Supreme Casanova: Ultimate Harem System - Chapter 39: A Size Problem.

16 years old-- most boys would be falling in love, as their hormones all rise to unprecedented levels. Most boys at Riley's age would have dreams; dreams that will slowly grow into passion. Riley, however, at age 16... killed the world's number 1 superhero.

In short: an old lover gave me a little piglet.

Qin Zhuopu, a workaholic, has been single for many years. As he reaches middle age, his family is desperate for a child.

Until one day…

“Mr. Qin, your son is already in primary school!”

“???” I have only had one boyfriend!

Seven years after the breakup, the old lover returned to the wealthy family with a little fat pig in his arms: “Zaizai is a big eater, I can’t feed him. Zaizai’s primary school homework is too difficult, I can’t do it. I’ll give you guardianship from now on! Will you let me go to your construction site to move bricks? Son, say ‘Mommy’!”

Mr. Qin: (No, I couldn’t give birth to such a fat kid!)

Later…

Onlookers: I heard that Mr. Qin has adopted an illegitimate child born to his old lover by some woman?

Mr. Qin: Let me introduce to you, this is my own cub!

- Description from Novelupdates

The simulation is over, and the entry is obtained: a showdown!

Looking at this entry, Zhao Meng was stunned.

“How should this term be used?”

“Hey! Here’s a wounded fox!”

…

A few years later, a woman who looked like a fairy appeared in front of him, and said:

“My lord, I’m here to repay my favor!”

This book is also called “Starting from Transforming Monsters”

- Description from novelbuddy

Hunted for the Alchemical Book in her hand - Mu Ruyue wakes up in the body of a wastrel in Shenwu Continent - a martial arts dominated world.Her fiancé has jilted her in favor of her foster sister.Her father condones her abuse.Her younger sister wishes she was never born.And the whole country ridicules and insults her for being a first-rate wastrel.Wastrel? Not at all. With the Alchemical Book in her hand, what pills and elixirs can't she refine?Jilted? She'd rather marry the pure and innocent Ghost King, Ye Wuchen.----Mu Ruyue: Stop calling me Sister!Ye Wuchen: Can I call you Wife then?Mu Ruyue: Not that either!Ye Wuchen: (about to cry)Mu Ruyue: (sighs) Suit yourself.Ye Wuchen then leans forward and kisses the corners of her lips.Mu Ruyue: …Did a child just steal her first kiss?----Brother 1: Let her go!Brother 2: She is my mother, why should I let go of her!Brother 1: Don't ever think of robbing my mother!Mu Ruyue: Let me introduce you, Jing'er, this is your younger brother. Huang'er, this is your elder brother.Huang'er: Mother, this stupid boy bullied me. He's not my brother.Jing'er: Little guy, from now on, you must listen to me.Ye Wuchen: (How exactly do these two regard him? They dare fight over his wife in front of him...)