Erotic Ghost Story
Once upon a time, there're three sisters who happen to be vixens. So So, Fi Fi and Fa Fa have been doing everything good and assumed the shapes of girls.
They're to become immortal deities if they keep on doing the right thing. Unfortunately, they fall in love with a young handsome scholar one by one. But they finally find out that he is notorious devil of lust Wutung. Sex keeps Wutung young, at the expense of his bed partners, though. So three girls discover fox hair has come back to their bodies.
Luckily, a demigod comes to help them out. The vixens are told to behave. They still have a claim to immortality.