Tongue tease night
Tongue tease night is a good checkup, to see if he can only touch with his tongue, and if he can delight with his tongue. It's a way to focus on training the basics
Delight
Know he is locked up and choosing that in submission to you is delightful
Lock him
Ladies, if you find this link in his internet history, lock him up! You will gain full control, and he clearly wants and needs it.
Weakness
Even the strongest and toughest man is brought down swiftly with a kick to the groin... Such a tender weak spot. That's where you gain control over him.
No complaining
if he complains about his balls being full or aching, that is a signal he should be using to think of you, and how to please you.
Let friends borrow his chastity key
Let your friends borrow his key, and let him know you can't unlock him because your friends hold his key. Even if just for a day or 2. Your friend doesn't even need to know she's holding his key. You can have it I'm a little package that is giftwrapped, and ask her to hold onto a gift For you so you don't find it and unwrap it early. Delightful tease
Selfie tease
Send him provocative selfie photos with friends, with captions like, "hi, Subby". He will be reminded of his submission, will be in awe of your beauty, and curious if you are discussing submission and domination with your friends
No panties
When you are out with your friends, leave him caged and wearing panties. Then, let him know that since he has panties on, you decided not to wear any. He will be very eager to greet you when you get home, to see if that was true or not, and will want to ensure you are satsfied.
Finger power
For a keyholder, a finger beckoning is a very powerful and persuasive mechanism.
Thong
This is the most simple, cheapest, easiest advice to follow.