The concept isn't bad; getting an ally who can either obey you like in a standard JRPG or do whatever the hell they want on their own is practically genius. Though, if I'm trying to use a medkit while at low HP and she snatches it away saying 'this is my shiny thing,' that'll be some Darkest Dungeon level bullshit where spiders decide to send your hero to the grave on the very first turn (because of the speed and the crits). Special events and maintaining dominance are also interesting. However, I really don't like the concept of continuing to gain experience for kinks. It'll end up like Karryn's Prison in the late game when playing through sex just a couple of taps and boom, orgasm, because you've got a bunch of developed whore passives that increase erogenous zone sensitivity, and hello to reduced maximum Energy (cuz again, passives) for the rest of the day, which brings you closer to a guaranteed defeat in battle since the limit can drop to zero, causing stamina to plummet and then leading to a loss. Just imagine that in battle, on the very first turn, the girl bumps Arousal from 40 to 100, then uses Temptation on the second turn, and two turns later, it's already an orgasm and half way to lose. Fun? I doubt it... I'm still in favor of gaining dominant kinks upon successful domination and submissive kinks upon defeat, which would weaken or block previously acquired dominant kinks.
But that doesn't matter. Some people don't want to see anything in the game other than full femdom. So buddy, don't count on it.