Your Sherlock as always is awesome but your Mycroft is absolutely superb. You capture him so well in that he's still officious Mycroft but with an underlying warmth and love for this sibling.

“Emotions aren't logical.”

“Yes, I believe I've learned that the hard way,” Sherlock said, with a bitter little laugh.

“That's the way you've always had to learn everything,” Mycroft said.

I adored this exchange. It's so simple and yet I feel like you learn LOADS about Sherlock's personality from even when he was little.

Wonderful fic, m'dear!