Elementary

God. It kills me, because (Joan) Watson’s deduction skills are getting so good, and Sherlock is slowly realizing that she’s beginning to do the same as him, and follow him. Because at first, she was just

supposed to watch him, right? She didn’t have to take part in any of these cases or help him out, but she does, because they’re becoming closer, and she trusts him, and he trusts her. And that’s the beautiful thing about their relationship.
It's amazing how their relationship has progressed. They overall trust each other more, and I think what they're building is not only a romantic relationship, but also a healthy relationship/friendship as well. It was all said without words in the episode in which Joan asks Sherlock's father to stay and he says no, but she stays anyway, because she can't imagine her life without him.