I then tied his cock and balls tightly at the base and began to edge him. All slaves have to be made to cum by me or my guests - he was tied kneeling with his legs tied wide apart and his cock was aroused until hard. I caught him jerking off in his room which is strictly forbidden in my house. I have edged a slave for twelve hours to teach him to obey me.

Just enough space between the strokes to keep the little bitch near the climax point which is exactly the way a slave should be treated.