As my cuckold, your job is to always do exactly as I tell you, including cleaning up whenever I have sex with a better man. And often, this requires you to clean up cum. You'll been good, so I'll give you a reward -- I'll let you lick his cum off my chest!
Time for you to go into chastity! I'm going to lock you up, and then you'll be even more desperate, subservient, and obedient. And you will just have to worship my tits while in your cage, unable to stroke yourself, but loving every moment of it.
You want to stroke for my 28GG tits, so here you go -- I'll teach you how to stroke perfectly for me, then get you all set to cum just when I say so, which will of course be after 28 strokes. It's just a perfectly fitting number, isn't it?