Hmm... Tease by Resmiranda. Mind you, I've read probably fifteen or less fanfics all the way through and not too many more even partially through. It's kind of fitting that my favorite would be a one shot.
I think I like it, because even though it's not particularly deep (It is a lemon after all), it is meatier than most stories of this type. I really like the questions and answers it presents about self-esteem and about having courage in one's sexuality.
It just sort of works in a realistic fashion.
Aside from Sesshoumaru (you biased fangirls
), what male character from Inuyasha must have the best physique? And why? (Remember no Sesshoumaru!)