Isaac's head tipped to the side, as he buried his face in Derek's shoulder. He had always had a high sex drive, but now that Derek was receptive, he had a difficult time keeping his hands to himself.
"I swear I didn't make myself come," he said, quietly, embarrassed but smiling. "I just... fingered myself long enough to slide the plug in."
He had never used the small, glass plug so much, as he had in the last few days, always keeping himself open for his Master. There was no comparing size, of course, but it was a start.