crack onto vs fascinate

crack onto

verb
  • To flirt with; to approach and speak to (someone), seeking romance, love, sex, etc. 

fascinate

verb
  • To be irresistibly charming or attractive to. 

  • To evoke an intense interest or attraction in someone. 

  • To make someone hold motionless; to spellbind. 

How often have the words crack onto and fascinate occurred in a corpus of books? (source: Google Ngram Viewer )