Sorry if there's a lot of sci-fi expository bullshit in the beginning, but I might want to explore different universes in the future, so this first one will have to explain how that all works. I'm also new to writing, so I'd love to hear constructive criticism!
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Our universe is not alone. Much like how the Milky Way is only one galaxy out of billions, the Universe is only one out of an unfathomable number of universes, each located in a different place in the Multiverse. Sometimes, the difference between these universes is incredibly small— in Universe 1764-C, for example, John Smith wore a red shirt last Friday, while in Universe 1764-D his shirt was blue. In other cases, the difference is huge— in one universe, the laws of physics could be completely different than another.
Universe 621201-F is quite similar to our own, except for one pivotal difference— there are three genders instead of two. This third gender is known as futanari— as you probably know, futas have the tits and pussy of a woman with the dick of a man, although they are more well endowed than either women or men. Futanari are also stronger on average than either of the other sexes, and are often born natural leaders. Some of humanity's greatest leaders, in fact, were futas, like Augusta Caesar, Sarah Lincoln, and Winnie Churchill.