In the interest of reinforcing the new dynamic, his reward should be pleasing you and/or being allowed some release. Since you enjoy sucking on his dick, you should do that for you. Restrain him, blindfold him, then using his cock as you please. Make it clear to him he isn't to cum, that he needs to learn control, but make it difficult for him not to.
When you have had enough of watching him squirm and moan, stop. Ice down his balls til he's soft and tell him he was a good boy (or girl if you are really moving the feminization all the way) and that if he wants to cum, he will be allowed if he asks you to fuck his ass with a dildo while he jerks his little dick. Also tell him it will be his responsibility to swallow his own cum from now on, you never liked doing it and you're glad he's your little slut now so he can do it instead.
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