I recommend a fantasy novel where the male protagonist has the Chaotic Body and later becomes the Chaotic Sacred Body. In the novel, the first child gives birth to a dragon and a phoenix, and the boy has the Chaotic Yang Body.

The girl has the body of chaos yin

Answer 1

"Invincibility Begins from the Primeval World" is a Xianxia, mythical, and cultivation novel written by a boy in the past. The general plot of this novel is as follows:

Chaos is not divided, chaos is not judged.
He traveled to the chaos before the creation of the world.
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"The Empress Reincarnated as My Sister" was a fantasy novel written by the author, An Lin. The general plot of the novel was as follows:

Su Ninghan reincarnated. In order to recover her cultivation as soon as possible, she used her divine power to choose the Ancient Su family. However, she did not expect that there was a baby boy in her mother's womb! The two of them often fought for cultivation resources in their mother's womb. One day, the baby boy snatched away all the cultivation resources. The empress was so angry that she became a premature baby. But so what if she was a premature baby? She even became a younger sister. This was intolerable! However, she soon discovered that her twin brother was extremely powerful and had monstrous cultivation talent. He didn't look like a human at all, but like a god!
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"Chaos Yan Tian Biography" was a Xianxia and Mythological Cultivation novel written by the author, Ba Fang Ming Dong. The general plot of this novel was:

The young man had experienced all kinds of hardships in the world. When he met the divine soul, he understood the spiritual fire. He became brothers and went to the end of the world. He punched the white tiger, kicked the green dragon, and suppressed the heroes to step on the sky.
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"Covering the Heavens: Wang Teng's Father Has Another Concubine!" This book was written by the author, Dream at Midnight. It was a fantasy novel. The general plot of this novel was:

Wang Feng, who had passed through the Heaven Covering World and had mediocre talent, had unexpectedly awakened the reverse blessing system for his descendants.
Every time he gave birth to a child, the system would reward him with benefits such as cultivation, weapons, and lifespan.
At the same time, the cultivation of his descendants would also be fed back to him.
Thus, in this world where all races rose and gods stood, Wang Feng gradually found an extremely reliable path to vindicate dao.
Give birth to a baby!
On the day when the nine dragons pulled the coffin and descended on the Big Dipper, his wives were giving birth.
When the Ancient Path of Stars opened, his wives were giving birth.
When the dark chaos swept through the universe, his wives were still giving birth!
Wang Feng said, how can I become stronger if I don't have children?
One day, a crane descended, wanting to take away one of his children.
"Your son has the potential to become a Great Emperor, so you can name him Wang Teng. In the future, he will cultivate with me and inherit the will of the Ancient Chaos."
Wang Feng was dumbfounded.
How did I become Wang Teng's father?"
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"Peerless Mother, Genius, and Cute Baby" was a fantasy romance novel written by the author, Yan Yunmeng. The general plot of this novel was:

[YShuang Wen + Strong Woman, Stronger Man +N Beautiful Man, Beautiful Woman] The legitimate heir who transmigrated became an illegitimate child! Was there any justice? And a good-for-nothing? How was this possible? She wanted to reverse time and space! The appearance of the black-bellied man had brought her back to being a cultivation genius, a strange genius among geniuses!
"No way, right?" I'm only fifteen! Only one son? Are you going to let me live?"
A certain son: "Mother, I jumped out of your stomach. I'm the real deal!" Don't deny it anymore!" A black-bellied man said,"Madam, dear, I can testify that I was the one who stuffed this brat into your stomach!" "…"
"Son!" Take good care of your mother. Father has gone back. Don't let your mother bring back a stepfather. Otherwise, your future will be miserable. A biological father is better than a stepfather!" "Stepfather?" "Stepmother? Don't give your son a stepmother. Otherwise, your biological mother will go crazy!"
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The Immortal Emperor was a fantasy novel written by the author Cui Meng. The general plot of the novel was:

The two brothers were born on the same day, but their personalities were different. One had an excellent root bone, but was born evil. In the end, he walked on the path of the devil and vowed to overturn the world. As for the other, he was a good-for-nothing in everyone's eyes. He could not cultivate, but by chance, he had awakened the memories of his previous life. From then on, he went against the current and became a dragon brother and phoenix wife. He swallowed mountains and rivers. He had a beautiful wife, pacified the troubled times, ruled the world, and vowed to return peace to the world. If I become a Buddha, there will be no demons in the world. If I become a demon, what can Buddha do to me?
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"Chaos War Reverent" was a fantasy novel written by the author, Blue Tadpole. The general plot of the novel was:

He had accidentally come to a different world and obtained the Yin-Yang Chaos Art. He needed to make himself stronger to unlock the sealed cultivation technique. He needed to smile at the changes in the world, have a female friend, and fight against the heroes of the world...
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"Simulation of Immortal Cultivation: Reincarnation as the Son of the Heavenly Axiom at the Beginning" was a fantasy-epic fantasy novel written by the author, Monkey Brother Don't Run, Monster. The general plot of this novel was as follows:

[Name: Ning Zhi][Comprehension: 10][Constitution: 3][Family background: 7][Fate: 99980][Attribute allocation completed. Would you like to activate the Immortal Cultivation Life Simulation?] "Begin!" [0 year old: You are born. The sky shakes and the myriad paths revive. The entire world is cheering for your arrival.] [Your legendary life has begun!]
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"Chaos Spiritual Cultivation" was a fantasy novel written by the author Che Yuan. The general plot of this novel was:

He was an ordinary youth in Dragon Birth Town. He was mistakenly judged to be unable to cultivate star power, but he was extremely talented. During a fortuitous encounter, he learned of his talent and obtained a mysterious divine book. Not only did it allow him to cultivate Star Power, but it also allowed him to reach the peak of the strong and stand at the top of the universe.
Let's see how a powerless youth can walk a different path of strength with his own efforts. How to soar in the sky and look down on the world on this continent filled with experts…
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"Spirit Driving the World" was a fantasy romance novel written by the author, Li Yu. The general plot of this novel was:

In the world where humans and demon spirits coexisted, in one of the five continents of the Celestial Continent, the Huan family, which had never had a woman born before, defied the taboo and gave birth to a pair of twins, a boy and a girl.
There is a Huan family in the Midland. All generations are men. They are talented and proficient in magic. They can control demons and shake the continent.
Breaking taboos and defying the will of heaven, a pair of dragons and phoenixes, and a female child were born.
Was it an accident? Or was it destiny? Speaking of power, the magical zone's curiosity towards a certain someone beside him was piqued. "What do you have to say about people in important positions?" "No, the strong are respected." Magical Zone: The strong are respected? Uh. The cultivation base of this area was inferior to his. He really didn't respect and love his daughter at all! This zone needs to cultivate well, cultivate well!