Footjob on my cockboard

His cock and balls are exposed on my cockboard. A lot of silicone rings are bounding his balls , I have also attached a rope to his balls which I pull hard from time to time. I'm teasing him with my legs and shoes while jerking him until I finally allow him to feel my feet on his hard cock. He can't stand the awesome feeling of my feet on his cock and he is about to cum, I can't allow that and I have to ruin his orgasm. His rock hard, pulsating cock is shooting the sperm untouched and I'm pulling the rope attached to his balls to punish him for cumming.