And now hopefully the reality has dawned on him, you can't really ever let him out of chastity. He is a beta now. He is a beta for life.
Train him to worship you. Wear sexy outfits. Grind on him in tiny panties and bite the key to his locked cock. Let him suck you toes. Let him taste your pussy. Let him suck your strapon. But never let his little penis try to fuck any pussy again.