Chastity. Rewards for the sub or Domination and for her use only.

For those that know, my live in boyfriend is also my live in sub of 9 months. We have started to dabble in chastity, which by far is my favorite fetish. He is not turned off by this, and it actually turns him on. As does cuckolding.
Today we were discussing putting his device on and getting bigger rings for it as it is quite tight. Which doesn't bother me one bit lol. Anyway, we were discussing his chastity and the first thing he says to me is: if I wear it for a certain amount of time, do I get a reward for wearing it? This made me mad. I replied with, no this isn't about you, it's about you being in chastity for me not what you want.
So, that leaves me to ask all the ladies who have boys in chastity. Do you reward your boys for spending time in chastity, or are they in it for your pleasure and dominance? Boys, feel free to answer also what your thoughts are on this subject.