From Spanking Art

Lilith is an author that specializes in F/F and M/F adult spanking stories. She is also the webmaster of Naked Oblivion, a free site that features her stories.

Note that Lilith uses a different abbreviation system on her site, where an upper case letter stands for dominant and a lower case letter for submissive. So when she writes "F/f", for example, she means the spankee is a female adult submissive, not a minor female.