Finish her off, Ran. You know that you want to.

This is one of those "walk into the room and feel death up your spine" moments.

First thing I thought of, was post #238497.

Maybe it's a misunderstanding and she's sucking out poison or something? Like in the Sherlock Holmes story "The Sussex Vampire."

Ran has just three tails here. Perhaps it was a fetish she grew out of later?

or alternatively this could be a part of the long-forgotten Vampire-chain...

Youkai are so unpredictable~

Go back to sleep, Chen.