Dear Diary,

Engaged! Me! Engaged for the first time, to the man who looks like the most adorable basset hound in the world. I'm so happy I could die.

But there's something I had to do, and I knew it.

That's why, the afternoon after I got engaged, I put myself into a taxi and rode to Mycroft's flat, that place I never go unless I have to. I knew he would be home because I called his secretary to make sure. She would certainly tell him I had called, but I didn't care.

This time, Mycroft let me in instead of his housekeeper.

As soon as I saw him, I wanted to cry. I'm not much of a crier, you know, but with all the scary and sad and happy and relieving things that had been happening over the previous few days, I realized I actually had tears in me that wanted to come out.

Mycroft looked down at me in his appraising way and did something Sherlock never would have done.

See, Sherlock would have seen that I was going to cry and either left or started talking—telling me why I shouldn't be upset, all the reasons to keep calm and carry on, or tried to distract me with something like theoretical physics. (Some day I'll have to write up the story of the day my first boyfriend broke up with me and Sherlock tried to teach me about organic chemistry.)

Mycroft didn't do any of that. Instead, he pulled me close and let me cry in his arms. In that moment, he was my big brother again—taking the blame when Sherlock and I made our father angry, holding me the day my mother died, finding me and carrying me home when I got drunk and lost as a teenager—the big brother who was doing it again, forgiving me so easily for thinking the most unforgivable things about him.

After a long time of him holding me and me sobbing like a wreck, he took out his handkerchief and wiped my eyes. "Congratulations, Sarah. I understand you're going to be Mrs. Watson." I could tell he was pleased, and I was glad.

I told him I loved him then. I felt so awkward saying it I thought I might spontaneously combust, but I didn't. Mycroft showed me out of his flat in a kind of daze, both of us grinning from ear to ear, and I felt really good on my ride back to the clinic.

Back to the clinic where a smile and a jumper and the most wonderful man in the world would be waiting.