Chastity Strap-on Blowjob Tease

My sub wears a strap-on dildo positioned above his locked chastity cage, effectively giving me something to “blow” since I'm certainly not servicing his real cock. I command him to watch as I kneel and start sucking the strap-on passionately. I gag on it, spit runs down, and I deliberately let my saliva drip onto his actual cage below. He can only watch and remember what it felt like to have his cock sucked - a pleasure he no longer receives. It's a short, intense chastity humiliation with no orgasm, just a very frustrated sub drooling in his cage.