One obvious effect chastity is the so called "blue balls". During long term chastity, the slave's balls really do become blue, and very big, full of cum. To make sure that the balls don't explode, milkings are necessary once in a while. I don't want him to enjoy the milking too much, so I will do it as quickly as possible. I will extract as much cum as possible in as little time as possible, of course, making sure he feels no pleasure from the process. And since the slave is restrained in a leather strap cage, there's nothing he can do to change anything. In less than a minute the slave has his first ruined orgasm. frustratingly oozing cum on the floor. I will make him cum 4 times in less than 3 minutes, enticing him with the possibility of a real orgasm, but ruining every time, of course. When his cock gets a little too soft, it means he has been milked enough for this time, now I can lock him again and forget about this for a while.