Derek felt as much as heard the shift, the way her body--tense with restraint--suddenly relaxed, and began to beg, echoing her verbal pleas.
"Good girl," he gasped, eyes shut tight, his forehead resting against her shoulder. Still holding off his orgasm, wanting her to have her pleasure first, as a reward. "That's my good girl. And now you're going to come for me, so sweet," he added, moving his hand slightly against her thigh, bracing, so he could angle his thumb down, press against her clit. "Come asking for it, begging for it, begging for your Master's cock. Come, sweet girl."