My Older Brother Is a Cat

Cat demon (Fang Chiyu) as the top, Fang Hui as the bottom?

The summer before Fang Hui started high school, his parents finally persuaded his grandmother, who lived back in their hometown, to move to the city and live with them.

When they returned to their hometown to help Grandma move her things, she pointed at the big white cat in the courtyard, already more than ten years old, and said earnestly, "Huihui, people should repay their debts of gratitude. Your older brother saved your life when you were little, so you have to look after him until the end of his days. Understand?"

Fang Hui, who believed in repaying kindness, nodded. Calling the cat Kitty, he bundled it up and abducted it along with Grandma's things to their home in the city.

With the thought of repaying the life-saving favor by caring for Kitty until the end, Fang Hui diligently looked after his big brother Kitty. But as he cared for the cat, one day it transformed right in front of him into a boy about his own age.

Looking at the cat before him, Fang Hui said helplessly, "Who knows which of us will be looking after the other until the end?"

The cat demon, now successfully transformed, suggested, "Since you can't look after me until the end of my days, how about you consider giving yourself to me instead?"

Theme: Repay a life-saving favor with overflowing gratitude.