I've been thinking about this all day. And most of the night.
I'm not that good with words - not serious ones. Fine with being silly - fine making up rhymes. But serious is difficult. So I think simple is best.
I love you, John Watson. I feel so lucky to have you in my life. I want to grow old with you. I want to spend the rest of my days with you, and with Mycroft and Sherlock as they grow up.
To share life with the three of you is an honour. Thank you for making me feel like it's one I am worthy of.