Forgotten Lullaby (Harry Potter FF){Remus x OC x Sirius}

"You will always be useless!"
"One cut, two cuts, three cuts, four. Another insult, another cut."
"You can come out now."
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All her life she's been hurt. She knows she's a purblood. She knows she has extraordinary powers. She knows she's a freak. She has been abused all her life and no one comes to save her. Instead, without even knowing what she's like, people treat her as an outcast and looked down upon daily. People don't even know what house she's in. Well, then again, she's not in just one. She's found, if you look for her outside sing her favorite song. Her forgotten lullaby.
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Trigger warning:
Self harm
Abuse
Mental illness
Cutting
Rape