You give him a sleeping pill that you say is speed. He falls asleep and you slap a chastity cage on him. You also tie him to a special restraint chair. He wakes up and demands you release him. You tell him that he will be your servant.
"NO FREAKING WAY! I WON"T BE YOUR SERVANT!" he shouts.
"I put that cage on your penis. It's magic so that nothing can break it. If you ever want to be released, you'll do what I say."
Stanely starts sobbing, knowing that you are in control.
"Well, what'll it be? Be my servant or remain locked forever."