He can't take it anymore, and sucks the dildo

After minutes and minutes of the machine gently stroking Josh right at the edge of orgasm, the frustration builds up, and he picks up the dildo, puts it in his mouth, and starts sucking it. He starts slowly, watching Tyler's double blowjob, but soon pumps it in and out of his mouth, faster and faster until, like before, he is sucking the plastic cock in time with the women on screen, and the sensation is transfered to his own shaft via the machine.

"Oh, fuck," moans Tyler, surprised by the sudden sensation on his cock. "The machine is finally working."

Out of the corner of his eye he sees a movement, then looks at Josh.

"No, wait," he blurts out, "are you sucking my cock?"

Josh tries to ignore him as he focuses on getting himself to orgasm, and Tyler instead looks back at his own screen, trying to ignore the fact that the sudden strong stroking and suction on his cock is coming from the mouth of the man pressed against his side sucking on the dildo.

"There you go, keep going, try to relax," the voice orders them. "Now that you're starting to relax and enjoy these sensations, the collar is giving lots of positive signals. This is how you earn your way out of here."

Josh presses the dildo deeper with each stroke, suddenly motivated by the thought that this is bringing him closer to freedom.

"That's why your collars are labeled alpha and beta," she continues. "Most of you are betas, and will become fit to re-enter society soonest by learning that you need to think of what makes others happy, even if it's not what you want."

"But alphas don't respond well to that. It's faster for them to learn that, when they need a cocksleeve, they shouldn't use innocent women for it. They need to find other ways to drain their cum, like you've been learning."

The four of them look around, and after quickly conferring, realize that Tyler is the only alpha among them.

"That's right," says the voice. "Why don't you show them how it's done, Josh? Watch that guy suck that big black cock, that will really boost your progress quickly."

Josh reluctantly does so, returning to his own screen, where a guy is still sucking a woman's big black cock, as the voice reminded him.

"And Tyler," she continues, "tell everyone how good your cock feels."

Tyler looks a bit squeamish, but begrudgingly acquiesces.

"It feels so good, the machine sucking and sucking," he says. "It feels so real."

"Does it?" asks the voice rhetorically. "Do you want to cum?"

"Fuck yeah I want to cum," Tyler says. "I'm so close."

"Well," says the voice, "you're an alpha. You have to take charge. Look at that cock on the screen that Josh is imagining that he's sucking. Tell him what to do with it."

"Suck that big black cock, faster and deeper. Make me cum," he says in a slip of the tongue. "Fill your mouth with her cum."

Accustomed by now to taking orders, Josh does as he's told without giving too much thought to who he's obeying. He keeps time with the blowjob happening on screen, but speeds up, pumping the dildo faster, pushing it deeper with each stroke.

"Oh fuck, I'm so close," Tyler cries out, his huge black cock ready to burst inside the machine, "keep sucking, just a little more!"