Mills-and-Boon vs sappy

Mills-and-Boon

sappy

adj
  • Having (a particularly large amount of) sap. 

  • Excessively sweet, emotional, nostalgic; cheesy; mushy. (British equivalent: soppy) 

How often have the words Mills-and-Boon and sappy occurred in a corpus of books? (source: Google Ngram Viewer )