I smiled broadly at him and teased him, saying:
"Can't you just control yourself once, dear? I'd really like that, and I'm sure it would help me 'get into' fucking you if I knew you were really loyal to me..."
He still was hard and frustrated from all the teasing he had had that day, and seeing me bent over the sink made him want to fuck me doggy style. But he felt too controlled, so he just felt more and more like whimpering when I teased him.
But I kept smiling at him, waiting for an answer, and he finally nodded his head and softly said that he would try.