
This quest has a required prerequisite to get the ending you desire. (The overly horny cop)Ask her what she needs to pursue the don. Or you'll gate a game end dialogue and the title screen.
You need to finish Cassie's first part before you can progress Fawn's route which will get you to upper ark; Upper ark also carries most of what milk farm needs, and a good amount of plotpoints, and the machine to continue into the forest.