How spicy are Penelope Douglas' books?

smutrecs.com has rated 2 books by Penelope Douglas: Credence (5/5) and Misconduct (about 3–4/5).

1. 
   Credence spice 5/5
2. 
   Misconduct spice about 3–4/5

Each book page lists the sources behind its ratings. Ratings marked "about" are estimates. How we rate