Demon King & Hero - Chapter 9-3:

Mimizuku, a small girl with chains on her wrists and ankles and the numbers “332” branded onto her forehead, wanders into the Forest of Night seeking to be eaten by a monster. However, when the ruler of the monsters, the mysterious and beautiful “King of Night,” refuses to eat her, she tries to formulate a way to convince him otherwise.

This novel is also known as Mr. Mayor Please Be Kind

She is an old spinster of average status. He is young and powerful, achieving status as a high ranking official of River City within a span of just a few years. She had a deep love, but being unable to endure the harsh reality of life, she left. He had also loved once before, but he had been suffered betrayal from his girlfriend and friends, he delayed his marriage.

Having exchanged a few coincidental glances with him, she mistakenly assumed him to be her blind date, and without asking any other questions, she directly inquired him: “Do you want to come with me to get a card (marriage book)?”

He recognized this woman, and holding her with a feeling that was neither love nor hate, pleasure replacing surprise, he nodded: “I’m free in the afternoon!” He had not corrected her.

As per martial business, she offered him an agreement, calmly stating: She will agree to roll the bed sheet once a week! He quietly raised an eyebrow, mouth half-smiling, and flamboyantly signed his name. So because of this agreement…

“Wife, it’s late, let’s get some rest,” the man stated. The woman looked in to his eyes, nodded, and turned off the bedside lamp. In the darkness, a pair of large hands probed into her clothes, caressing her skin like satin. It was a beautiful night.

On the second night: “Wife, it’s late, let’s get some rest, ” the man stated. The woman looked in to his eyes, nodded, turned off the bedside lamp and lay down to sleep. His dark, large hand reached up to her again and slid into her clothes, probing her smooth skin until it was then suddenly caught.

“What are you doing? ” the woman asked coldly.

”There is a marital agreement to fulfill! ” the man said, take it for granted, and then pressed on top of the woman. It was a spectacular night.

The next morning, the woman who was brimming with an aching waist and grief, came out from the study room with eyes wide open, angrily said: “Su Yicheng, you crafty Official!”

The agreement read: marriage, rest once a week!

Love after marriage, warm and spoiled.

- Description from Novelupdates

After the final high school exams, Zheng Qing didn't go to the long-desired Imperial University. Instead, he packed his bags, hugged his fox, followed an enigmatic notice, and ventured into an unknown university.Here, there was no advanced math, English, or political philosophy; they were replaced with divination, astronomy, and the philosophy of magic.Extracurriculars here involved demon hunting,And the hobbies were curious and diverse.He would sail the sea of learning and climb the mountain of books.This bewildered young man started his tumultuous journey as a wizard.(Group created: Six Two Three Eight Five Eight Nine Three One, you're welcome to join.)

I became a mage character from my favorite game.