2 Mistresses tease his Dick in a Spiked Ring

Yara and I tie our slave to a bondage chair, because we have devilish plans for him today... We're going to fixate a spiked ring to his cock. The spikes of this ring will dig into his penis as soon as he gets an erection. We will of course make sure that his cock gets harder and harder: Endless teasing with a single finger on the glans, teasing his balls, wanking and finally a vibrator! Just before he reaches orgasm, we stop stimulating him to ruin his orgasm.