Rome (Wild Kings)

Trapped in a cage all his life, experimented on, tortured, Rome and his brethren are cold, deadly, emotionless and ready to kill those who have imprisoned them. Taught from the beginning that all humans are soulless bastards who enjoy their pain, they have waited patiently for their chance to get revenge. Day after day, Rome has to listen to the pain and torture of those closest to him, enduring the experiments and torture that his captors put him through, waiting for the right moment to strike. Being their leader means he can't show any weakness, he can't risk trusting anyone. But what happens when he meets his match one day in the surprisingly gorgeous, genius, and oddly secretive new young doctor who has come to the compound to observe and interact with the Beasts, as they are called.
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Reese Mackenzie Parker has seen and done everything in here lifetime, and nothing seems to phase her now. It is said she has no emotions, and people are almost right. There is nearly nothing that can get a reaction from the stone cold assassin, on the inside much less the outside, however, the horrifying things that are going on at a top secret government facility cause such a violent reaction inside her soul, she wants to destroy the people responsible. And that is what she has decided to do. With her many degrees in genetics and bio engineering, her above genius IQ, and her powerful contacts, she gets herself a new job as a "trainer" for these "Beasts". But when she goes in for the first time, and she looks into the eyes of the wild, dangerous creature, staring at her, she didn't expect to have felt the first real emotion besides disgust and anger, in years.
She didn't expect to find the one person, who could make her weak; who could make her feel again.

He didn't expect to find his Soul in one of the people he has sworn to get revenge against.