Розчарований оргазм з ударами по члену

I educate my cuckold slave by jerking him off and pounding his cock until he is about to orgasm. And when semen starts to come out I frustrate him and deny his orgasm by hitting him harder. It is the best way to have a man submissive so that he is at my feet. Leaving him on the verge of orgasm and denying it to blows on his cock.