Kissing Sherlock Holmes

I've missed Holmes and Watson as I haven't read the books or any fanfiction in years, so it was a nice homecoming of sorts for me. The basic characterisations of these characters is close enough to classic Doyle to elicit no complaint with a decent case as the main plot focus. The main issue I had was that, at the very outset, there is no physical relationship between Holmes and Watson but by the first chapter, they are very suddenly thrust into one that felt out of nowhere. Holmes merely asks for a lesson in how to woo including kissing from Watson, and then a mere paragraph later Watson has Holmes up against a tree in a full-on snog. Obviously, those reading this book are mostly here for that very thing but I was hoping for a more natural progression, definitely more angst and second-guessing from Watson. Here, once they start with that (very out-in-public) kiss, they can't keep their hands off each other and that very afternoon, in Chapter 2, Holmes is already on his knees... it just seemed very unexpected for the era and these characters. If this was just some fanfiction on A03 I wouldn't even blink at this, but because the writers went through the trouble of publishing it I expected more polish and thoughtfulness.