well, I definitely think they're in love, but not necessarily sexually. I don't have anything against people drawing/writing s/j slash, because, hey, anyone can think what they want But for me, even when you put aside the fact that canonically John isn't gay, and Sherlock is assumedly asexual, I can't see them ever reaching the point of a sexual relationship. Emotionally? Close. Maybe not even, though. Sherlock's character is too stoic, too guarded and eccentric. I don't think he would ever submit to such human situations, really... That's just my opinion, though.