My ideal femdom scenario is something like "some shadowy omnipotent figure (a god? aliens? demon queen? omnipotent magical girl? Whatever) puts the sexes in competition at-first subtly skewed in favor of women and whichever sex wins each year gets their subconscious, collective, empowering wish granted under the slowly-slipping false pretext of it being a fair fight."

So, basically, gender roles are completely redefined in context of these yearlong passive competitions. Can be anything, too. Childrearing? Being nice to animals? Making art? Either way, whichever sex wins gets powered up, permanently. Taller, bigger, smarter, hotter. Et cetera. Men, of course always say they're "finally" gonna win this year and get bigger dicks, but it never happens, because even when the girls get close to losing, they end up winning by a margin of 51-49, somehow. And, of course, it gets progressively more unfair, too, because even when the contest becomes hilariously skewed in favor of men by the deity, like knowing Roman Empire trivia, the women have already accumulated enough Intellect boosts that even tiny lolis can win against adult men at trivia night. Then, on January 1st, it's reasoned "Wow, girls... you did so well even when the competition disfavored you that you deserve an even bigger boost than normal," so maybe the girls get a double-boost, or the boys actually get their status nerfed.

Eventually, all the girls know they're going to keep winning -- and keep winning, and keep winning more, smug and secure in the knowledge that not only are they completely dominant over men, but that dominance is only going to grow even stronger in an endless positive feedback loop until girls are demigoddesses walking the Earth and boys are just wimpy little toys for them, slowly dropping down to titty-height, tummy-height, ass-height, and maybe even lower compared to obviously-superior girls.

Love that little veneer of meritocracy that the scenario has.