“I’m not a child anymore, Mycroft.”

This just broke my heart. Sherlock always saw himself as a child in the eyes of his brother because he thought Mycroft saw him as petulant and slow. But the truth was that Mycroft saw him as a child because he never stopped protecting him. He never stopped worrying about him, and he never stopped believing his brother would need him. No matter what, Mycroft would always be mother.