Her Prisoner (by Susan Strict)
She waved it in front of his face. "It has three different functions," she said proudly. "It was really expensive. They said it was the most powerful one they made. Here, see? This slider makes it vibrate. It's ever so funny if you turn it right up and put it on the floor. It jiggles around all on its own as if it was trying to get away. This slider does the balls in the middle, take a look. See this softer bit here? There are lots of balls in there and they whiz round and round. That's a wonderful feeling when it does that. And this third one, that's for the end. When I slide it up, the whole of the end tilts over at an angle and then begins to rotate. It's amazing. I've never turned that one all the way up to full power! What do you think?"
"I'm sure it's very nice," he muttered.