What Does "Slaves" Mean In This Context?

"You said they were slaves?" Emma crossed her arms over her chest. A defensive posture.

"And I wasn't joking. They're slaves." Aces insisted. He gestured to one of them, a petite woman with black haired marked #8 rubbing the feet of a patron subserviently. Her eyes were glued squarely on the man's crotch. "Mr. Salvadore owns them. Not, like, on paper or something. But, he owns them as much as you can own a human."

"There are a bunch of cages in the back." He continued, pointing to a secure looking steel door to the back. It had a curious locking mechanism. Clearly it had separate locks for both the inside and the outside. "He showed me back there one time. When they aren't on the floor, they're locked up in their little cages or getting rented by private customers. Maybe he'll have them take lessons. Or just letting the staff fuck them. Every minute of every day, he's in control of them. I also think he fucks with their head somehow. Sometimes he only takes ownership of them for a little while, but when he lets a woman go, she's always...changed."

"Notice the numbers around their necks? He doesn't like them getting called real names. Might make 'em think they're people. That broad right there." He pointed to #28. The man had just cum inside of her. He was in the process of pulling up his pants and slowly twisting the long dildo-like plug back into place. She was just laying there, panting."The one with the heaving tits? I actually knew her. We went to high school together, would you believe. Young face like mine. Anyway, her name was Rachel. But, if I called her that I doubt she'd turn her head. No one's called her that in years."

"Doesn't like them talking too much either." He continued. If Emma was in shock before, she was absolutely stunned now. She could barely move her jaw to ask a question. "According to Mr. Salvadore the only things a **** needs to know how to say are either No, Master or Yes, Master. As I said, they're slaves. Not women."

"So, what do you think, eh, Missus Sean?" He stretched his arms. Even after that whole explanation, there was something nonchalant about his whole demeanor. For him, this was just any other day. "Pretty crazy, huh?"

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