MTL - Bloodline Lord of War - Chapter 14 this one?

"An accident. She's pregnant. How unlucky. She got pregnant in one shot!

Legend says, that there is a great demon, who is the human kind’s public enemy. He is the galaxy federations’ nightmare as he wanted to conquer the whole universe. On the first day, he completely took out the human fleet, plunging them into disorder. On the second day, he declared that he will wipe out the whole federation. On the third day, he declared——that the hero who shot him in their previous battle must marry him, or else, he will destroy everything.

The galaxy federation president and the council members had a long meeting after that. They decided to dispatch a soldier, Wu Xing Yun, and marries him off to the arrogant demon. Wu Xing Yun was once a hero who fought for the nebula, and henceforth, he was tasked—— for the sake human race and the universe’s peace, to eliminate mistresses, settle his matters with the mother-in-law, and fix the man’s crooked ways.

Wu Xing Yun was very perplexed when he asked his commanding officer: “Sir, why did it have to be this way?”

Commanding Officer: “Soldier, bear in mind, that this mission of yours, is for the sake of the universe and mankind’s happiness. You must hold on to your husband, and fight other mistresses! Do you have the confidence to accomplish this task?”

Wu Xing Yun, stood straight, saluted, and instinctively replied: “Sir, yes sir! I will accomplish this task!”

- Description from Novelupdates

[Hello everyone, my name is Amamiya Ren. This might seem like an abrupt self-introduction, and honestly, I think so too.][In fact, when I first heard my own name, I had a bad premonition. Fortunately, I didn’t encounter Shido Masayoshi or Akechi Goro.][But when I discovered that the high school I was going to attend was called Teitan High School, I knew I was in trouble.][I thought I had successfully avoided the traitor, but I didn’t expect that I couldn’t escape the god of death either.][Then, as I dug deeper, I found out more information that made my heart race.][I learned about Shinomiya, who is as renowned as the Suzuki family, and Sanzenin, which surpasses both Suzuki and Shinomiya.][But none of that is the main point. It’s Teitan High School alone that made me want to start writing a diary.]Putting down his pen, the boy turned his gaze to the prize pool.Naruto, Bleach, One Piece, Katekyo Hitman Reborn, Negima! Magister Negi Magi, A Certain Magical Index, Persona, Demon Slayer: Kimetsu no Yaiba, Marvel, Genshin Impact, Fate, High School DxD, Lord of the Mysteries…---All rights to the original content belong to their respective creators.Cover Pic: By akeisae, let me know in the comments if you want me to take it down.

This is probably the story of a modern man who became the Seventh son of Kangxi in the Qing Dynasty. This is probably the story of how the Seventh brother Yinyou worked hard and fell in love by the way. So there is no doubt that this article is ambiguous, and it is easy to guess who the couple is.

- Description from Novelupdates