Female led relationships discussion

Calling on experienced Mistress’ to advise a beginner! Having to deal with a disobedient sub, he finds it funny when I try to stamp my authority, I have tried different punishments but he becomes immune. The journey: I was a submissive, him the dominant, it has been a complete role reversal and it is taking some time and a lot of effort to train him. Walked off the job this morning and I didn#t orgasm, he then blamed me for writhing. Please note that I have made a massive effort to be firm with only some success, it’s not for not trying… Gratitude for the advice in advance…:confused: