Perhaps logically, one of their offspring was given a new life in Sao Paulo, coming into existence there in the late 2000s. He got adopted by a fairly well-off middle-class family, and they named him Tane. Tane's life was fairly comfy and normal for his childhood and early teens, and aside from his adoption, nothing about him particularly stood out to anyone.
But then, he awoke on his 15th birthday, and slowly realized something. Overnight, he had had a weird, very sexual dream. He had seen a beautiful, middle aged Brazilian woman transform into a handsome man, a scrawny but cute white boy turn himself into a pretty girl, and the two of them make love until he filled her with his seed, his sperm fertilizing her egg and making her pregnant.
Tane wondered what it had meant, and to his surprise, he realized they were his biological father and mother. He had never known whose loins he had sprung from, and finding out that the people in question had used strange powers to reshape their bodies to produce him was astonishing. He wondered what these powers were, and if he had anything like them. Pulling off his bedsheets, he asked himself, "I wonder if I could turn into a girl like mamãe?"
In answer to that question, his body began acting on the desire to alter. Tane felt a shiver run through him, and pulled off his pajamas and underwear hastily, shakily getting up to see himself in his bedroom's mirror. Before his eyes, his face turned less angular and more pretty; his figure went from straight to curvy; his faint layer of body hair almost vanished; and his arm and leg muscles shrank.
As the changes reached his chest and crotch, the emasculation and feminization Ty had partaken in echoed through to her child. Tane saw and felt his nipples swell and grow sensitive, before the flesh around them expanded too to give him pert C-cup breasts. Between his legs his penis rapidly shrank down to a tiny, sensitive clitoris, his testicles moved up inside him to reshape into ovaries, and his scrotum tucked inwards and a vaginal slit emerged from its seam.
Mentally, he became she, and went from male to female. Tane was now Taina, and she felt amazed at her new sex- not to mention how she'd just transformed from a boy to a girl. She wondered what to do next...