[One Piece] I Became Ace's Mom, but Dad Gave Birth

[Content warning: Mpreg, not a normal biological process, but a Devil Fruit ability! Plus a sweet, feel-good slice-of-life story]

One day, Lu Jiu, newly promoted to Rear Admiral in the Marines, ate a Devil Fruit called the Birth-Birth Fruit, and from then on found herself on an irreversible path to becoming a delighted mom.

Years later, she was a mother of N children, discovering new kids every day, with ex-husbands scattered all across the Grand Line.

While so many people shouted about love and children and charged toward the ONE PIECE, Lu Jiu was still working hard to become the World's Strongest.

…

The Birth-Birth Fruit claimed to be a System and appeared in Lu Jiu's mind.

System: “I'm a childbearing System. That is, um, giving birth. To keep the world developing, someone needs to give birth to the protagonists.”

Lu Jiu: “Can men give birth too?”

System: “Biologically speaking, men can't give birth. No, don't jump into the sea and try to kill yourself yet. Let me finish. This is the world of the Pirate King, and I turned into a Devil Fruit that you ate, so now men can give birth too.”

Lu Jiu: “Then set it so men give birth. I have a cold womb, so I can't.”

System: “Okay.”

…

Roger: “So what if a man gives birth? I'm her true love!”

Shanks: “Just go, Captain. I'll take good care of the captain's wife!”

Mihawk: “Master or wife, that is the question!”

Lu Jiu: “Sigh, a mom again.”

Dragon: “I'm a dad of two. What's wrong with that?”

Garp: “Just how many grandsons do I have?”

Kuzan: “Senpai, I told you not to date around so recklessly.”

Ace: “Why do so many people want to be my dad???”

…

Content warnings:

* N powerful men, healthy romantic relationships, female-centered! Female-centered! Long live women!

* My type is mature men! So I'm going to have romances with mature men!

* It's that Lu Jiu, Ace's mom, so, um, yes, men give birth. If you ask how, it's a Devil Fruit ability. Don't worry.

* There are three babies in the Pirate King world: Ace ×2, Luffy, …

* If this bothers you, don't read it, and don't criticize me. This is just what I'm into, so please forgive me. I'm a pervert, I know, and I'll reflect on it.

* I'm writing this to explore more possibilities, and the logic will hold together.

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Theme: Give birth? Give birth!