The Mad Scientist and the Humanoid Weapon

Chu Shuqiu was a bona fide mad scientist. He called the weapons he delivered to the Operations Department "little fireworks," and when the department's staff used them, they witnessed the most spectacular explosion of their lives.

Allen was the most perfect creation of Chu Shuqiu's life, a human weapon made for war. But Chu Shuqiu was a madman. He said, "I've finished making the knife. There's no need to socialize it. That's a sociologist's job."

Until one day, Allen came straight from the battlefield and, covered in blood, blocked Chu Shuqiu's way. Chu was still wearing his lab coat. Allen asked him earnestly, "Master, what is sex?"

Later, Chu Shuqiu squeezed his eyes shut and tried to kick Allen away. His voice was hoarse. "Stop."

Allen reached over to pick up the watch by the bed, glanced at it, and said calmly, "You said the human average is three hours and forty-eight minutes."

Chu Shuqiu: "..."

When Allen fell in love with Chu Shuqiu, he stared at him helplessly and pointed to his own heart. "Master, it... it keeps beating. Why?"

Chu Shuqiu told him, "That feeling is called falling in love."

A self-destructive mad scientist on the receiving end X an inhuman attacker with no social awareness

P.S. Chu Shuqiu made up the average-duration figure off the top of his head to fool him.

The characters' names may change. Thanks for adding this to your collection.

Theme: Loving someone can heal you, too.