God, I love it when his face does that laser-eyed, snarky, mocking thing. He’s suspended halfway between sneering and concern here, and it’s SO HOT.
It’s sweet and pathetic and hilarious that this is his attempt to comfort John. Equally sweet and pathetic and hilarious is that John seems to be pretty okay with it. At this point I can only surmise that as long as Sherlock is staring at him like he’s the only thing in the room and telling him that it’s okay, John’s content to accept that Sherlock’s got it all handled.
Mycroft’s right; that’s a lot of trust to put into a lying, manipulative bastard. XD