Criminal - Britney Spears Song One Shot! (this is my first song one shot. So the background before the story will be kinda confusing. So don't freak out if dates/ages are weird. I really like this storyline so...)
Background- one night a drunk Sherlock Holmes met a drunk Irene Adler. We all know how that ended. In bed. Which resulted in of course a child. Five years later the events of A Scandal In Belgravia took place and Sherlock met his daughter (Y/N). He instantly fell in love with his daughter. She looked like her mother but was smart like him. A while later Irene and Sherlock married and (Y/N) finally had her father.

But Mama I'm in love with a Criminal
Another couple years later we are in the present and (Y/N) is 18 and rebellious. One day she meet a man. A glorious, sexy, dangerous man by the name of James Moriarty. Moriarty was attracted to her beauty. She was attracted to his as well. After the first meeting they would 'accidentally' meet up in the streets. Accidentally as in Jim planned it so he could brush against her walking down the path or getting out of a cab while she entered. Finally she stopped him one day and from there it's history.
And this type of love isn't rational it's physical.
Of course she never told her parents of her relationship. Not only was she sleeping with James Moriarty but there was an age difference. And of course he cause her to change. Her voice, her words, her appearance, everything.
He is a villain by the devils law. He is a killer just for fun fun fun fun.
He's Moriarty. He's a killer. And he made (Y/N) a killer. She wanted him and to be with him she had to be like him. He was a villain and so was she. He made her the perfect girl for himself. (Y/N) was addicted and didn't want to come clean.
Mama please don't cry, I will be alright. All reason aside, I just can't deny, love that guy.
Finally came the time for (Y/N) to choose. Her family or Moriarty. She was 19 and in love with this Devil. But could she leave her family? Not only Sherlock and Irene. But her younger brother and the Watsons. So came the day. She decided. She chose. Sherlock and Irene returned home to find their daughter's belongings gone and (Y/N) standing in an empty bedroom. "Don't tell me you don't know what's going on! Haven't you figured it out? The men's cologne on my clothes. The marks on my jawline, neck, collarbone, and other places. The way my voice has changed. My clothes. My attitude. The way I leave and enter the house at any hour of the day or night." She couldn't tell if they were in shock, thinking, or still didn't have a clue. "Seriously it's so simple! I'm sleeping with James Moriarty. I'm living with Moriarty. So goodbye Mummy, Daddy. I do love you." She smirked and strode past them to the waiting black car.