The Light in Darkness

One-Shot. John Watson meets a bizarre boy on the Hogwarts Express, and he can't help but be pulled to him. Implied Johnlock, and mild angst. Rated K for brief language. For Butteredtopcorn in the Sherlock AU exchange on tumblr. This is really more of an AU than a crossover, though I have marked it as a crossover because it just makes more sense to me. Enjoy!