Normally after a man ejaculates he wants to just relax and not think. He wants nothing to do with sex for a while nor does he have much of a desire to please and listen. So having him deal with his cum after an orgasm is something unnatural to him. He absolutely won't want to do it. Therefore, it will require your firm command and his submission. This is great training since he will be doing many more "unnatural" things later. 
It may take a couple weeks, but when he can swallow his entire load you will know that you truly have dominated your man. Here are some quick suggested scenarios. 
Level 1: (gentle force) - Take A dab of his cum and make him taste it- Kiss him with his cum on your lips Level 2: (forceful) - Scoop cum into your hand and force it into his mouth- Take his cum in your palm and rub it in his face Level 3: (submission under threat) - Have him lick cum from your palm- Have him lick it off your body- If he cums in your pussy or ass make him eat the creampie* Punish. Mmm, wouldn’t you just love a way to control her? To make sure she was always a good girl?” I shuddered as my daughter’s tongue wiggled around inside my asshole. “To discipline her when she’s bad?”“Yes,” the cop answered.I smiled, wicked ideas bursting through my mind.Mitch MillerThe next day, my wife walked into the living room and smiled at me, playing with her amulet. ... good girls use their mouths not to talk back but to suck their daddy’s cocks... “I see Valerie’s being a good girl,” my wife said as our daughter bobbed her head up and down my dick. Valerie’s lips were sealed tight about cock, working up and down my shaft. Our fifteen-year-old daughter sucked with passion.“Yeah,” I said. “She’s being a good girl today.” I held a handful of my daughter’s hair as I stared down her back at her rump, still pink from her spanking yesterday.Valerie moaned about my dick as my wife sat down beside me. Anna had a bright smile on her red lips, her amulet swaying between her naked tits..
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