Slaves should never be distracted. When my slave's service suffers, I decide he needs to learn how to focus on ME instead of his cock. I train him to be able to focus on me while I steadily increase painful electricity on his cock, warning him that if he falters or get too excited, he'll be treated to a hellish cold shower like the he is.
As the electric gets more and more severe, he finds it harder to focus, so it goes even higher...

xoxo, Cybill Troy