The Grand Secretary has no heir? His concubine gives birth to triplets.

[The Scheming Concubine X The Crazy and Flirtatious Prime Minister] (Ancient BJD Raising Guide + Mind Reading + Double Identity Reveal)
The Grand Secretary Pei Yan held immense power in the court. He was over twenty-nine years old, yet died young without an heir, and was devoid of human emotions and desires.
He suffers from severe mysophobia, is cold-hearted and indifferent, and treats all the noble ladies in the capital as if they don't exist.
Only Jiang Guo'er knew just how "unreasonable" this unapproachable Grand Secretary was on the bed.
With her family destroyed and her loved ones killed, Murong Shunshun, the daughter of a disgraced official, goes by the alias Jiang Guo'er and infiltrates the Prime Minister's mansion as a concubine, claiming to be a member of the Wu Jiang clan with a "fertile constitution." She hopes to use Pei Yan's power and intelligence network to avenge her family!
However, after a month in the manor, she hadn't even seen Pei Yan's face.
The harsh winter was unbearable, so she picked up an exquisite silk doll to use as a heater.
When she was cold, she would hold the doll in her arms and knead it; when she felt wronged, she would kiss the doll's lips; at night, she would press the doll against her softest spot to warm herself.
But she didn't know—
This doll shares the same feelings as the Grand Secretary.
With each rub, the Grand Secretary's body burned with heat, his eyes reddened, and a terrifying passion stirred in his usually cold eyes!
Later, Jiang Guo'er got her revenge and packed her bags, preparing to escape and die.
But at the city gate, he was held down tightly by a man with bloodshot eyes.
He held her tightly in his arms, biting her earlobe, his voice cold and obsessive: "The Pei family has few offspring; many children bring many blessings... You think you can just run away after you've had your fill, Madam?"