The Rat Spirit

A little story inspired by a sudden idea:

The rat Qian Yu accidentally let go had already become a spirit.

It took human form and entered Qian Yu's dreams.

They did unspeakable things together.

Then it showed up in his everyday life as well.

Can a human and a spirit truly sustain a physical relationship?

(PS: All names, company names, and so on in this story are fictional. Any similarities are purely coincidental.)

Theme: Once you choose someone, it's forever.