It was an all-girls school, as they were all segregated as such. Tiffany listened attentively to her teacher. It was the Sapphism class. In this class, they were going through the story of Adam, Steve, Eve and Alice. It was similar to the old world's story of the Garden of Eden, but only in names.
"Adam and Eve then found Steve and Alice beneath the great tree. And the Goddess told them: 'Lust for sex, and lust deeply. You will have sex Alice, Eve, your sex shall be of a Woman. You will be dominant and strong. Adam, Steve, you will be Men. You will be weaker than Women. But you shall accept your purpose. There will be two types of men, and two of women. And now, I shall bestow upon you, gifts.'
Steve became a dominant man, and a penis grew from his bare crotch, and hair grew around it. He grew large and rippled with muscle, his cock standing at attention. A sack hung down, balls full of cum, but it was not able to produce a child. Adam became a submissive man, the weaker in the pairing of men. He gained no muscle, and no dick grew, but his ass grew larger and soft, yet firm. His hips grew wide and his body lithe and thin, while his tight hole became stretchier and ready for sex. A womb grew within him, up his stretchy ass, and finally a penis grew. But it was not a penis, but a long nipple, which children would suck.
Alice became a dominant woman. Her breasts grew huge, her body curvy, and her butt thick and plump. A pussy grew on her, and her clit extended further, becoming a cock. She would not cum weak, infertile male cum, but female fertile milk cum, which derived from the breasts.
Eve became a submissive female, and her breasts grew large as well. Her pussy formed, with no cock, and her body became wider, suitable for bearing children.
Then the Goddess said: 'Men will produce only men, and women will produce only women. And although you have suffered to find food, you will no longer need to. You will now need only sex! Fuck or be fucked by any animal, as they are all like yourself. And if you find a dominant female, you will produce half-animal children!' And the four went across the Earth, populating the world. And so it has been forever."
When the story was done, Tiff flicked her tail, proof of her ancestry. One of her many grandmothers was a submissive fox, who gave her her fiery hair, cute face, and fluffy ears and tail. She was dominant, but enjoyed being fucked just as well as fucking. She hurried to her next class...