He hesitated, not only because he'd been disobeyed, but because there was that chance that Riley was just playing. That he had no idea what he was doing and though it would be 'fun' to see how it worked being a submissive little pup. In which case he'd give him the small chance to back out again. He didn't back out though and Tao nodded to himself.
He stepped closer to the bed, getting on his knees at the side so he was just in arms reach and this time, there was no pausing. He simply brought the whip down, right, then left, back and forth, in an unrelenting pattern along Riley's upper back and down. He didn't build up but used nearly full force, he could smell he'd hit flesh a few times and even drawn a bit of blood. He wouldn't feed, but the smell of it was intoxicating.