I have to say, this has been one of my absolute favorite Sherlock fics in ages, and probably the best 'Sherlock through the years' type I've read ever.

Mycroft cares very deeply for his brother, always has. He'll do whatever it takes to make sure Sherlock is safe, even if Sherlock has been a stupid idiot. I get that. I have a younger brother that is currently driving me round the bend and you get to a point where you've done all you can do and then it is up to them to fix things themselves because you can't make them do it. Try it and it will backfire.