How spicy are Leigh Rivers' books?

smutrecs.com has rated 2 books by Leigh Rivers: Little Stranger (5/5) and Voracious (about 3–4/5).

1. 
   Little Stranger spice 5/5
2. 
   Voracious spice about 3–4/5

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