Book One- I Don't Understand

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Sam slung her bag of belongings over her shoulder and followed Jack down the stairs to the reception room. There stood two men, fingers interlocked. One had a blue hair tone with tattoos all over his neck and arms. The other had a purple shade of hair with tattoos and a nose piercing.

Sam had a smirk appear on her face. I might like these guys, she thought. Jack gave her shoulder a small squeeze and continued walking forward. The two sat in the chairs opposite the couple with Melanie in a separate seat beside the two men. She gave Sam a 'don't fuck this up' glare. Sam rolled here eyes and crossed her arms, leaning back on the couch with one leg over the other, bouncing its foot. Jack swallowed the lump in his throat as Melanie introduced the two.
"Mr. Felix and Mark, this is Sam Winters and Jack McLoughlin. They are the two you agreed to adopt."
Felix eyed Sam and smirked. "I like the girl, babe. She looks bad ass."
Mark smiled and gave Felix's hand a small squeeze. "The green haired boy looks like one, too. His hair and toned muscles aren't too bad."
Sam smiled a devise smile. This is gonna be awesome, she thought to herself. Jack was still sitting straight, face pale. Melanie cleared her throat.
"The total cost is going to be £200.00 for the children," she said.
Sam sat up and scoffed. "Who the fuck told me that we were being fuckin' sold? Melanie, why didn't you tell me you piece of shite! I am NOT being sold. You better give me a god damned reason for this shite or I'll flip this fucking coffee table."
Jack gulped. Melanie was horrified. Felix and Mark smirked and looked at each other, then nodded. Felix leaned into Mark's ear and whispered something, making Mark's facial expression change to serious. Before Sam could potty-mouth their little whisper, Felix pulled out a gun from a holster tucked under his shirt and pointed it at Melanie.
Mark stood up and strutted quickly over to Jack, grabbing his shirt collar. "LEAVE HIM THE FUCK ALONE," Sam yelled, slugging Mark in the gut. He slouched, gripping at his stomach. Felix fired a shot in the air, making the attention turn to him. "JACK, GRAB SAM AND YOUR SHIT. GET TO THE NISAN OUTSIDE. NOW," Felix screamed, face red. Jack shakily grabbed Sam and his bag, running out the door and to the parking lot. Felix was carrying Mark, who was out cold, to the car, firing shots behind him as they ran. He unlocked the car and set Mark into the passenger seat.
Sam and Jack climbed into the back seats whilst Felix practically jumped into the driver seat, starting the engine and pressing the gas pedal, speeding out the parking lot.