The Natural Conclusion of Things
Now, I wasnât exactly looking for a blatant confirmation of a romantic relationship between Sherlock and John, but it seemed logical for it to appear, particularly after The Lying Detective.Â
If you put a rifle on the wall in scene 1, it has to get fired before the end of the story. Announcing that John and Sherlock both need a romantic connection in The Lying Detective is one such rifle.
I wasnât expecting it to be obvious, and itâs not, not entirely, but yeah, itâs there.Â
This episode isnât about Sherlock and John and a change in their relationship, to be clear. Itâs about why Sherlock is what he is. But slid in there is the assumption that Sherlock and John are back together, the way they havenât been since The Reichenbach Fall, but this time with eyes wide open. Theyâre together and talking this time, thatâs where we left them with The Lying Detective. They are finally, finally talking to each other about their feelings in a way they never did before. This story doesnât address those steps directly, it certainly addresses them obliquely.
First: Mycroft wants to talk about their sister alone because âItâs family.â John stays in the conversation because Sherlock wants him there for the same reason. Sherlock considers John family. John considers himself family as well; they are in agreement about it, and John doesnât offer to go, or move to step away. On its own, thatâs a lovely sentiment shared between them, but what it suggests is that John is not only his friend. Thatâs nice, but only the first part of why I think theyâve moved their relationship to a new place.
Second: Eurus hears Sherlock play one note on his violin and knows that heâs had sex. Thatâs news! Whoâs Sherlock having sex with? Eurus assumes itâs a woman. Thatâs the same kind of mistake Sherlock made in  A Study in Pink. But who else would it be? Itâs John.
Third: when John finds another DVD left by Mary, he doesnât watch it alone. Sherlock needs come over to watch it with him. Sherlock is fully engaged in Johnâs emotional life at this point, just as John is fully engaged in Sherlockâs, family and all.
Most of this story is game face time, so other than a shot of them co-parenting, and them physically putting their lives back together at the end, there isnât time for them to show much more. Except thatâs sort of the point: they are working as a unit through this whole story, a truly complete unit. They are at peace with each other, they trust each other, they know each other. There is not a flicker of doubt left about each other.
Nothing will ever come between them again.