Aryuu the unknowable god - Chapter 17: Bab 16 - Lucius, Si Murid Misterius & Tes Adu Familiar---

The little handsome son-in-law passed through a world as waste material and the husband of a wealthy family. But because of his lacking aptitude, the wealthy family had driven him out. So he worked hard and found a more powerful family’s thighs to hold onto. Soon enough, he became the strongest son-in-law and husband in history.

In this world, it was impossible to practice martial arts. It was futile so he might as well take advantage of his wife’s thighs and maintain a comfortable and leisure lifestyle.

He’ll train his wife to become the strongest and best person in the world.

“Whoever dares to provoke me, let my wife kill you!”

- Description from Novelupdates

The protagonist is an accidental time traveler - he didn't wait, didn't guess, only dreamed, but ended up in history, which he didn't pay much attention to. He was just lucky with his lineage.Ryo is a new member of the Nara clan, from the Uzumaki lineage on his father's side, and it so happened that he was born not at the beginning of the known plot, but more than three decades and two world wars later. Now he has to figure out how to get out of this situation however he can.

He is a threat to her existence.

A hot-blooded dragon of Royal blood, King Malachi is taken hostage by the humans he despises so much. Deprived of his freedom, he is imprisoned in a dark cave, his rage growing with each day of torture and humiliation. The only light he sees comes in the form of a human female, offering her care. A woman who makes him burn with equal fury and desire. A woman who has no place in his heart or mind, for only one thought sustains him.

Vengeance! And even if her kindness softens his heart and her touch sets his body aflame, she will not be spared his wrath. Because once he breaks the chains of slavery, he will burn down her whole world.

She is the key to his freedom.

The cold-hearted princess Ravina is a woman with a mission. Eradicate the dragon race from the face of earth. But when she finds out that the very creatures who killed her parents could also be the ones who kidnapped her sister, she has no choice but to change her plans.

To find her sister, she must get closer to the creature she despises. But things don’t always go as planned and soon Ravina ends up finding more than she bargained for. Caught in a battle between humans and dragons, love and hatred, trust and betrayal, Ravina must make every choice with caution. And with every step she takes closer to the fiery beast, she risks melting the ice surrounding her heart and being consumed by the flames of fury and passion.