Ruined Handjob Restrained to a Chair in a Barn

My chastity sub was ready for his balls draining after being locked in a chastity cage, teased and denied for a while so I restrained him to a chair in a barn naked. His wrists and ankles shackled to the arms and legs of the chair and I blindfolded him. Once restrained I sat on a stool next to the chair and it was safe to unlock his cock and get to work stroking his shaft with a fleshlight quickshot. When I get his cock throbbing and ready to fire, just at the sweet spot where one more stroke would cross the threshold, I stop stroking to ruin his orgasm and let his cock twitch away frustratingly up and down with his cum firing out.I'm