This is my slave’s first time serving me and his cock has been rock hard the entire time I’ve played with him. He wants to cum desperately but I want to make it a challenge. I take a spiked cock ring and screw it down onto his cock. I tell him that for every few strokes that he doesn’t cum, I will continue to screw them in tighter and tighter. I laugh and tease him as his erection grows harder but he can’t cum with the sharp metal points digging into his flesh.