A Hentai System in the World of Danmachi - Chapter 14 - 13 - Hestia, you can sleep in my bed.

The once revered Alchemy Emperor returns to his fifteenth year. In this lifetime, he not only seeks to rectify all past regrets but also aims to achieve the pinnacle of martial arts!Compared to cultivation techniques? My lackeys have divine-level technique in hands.Compared to elixirs? My top-tier elixirs are fit only for feeding dogs.Talents? Any genius who encounters me will find their fate crushed!Prosper under my lead, oppose me and meet your demise!

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

After crossing the first day, Hu Xiaoxiao beat the Emperor.On the second day of travelling, Hu Xiaoxiao beat up the Imperial Consort.The third day after crossing …“The empress has left the palace!”However, before he could walk out of the city gate, Hu Xiaoxiao was carried back by a man.The extraordinarily handsome emperor was so angry that he laughed sinisterly, “You haven't even given birth to your son yet, where do you want to run to?”

This is a world with only oceans, through which scattered are countless small islands and treasures.With swords, gunpowder, sailing ships, and most important, the Treasure Hunting System, Alka is ready to dominate the oceans!「Map detected」「Scanning for Treasure」「Scan complete」「Happy Treasure hunting!」