All men are slaves in the future ruled by ostensibly benevolent women. They have given over their power in exchange for frequent attention given to their genitals. When they are behaving they experience great pleasure at the hands of their mistresses. When they misbehave they face corrective measures.
In the early years the slaves were subjected to chastity devices like chastity belts, birdlocks and other various cock cage devices. For corrective measures there were humblers, genital pillories, and in extreme cases, electro shock collars.
Then a new technology came along creating quite a stir for mistresses and slaves alike. A procedure known as "ChasteMate" was proving effective at accomplishing most of what the previous devices were designed for. If mistress and slave wanted to dispense with the denial devices, they could opt for a procedure that numbed the penile surface. With no feeling in the skin, especially the underside of the corona, the slave was unable to get off. He functioned normally in every other way, it's just that he could only be made to cum by concerted attention paid to his balls. The numbness of the skin on his penis made it virtually impossible to get himself off in traditional ways.
A group of suburban women, and possibly others in different municipalities, got together to brainstorm how they could capitalize on the new trend. They decided to call themselves "Nutter Babes." They discussed the roles each would play in the consortium and the make up of their partnership. They agreed to all participate in the R and D of the business however, and put their slaves up for experimentation purposes.
The areas they first considered were how to mentally stimulate their men. They came up with things like ointments to avoid chafing, stimulating the testis, and correcting errant behavior. They would have to see the best ways to bring the men off, how ruff or gentle they would need to be for the long run, and what things like cock ring restriction, cropping, or whipping would work in different situations.
The slaves pretty much thought about their scrotums throughout the day because of how they were dressed, groped, and were made to submit at a moment's notice. That is pretty much how they got sold into the idea of ChasteMate. The promise of more attentiveness paid to their sensitive core area was just too enticing.
The first couple in the Nutter Babes to get the procedure was Erin and Eric. Erin read the brochures, contacted those that tried the procedure early on, and decided to take the plunge. Eric had been acting disagreeably recently and Erin finally had to pillory him by the balls outside to try and humiliate him into compliance. Erin didn't know what to do next if he continued on his course of disobedience. She decided on ChasteMates as a reset and Eric went along because he didn't like the discomfort of the denial devices.
It was a simple procedure, nothing more complicated than what a vasectomy might entail. When he was done, he was intact and free of encumbrances. It was all fine until he started feeling horny and needed to cum. To his alarm, he couldn't stimulate his shaft to even get hard. He went to Erin who examined the situation. As she played with his genitals, he began to grow hard but still could not feel a thing along the outside of his penis. Erin tested tickling the underside of his corona and discovered nothing could be done to get him off by his shaft alone. Erin next started focusing on his nut sack, and that found him swooning into her, wanting more. When she was satisfied that the procedure worked as advertised, she stopped, leaving him whimpering for more attention. "Later," she said "I've got some calls to make."
Within three hours the founding members of Nutter Babes showed up at her house. They glanced at the naked Eric with curious eyes. Erin asked him to stand before the five seated women and take his hands away from his crotch. "You've got no cages or anything on that might embarrass you, so show us what you are hiding." Eric removed his hands and stood before them in all his splendor.
"Everything seems to work as they said it would. He can get an erection, but we haven't been able to cum yet. That's why you all are here." Erin explained.