It could have been worse. It could have been much worse. He wasn't at all pleased to know that Isaac had let another slave touch him--it was oddly out of character, but perhaps spoke to a need that Derek wasn't fulfilling. After all, if a slave misbehaved, the Master was just as at fault. More troubling was the way Isaac had concealed the incident--or at least delayed in telling Derek about it, but had been clearly wracked with guilt, if he felt that he shouldn't be allowed to come.
He sighed and scrubbed a hand over his hair, his face, scrubbed his stubbled chin, then swallowed, because what came next wasn't going to be easy for either of them.
"I'm...gratified that you told me, although you had the opportunity to tell me this morning, and you didn't. That tells me you were afraid of my response, and that's...that's disappointing, Isaac," he finished, softly. "And then you decided what your punishment would be, when you know that's not your call to make. That belongs to me, as your Master." Isaac had a tendency to self-discipline, and this was a perfect example.
"And you are going to have to be punished for this." His eyes flicked over the boy's form, formulating his plan. If he didn't punish Isaac, the boy would just continue to punish himself. "Finish undressing, and meet me in the playroom. Leave your plug here. You won't be needing it for awhile."