He who makes a beast of himself gets rid of the pain of being a man.
Ch.1 - Cas and Meg
Cas didn't like killing at first. Every fiber of his being screamed at him to stop Meg from shredding their victim apart with a knife, but he never did. After a while, he got used to it. Hell, sometimes he would even join in. He began to understand Meg's lust for blood more. The exhilaration he experienced during the killings were intoxicating. It almost became addicting to him. He loved listening to the choked cries for help, mercy, or any sign of humanity. Their pointless wishes were only met with maniacal laughter. It had been a few months since Cas was fired, and sought out the infamous serial killer Meg Masters. She was beautiful, deadly, and nearly invisible.
Cas had been a cop under the command of police chief and his adopted father, Robert Singer. Bob was killed in the line of duty by an infamous savage named Sam Winchester. Dean Winchester, the new police chief, tried to pin the whole thing on Cas. Lucky for Cas, all he lost was his job. However, that was enough to break him.
That's when he found Meg. The police had been on her trail for a while now, and in return for her help he stowed her away, hiding her from the vicious gaze of the law. Meg was happy to comply. In fact, she enjoyed it a bit. She had a big, strong, ex-cop on a leash who would do anything for her. All she had to do in return was help him kill of a couple people. However she knew she'd have to train him first. People don't become killers overnight. He didn't do much in the beginning. He would stand and listen to her instructions, and avoid all eye contact with the victim. After five or six, he began trying things for himself. Meg was impressed; she thought he'd bail after the first vic. She loved to watch him work; see that crazy look in his eye, that wide, dark grin spread across his face whenever he carved into someone. She couldn't deny it - it was pretty sexy. And it was from there that their partnership began. They soon became inseperable.