Smoldering hot. Bertie has got the slow burn down pat and poor Arthur is about to self-combust, and he's not alone. This is flirtation taken to the torture level; I think I held my breath for a good portion of the book.Dear, precious Arthur. Bertie might be too considerate for such a shy soul, I know I wanted to bind them together until they finally resolved the tension. I had to be patient, which I despise, but eventually I was rewarded. Mercy.This book requires hot chocolate and a good blankie to truly appreciate.