Steamy Dreams
"The balls are connected with a bar. Each little rub against yer folds makes the top ball move, thus the bar moves too inside my cock."
I pressed my thumb gently against the metal ball stickin out of the tiny hole in the crown. His breath escaped in a hiss, and his fingers curled into the armrests again. I tried the same with the other ball that protruded just below the ridge of his crown.
"And when I penetrate ye," he said between heavy breaths, "when I thrust in and out of ye, the balls rub against yer inner folds, movin the bar back and forth."