come on to vs implore

come on to

verb
  • To make a romantic or sexual advance to. 

  • To start to. 

implore

verb
  • Often followed by for (a thing) or of (a person): to express an earnest or urgent plea. 

  • To beg or plead that (someone) earnestly or urgently do something; to beseech, to entreat. 

  • To beg or plead for (something) earnestly or urgently; to beseech. 

How often have the words come on to and implore occurred in a corpus of books? (source: Google Ngram Viewer )