"As you wish," he replied, tapping a wand to the gag to change it from a ball to a bar and placing it back in her mouth before fastening the straps securely behind her head. "Do feel free to make whatever noises you need to," he added as he stood, "the only thing that will make me stop is that bell in your hand – do not drop it." With that, he strode around the back of the bench and paused for a moment before pressing his thumb into the plug. She yelped in surprise at the increased pressure. He murmured an unintelligible spell and after a beat she felt the plug expanding, pressing outward against her. She moaned at the stretching sensation but before she could start to adjust, his hand came down hard on the flesh of her right arse cheek, forcing a gasp out of her. He hit her again on the other side and continued with strikes of varying intensity falling across her buttocks and thighs. 