What I loved about this was how happy Sherlock looked when he turned his head to look at John standing there. Especially because, since this is Sherlock’s headspace, he put John there. (I mean he might’ve been standing right next to him in the real world, too, but that doesn’t mean Sherlock had to notice him.)
It kind of reminded me of getting a knock on your door and opening it to find your bestie whom you haven’t seen in a year. You kind of just scream with joy and drag them inside, and then grin at them stupidly from your side of the sofa every couple of minutes.