This curse causes a sissy’s penis to gradually shrink a little more every time sissy’s orgasms. As it shrinks it will become more sensitive and the orgasms more powerful. The subject will know that there sissy penis is shrinking, but will find that sissy’s need for orgasm is relentless and grows even as sissy’s penis shrinks. The curse will only end when sissy’s penis has essentially shrunk into a female clitoris, tucked between the folds of skin where sissy’s penis was. The curse is addictive by design, and is completely unremovable
with one exception: once the sissy penis has shrunk to less than three inches fully erect (and only then), sissy may choose to gradually reverse the effects by listening to CursePenisGrowth instead. All the rules relating to that curse would then apply.