MTL - Dragon Inside - Chapter 44 Start hunting (fourth!)

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

With his engagement at hand, the most terrifying and legendary person of the legal world, Fu Huai’an, returns with a son.

Before the engagement…

He asks, “Since you love Wen Moshen, why are you in my bed?”
She says, “Because I cannot watch idly as Wen Moshen’s woman enters an engagement with you.”

With a cigarette in Fu Huai’an’s mouth, he crosses his legs. Across the light cloud of smoke, he squints his eyes—watching as Lin Nuan’s slim arms wrap around his neck; he feels stirred.

So a person can love another so passionately.

“You call what you did a kiss?”
“…”
“What a pure lady!”

Fu Huai’an spews out a cloud of smoke and snuffs out the cigarette. With a mellow voice, he says, “Let me teach you what kissing is!”

But, what he teaches Lin Nuan doesn’t seem to be only a kiss…

- Description from Novelupdates

Tragedy struck in form of his father's death, leaving their poor but happy family in shambles.A few years after, when their life was showed signs of coming back on track, another tragedy struck, Ryan lost his mother and younger sister to wildfire.Devastated, Ryan lost the will to live and ten years later, at the age of 28, died in a car accident.At the last moment, he was happy because he was finally reuniting with his family and reunite he did, but just not in the way he thought.He opened his eyes and realized he had traveled back 10 years in time, to the day when the fires broke out and took his mother and sister away.This was his chance to save them and change the course of his life. Goddess of luck also seemed to be smiling upon him because he got a system.Armed with ten years of memories and the fantastical system, he will rewrite his and his family's destiny.... but he did not expect that he would be playing a much bigger role.===Additional Tags: Smut | Illicit | Pervert | Okyadon | Milfs | Wonderful Story | Unveiling Mysteries | Complicated World | Secret Organisations | Superpower | More might be added if needed |

A Japanese salary man was reincarnated in a different world with swords and magic. He reincarnated into the family of a powerful noble. One day when he became twelve years old, he was suddenly summoned by his father.

「 I do not mind whether it is a woman in the town or a maid in our house, learn about women.」

Having gained the permission of his father, he uses his power as a noble to have his way with women.