>>719099070
>Kunoichi partially possessed by a sex demon, she can drain enemies but when she is pleasured the demon gains ground. Additionally if she abstains too much the demon starts (self) sabotaging her efforts to get her into erotic situations. The better you play, the more perilous it becomes, but you can't just fuck your way through the game either. Combination of defeat and victory sex.
Then I'll milk it on patreon adding one enemy to the tutorial level every year or so, and maybe 1-3 still images.