Alexandra "Alex" Watson is the younger sister of John Watson. She comes to stay with him and Sherlock Holmes after escaping from her abusive boyfriend. Slowly, but surely, the two of them become closer. And maybe, just maybe, there's something there that wasn't there before. Disclaimer: I own nothing except for Alex, David, and maybe a few more things that will pop up later. Sherlock, John, and everything/one else belongs to Steven Moffat (MOOOOFFFFAAAATTTT!) and Mark Gatiss.