It was rare that Derek was this selfish. He prided himself on being able to please his slaves, especially when they seemed to not expect it. But right then, he wanted his own pleasure, reveling in the way that Isaac accepted his cock, his expression almost worshipful, lips parted in supplication.
It was that complete submission, that near joy in Isaac's gaze and posture, that made him moan, made him reach his climax earlier than anticipated, and spill while still buried in his throat.