"No scars." He said after a moment. He raised his head and stared at Sherlock. There was a hard look in his eyes. This was something about him that was not to be messed with. But as soon as it had appeared, it was gone.

John let out a breath as he thought. A safeword. He had safewords before, but he had never used them. Not with any of his other clients. But he wanted to have it in place for this.

"Cameos." He answered firmly.