One Piece: Madness of Regret - Chapter 15: He was me(1)

Seven years ago, Shen Qianshu is impregnated with Ye Ling’s child in an accident.
Seven years later, the little boy becomes famous and is thought of as the nation’s son.

When he suddenly sees Ye Ling appear, he greets, “Hello, Daddy?”
Ye Ling watches as the little prince roars, “Where’s my princess?”
Just as Shen Qianshu is preparing to run with her son, she gets pushed down by Ye Ling.

“You can leave if you want, but leave me a princess first. Let’s have another baby!”

- Description from Novelupdates

When The Cute Kunoichis Spied on Their Teacher's Secret is a light novel written by Kazuma Kamachi and illustrated by Ryuushi Tajima.

The story takes place in a world where Japan never ended their isolationist phase, and agents from foreign powers are always threatening to steal the country's advanced technology. In order to combat this threat there has been a resurgence of ninjas that use Strategic Martial Arts, techniques that combine cutting-edge modern technology with a traditional foundation of martial arts and ninjutsu. The story follows Souha Sugiyado, a 17-year old ninja instructor and former ninja prodigy who was forced to retire from active duty by the wounds he suffered in his last mission. Souha's four students are all kunoichi who have all gained the rank of Elite Ninja, the highest official rank available to ninja. However, one day two Shogunate ninja approach him with the news that his four students have gone rogue and have stolen a portable modular nuclear reactor, and thus they ask for his help in bringing his students to justice.

You feel your strength is insufficient, Strength +1.You have practiced the Golden Bell Shield, Martial Arts Level +1.You have picked up a volume of Taoist scripture, Understanding +1.Your opponent is extraordinarily strong. The Golden Bell Shield has reached Great Perfection. You combined the Golden Bell Shield, Iron Cloth Shirt, and Thirteen Cross Training, all +1, and mastered the Vajra Indestructible Divine Skill. Your opponent's knife cannot harm you and is utterly devastated. ...

Four years ago, after a night of drunkenness, she had a relationship with a stranger and fled in panic upon waking up. Four years later, she returns with a soft, cute little bun by her side.“Bad uncle, you're not allowed to bully my mommy!”The man looked at the little bun, who was not even tall enough to reach his waist, and gave a charming smile. “Shouldn't you ask your mommy why you look exactly like me?”