Cum countdown after an agonizing edging

It's time to tease slave, and maybe ruin him.. It all depends on my mood.. But either way, he's getting tormented. He has zero control. He's strapped down, gagged, and handcuffed. Stuck there for me to tease, edge, and taunt. I have my slave well trained. He's not allowed to cum without me saying he can. Even when his dick is so sensitive after being locked up so long. After what must feel like an eternity of teasing, I give him 10 seconds to cum.. Or else he's getting denied this week.