Once a week I let my slave out of his chastity cage, but he has to pay a fee before I turn that lock's key. I tease him until he is good and hard before I unlock his cage, watching his cock become red and squashed in his tiny trap. After I release my slave, I inform him that getting hard in MY presence is unacceptable and will cost him extra. I stick his cock in my special penis pump that measures the size of your boner and how much money he owes me. With every pump of my erection fee calculator his cock swells and his debt grows.