Well, I'm halfway through all 221 of these! I hope I can find the strength to finish. I figured for such an important milestone in my drabbles, I needed an important milestone for John and Sherlock as well. I also wanted to see if I could do something fluffy and cute with the word "brain". Hah.
For reference to what music is playing at the beginning, please read my short ficlet called "Thaxted".
The familiar strains of Holst piped out of the discreetly hidden speakers and John fussed nervously with his tie for the hundredth time today. Sherlock grinned at him, confident as ever, and adjusted the collar John had knocked askew. The registrar smiled at them both, clearly familiar with wedding-day jitters.
Most of the service passed in a blur, John too giddy to hear what was going on. Molly was recording everything on camera, so he could come back to it later. Eventually it came time to exchange vows, and John found himself worrying that maybe letting Sherlock write his own wasn't the best idea.
The look on Sherlock's face as he turned to John was so genuinely earnest, so warm, that John's concerns melted immediately. He smiled up at the man who'd become everything to him, feeling the heat on his cheeks.
"John Watson, before I met you I was convinced that I didn't need anyone - convinced that anyone around me would just drag me down. Somehow, you limped into my life and showed me how wrong I was, and for that I am incredibly grateful. I can only hope to stay with you for as many years as you can put up with me. I love you, and you will always be the kind, understanding heart to my brain."