MTL - Marrying The Villain - Chapter 87 emerge

An average man is reincarnated in the world of DxD! How do you survive in a world of battle-hungry monsters? With a cheat skill, of course! Devour the competition, becoming stronger with every fight! From the depths of the Familiar Forest, the Beast King will rise. (Harem, Gamer!SI)

A boy wakes up with omnitrix as a X-GENE

Wyatt Jacob, a young man who hated the profession he once loved as a marine biologist after being brutally castrated and sexually assaulted by a pod of dolphins, had lived his life with pain and suffering as an impotent man having no other choice than to continue his work as a marine biologist with the emotional trauma that now accompanied it to earn a living.

But that was until he met the 'Happiness god' who granted him the chance to be reborn in the 'World of Tharcania'. A world filled with wonders and mysteries as 'a pirate; -'a prince exiled by his empire and thrown into the sea.

Now given another chance to live his life with his little brother intact, Wyatt will sail the seas of the 'World of Tharcania', exploring its beauty and wonders with the various pleasures that came with it.

The ill-fated high school student Liu Yuan obtained the inheritance of the top civilization in the universe and changed his own destiny. He also used many powerful technologies in the inheritance to lead the Chinese nation to rise in the universe.

- Description from novelbuddy