Captive cock cumming

His cock is held captive on my handjob bench so I got unrestricted access to his cock and balls and I can do with them everything I want. I taped his cock very tight with only his dick's head free and I start playing with him. Hard playing with his very sensitive cock's head makes him crazy.The feeling is very good from one side but it is too much and too good on the other hand. He is about to cum but the feeling is too strong and too good so it prevents him from cumming but finally he can't stay any longer and shoot his extremely huge amount of sperm high in the air.