Mr Warren's Profession

There's a lot I like about this book, even though it turned out very different than I was expecting. I was expecting a standard light historical romance and what I got was:

An examination of class differences
As well as the complications of a romance between those of class differences
A virgin hero
Two smart young men falling in love
An engagement of convenience
(That totally isn't but I could easily see turning into a poly relationship)
Queer supporting cast
Lots of drama
But little drama from the couple
In fact, they usually face the drama side-by-side
Not a slow burn (except in the length of time that actually passes in the book)
But a slowly built romance, with a lot happening between the couple besides just sex