STing vs slash fiction

STing

noun
  • Storytelling in the context of a tabletop role-playing game, especially one published by White Wolf. 

slash fiction

noun
  • A work in the genre of slash fiction 

  • A genre of fan fiction focusing on romantic and/or sexual relationships between characters of the same sex (typically men). 

How often have the words STing and slash fiction occurred in a corpus of books? (source: Google Ngram Viewer )