Here comes an interesting F/f spanking DVD titled "懺悔地獄 スパンキング" (lit. a hell of a confession and a spanking).
In this movie,bad girls are spanked enough and it gives them sore red bottoms according to what DMM says.
And based on the pics below,
I guess most of them are punished mainly by an OTK spanking!
This DVD,to my sorry,seems to be NOT sold internationally and I can NOT find sample movie so far...