butter someone's biscuit vs tickle someone's fancy

butter someone's biscuit

verb
  • To interest or appeal to someone; to make someone happy. 

tickle someone's fancy

verb
  • To amuse, entertain, or appeal to someone; to stimulate someone's imagination in a favorable manner. 

How often have the words butter someone's biscuit and tickle someone's fancy occurred in a corpus of books? (source: Google Ngram Viewer )