The Opposite of a Kitsune Reveals One Inconsiderably in this Japanese Web Comic
 

http://www.comic-ryu.jp/_kuzurechan/comic/10.html#6

In this page, the main character forces a Kitsune to reveal her form to her to get the MC to understand her reasoning for hiding her true nature unlike her.

The Webcomic(?) in general is about a Yako, I think, the darker more ghostly version of a kitsune that is technically more dangerous than the usual depiction of a kitsune. Anyway this Yako falls in love with a boy her size and gets both of them into trouble with the Youkai with her crazy ghostly antics as she tries to get close to the boy and her failure to understand the need to hide herself from humans.
http://www.comic-ryu.jp/_kuzurechan/index.html