>The esoteric magic system
Magic comes from the Lingam and the Yoni, wellsprings of generative power with the body that are associated with the genitalia. While normal men and women have a Lingam and a Yoni respectively, Futas have both and as such have a greater grasp on magic. Typically, the Lingam is associated with direct, destructive powers while the Yoni is passive and nurturing, more powerful magical effects require the combination of the Lingam and the Yoni, meaning only Futanari may cast them on their own, while normal men and women must work together in tantric sex rituals. As the Lingam and Yoni are very directly tied to the genitals, stimulating the genitals or using their fluids as regents makes magic easier to perform, with actual sex being the most effective method. Futanari also have another advantage over other humans in the form of Lust, not just a hormonal urge but a supernatural sense of ambition and raw sexual energy gifted by the primordial Rebis to aid Futas in their goals. Lust can be called upon to enhance a Futa's physical abilities or to grant herself a supernatural allure and it is also used in powerful Futanari magics, but spending Lust is taxing on the Futa's sexual stamina and a period of abstinence is required to rejuvenate Lust.