We Were Monsters (фемслэш)

The life of an FBI agent was far from glamorous. She saw the dark underbelly of humanity. Studied crime scenes that would churn your stomach. Interviewed people who felt no shame or fear exacting terrible pain on others, or worse. It was always just another day at the office. But all it took was one case—one serial killer far too close to home—to set her entire world on fire.
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Gifted. Exceptional. Certified genius. The kid who started college at 10 years old.
…Macabre. Weird. Conceal, don't feel. The mantra repeated in her head did nothing to quiet her dark urges. Neglected by her mother and physically abused by her father throughout childhood. Rejected by her sister in adulthood. After suppressing her urges for years, she gave in. It was only supposed to be one. She’d only wanted a taste. But then she couldn’t help herself. Her victims were all substitutes for the one person she couldn’t have, and she couldn’t stop.
Until she was caught.
Two sides of the same coin. Cut from the same cloth. Like peaches and cream, they belonged together. But they couldn't have been more different. Or more destined. Look in the sky. It was written in the stars: their alignment would shatter the world.