He had no idea what she was going to pick up next, as he heard her rummaging through the chest. A riding crop? No, probably too gentle for her. A cane? Maybe. She might cross him up and go for a strap-on, given his position. But that didn't sound like her. From her comments, this girl was a sadist looking for blood.
When he felt the paddle against his back, it took a moment to remember he'd seen it in the chest. He ground his teeth into the gag, emitting a hissing sound as the studs rubbed across the open wound's she had already created. The studs were catching on the broken skin, widening the wounds.
"Please Miss Mistress," he called through his gag, before she'd even struck the first blow.