play with vs treat lightly

play with

verb
  • To trick. 

  • To sexually stimulate a person or a person's erogenous zone. 

  • Used other than figuratively or idiomatically: play with. 

  • To fiddle with; make small adjustments to, for example to something mechanical in order to improve its performance. 

treat lightly

How often have the words play with and treat lightly occurred in a corpus of books? (source: Google Ngram Viewer )