Isolate the Victim.
Convince them that they like it.
Oh No Stockholm Syndrome! Stockholm Syndrome
Recruit and Convince Accomplices.
Argue with the victim.
Leave occasionally (randomly but consistently).
a Beat the victim occasionally physically or emotionally, threaten often!
b Demoralize them to the point that they believe anything you tell them as truth!
Never let the victim forget you are (supposedly),
superior to them.
Pretend Nothing's Going On!
I could only think of eight, feel free to add more of your own.