Edging and Dildo Play Make Sub Explode with Huge Cumshot

My slave did a really good job earlier by taking my big strapon and cleaning the kitchen while his cock has been locked in his chastity cage. I reward him by letting him kiss my purple fake lips and teasing his castity cage. Now I set him free slap his dick and start to edge him with my long latex gloves. I know that he loves to be filled, so I make him suck on a purple dildo. I slap his balls and cock while using his mouth some more. We change positions, I sit on the table, have him lean against me to properly grab his cock and make him suck the dildo. I decide to give him a reward and will allow him a release today. I start teasing his asshole with my fingers and start to massage his prostate. He has to hold the dildo in his mouth the whole time. Our house rules say that he can only cum with his anal hole filled and I shove the purple dildo up his ass, fucking him while jerking his cock. A few seconds later and he moans in pleasure and squirts a big load all over himself!