History's Strongest Husband

The little handsome son-in-law passed through a world as a waste material and the husband of a wealthy family. But because of his lackadaisical 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!”