I've trained you in ways that you may or may not be aware of. Do you think it's a coincidence that I only allow you pleasure when I'm thoroughly pleased with you first? Of course my pleasure should come first, and I ensure that by associating your pleasure with mine. You can only cum when you have permission and you know you've been a good boy for me. If I'm displeased in the slightest, then your dick is broken and you're scrambling to be in my good graces again. You don't even fight it because you love being trained by me, pleasing me, and serving as my slave.