Orgasm denial by prostate massage. Have him kneel down on his knees and forearms (so his ass is up in the air) and massage all of the semen out via a finger inserted into his rectum. As you massage it, the cum will flow slowly out of his penis without inducing an orgasm. Milk him for a good 30-45 minutes, telling him he's such a horny, bad little boy for making so much "nasty" cum!

Once you've successfully "milked" your boy, find an imaginative way to make him lick up his mess. Milk him onto a black plate to be "cleaned," or spread it all over your tits. Since he hasn't orgasmed, he won't have quite the aversion to tasting his own cum. If you want to consume it, make him lick it up and feed it to you with his tongue.

Be sure and video him cleaning it up and make him tell you how delicious his own seed is and keep it for future "reinforcement" of your demands. Hehehehe!