Isaac's mind was vaguely aware that the other slaves had left, but it didn't take away the idea of being watched. That bounced around in Isaac's head, and if he hadn't already been hard, that would have done it. He didn't wait for Derek to set the pace, but instead worked his hips in small circles, grinding himself against his Master's stomach.
"I wouldn't mind," he said thoughtlessly, his head tipping to the side. His walls were down, but it didn't make him any less submissive.
"They could watch us. Do you think they would be surprised, Master, that I keep myself open and ready for you? When the see the plug, see me tight around it..."