He notices some fitting device on their way to the coasters

"Come, ****," the man said and lead her towards a huge coaster in the distance. "We gonna get your ass trained very well on that ride." **** was jiggling her ass in anticipation. She wanted to be a great fucktoy for her owner and couldn't wait to get her ass even better trained to please him.

A few men whistled as she was lead past them and she felt really good about that. But of course, she had to obey her master, even as she wanted so much some cum from those men's cocks.

"Wow, this is cool", her master suddenly said and they stopped in front of some machine, which seemed to be mostly a box with a saddle on top. "Look, ****, this is perfect for a fucktoy like you. We make sure that your pussy is off-limits even as I give you away at some point.

**** took a closer look at the machine, which was rather simple and was saying Chaste-U on the front. There were some instructions next to it and some buttons, which seem to select modes.

"This will be perfect," her master said and pulled **** onto the saddle. She sat there, her legs widespread and he pushed one of the buttons. Immediately the saddle started to vibrate a bit and **** could feel how she was getting aroused. Then something pushed against her pussy and a moment later she felt how two cold, metal balls were pushed in. They weren't super big but filling her out a good bit. On top of that, she realized immediately that they were slowly vibrating, the vibration even increasing as she moved.

Before she could say something, there suddenly were several stings and **** yelped as she felt something clod going through her pussy lips. As the machine stopped, she climbed off the saddle and gave her master a good look. "Nice, nice," he said.

**** noticed her reflection in a nearby window and spotted that her pussy had now several golden metal ring piercings, which were going through her pussy lips, basically blocking access to her pussy for any cock or toy. And they were totally preventing the vibrating balls from getting out.

"I love it, master," she said and jumped d a bit up and down, making the balls in her pussy vibrate and **** her into an orgasm.

"Great," her master said, "now to the coaster."