Is This Real? -Sherlock Fanfic (xOC)

Fresh blood was the only smell left in the air. Or should I say blood that was 6 hours 27 minutes and 4 seconds old. Sherlock Holmes didn't even have to be called by Lestrade to know this was a case perfect for himself. As he entered the house, freshly painted red with the victims blood, He froze. Even though he was surrounded by nothing but red your (c/h) was all that stood out to him. Who was this mysterious girl? Why was she standing next to the victims body examining it? A job that belonged to Sherlock. And why was he unable to move?
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After spending years in America at Saint Anne's Hospital to better your mental health; you've finally decided to return home. Missing your big brother John Watson also played a large role in your return. You were excited to jump back into your career as a detective. Solving crimes is something you've been itching to do like a bad drug habit.
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How will you survive your life back in England after being gone for so long? Will your job pose as a threat to your mental health? Will you be sent away by your brother again? And who is this obnoxious man I'm a trench coat who is oddly attractive?

Warnings: possible smut? Mentions of mental health (depression, suicide, anxiety, ex) Blood, Death, Violence