Well...I'm personally glad you didn't write the 3-some...even if it is only because of the complexity :-)
If H/W is to occur, I imagine it would be Watson's style, meaning he would not give us the details - at least I can't imagine him writing pr0n :-) But just like you did with his snarry observation, he conveyed a lot of emotion... The way you wrote that fic is, you gave H/W the foundation, as well as the opening for sequel(s)... I know I said this 6 billion times, but I just love that fic to pieces... and your Watson is like the real, Doyle's Watson, yet better, more lovable! ^_^