(spoilers for Reichenbach, and in the following description)
Occasionally fanworks make me get a lump in my chest. Very occasionally I get truly teary-eyed. (I'm setting aside the more common case where I'm upset about something else and the fanfic or art or whatever is the straw that breaks the camels back.) But this piece moved me past those stages into flat-out crying, hard enough that I had to set down the drink I had in my hand at the time because I was about to spill it all over my keyboard. There's something about it that just hits you at a visceral level. I think it's the combination of being prepared to take some degree of punishment and realizing there's no way he can take this own pain on himself, and the way Sherlock's deductive side drives home the true cost of what happened on the rooftop of St. Bart's.
Whatever the reason, this fanart literally hurts to think about, but in the best way possible. I think the fact that moments like this make sense for the BBC version of Sherlock (and I'm really not sure they would, or should have to, for Doyle!Sherlock) that drew me to this show from the beginning. There's a part of me that feels like I'm too logical, too divorced from the emotional reality most people live with, and seeing Sherlock trying to claw himself a bit toward that: it may not be how I always imagined Doyle's man of iron, but there's something very sympathetic about all that.