One of my golden rules is that I demand my slave's cock always be erect and saluting me whenever it is in my presence. I was a little disappointed with it getting a bit soft. Normally, I would have enforced my rules and punished him by whipping his penis 20 times. But since I had already milked him multiple times that day - I decided to have some mercy on him and instead punish his cock with some sensual CBT. That is, the art of sexually frustrating a male slave by teasing his cock continuously. Unlike penis whipping, it does leave any marks and there is no risk of injury to the slave's body. Instead what it requires is careful tormenting of the most sensitive spots on the cock. I start by giving him some spit lube and then caressing the frenulum and the raphe with my magic fingers. When his cock was accustomed to my touch, I switched to the wartenburg wheel to stimulate the raphe with strokes starting from his perineum, running along the shaft to the frenulum. When I could see my slave was enjoying it too much, I switched to dominance mode, by tigress clawing his balls before slapping his cock around to remind him who's the boss.