Raising a Vampire Little Brother Is Dangerously Wild

[Mutually exclusive devotion + yandere + vampires + forced love + captivity + older woman/younger man romance + childhood friends + sweet with a touch of angst + mutual salvation + no rivalry between women + devoted couple + happy ending]

Black-hearted yandere vampire younger brother × gentle, healing human older sister

“You promised to take care of me. How can you give up halfway?”

To pay for her mother’s medical bills, hematologist Bai Li signs a contract with the mysterious organization Tianqi to care for problem child Li Yuan until he comes of age.

The corruption monitor on his wristband shows that he has remained stable for six years.

Just when she thinks she has raised him into a well-behaved younger brother, he corners her behind a door on the night he comes of age, the color of blood spreading through his golden eyes.

She thinks he is merely the “problem child with antisocial personality disorder” described in his file. Then he slowly unfurls his pitch-black wings in front of her and casually crushes the hand bones of the man she was set up with.

Only then does she realize that the boy who has been by her side for six years isn’t human.

Bai Li: “...So what exactly do you want?”

Li Yuan lowers his head, his thin lips resting against her temple. His voice is as gentle as it was when he was a well-behaved boy six years ago:

“I want your warmth to belong to me alone! If anyone else so much as looks at you, I want to gouge out his eyes!”

He pauses, then looks up, a smile filling his golden eyes. “I was born for you alone!”

(This is not a transmigrate-into-a-book story and has no System. The female lead is a hematology specialist, brave and resourceful, not a naive damsel.)