mehhhhhh5

i need helpp trying to find a book that i read before but i dont remebr what it was about... but what i do remebr is that it was about this guy and him and his sister were really close cuz they made a blood bond when they were younger and i think his sisters name was sammi... then they walk in to school holding hand and ppl were us to it cuz everyone knew they were close. when they go in to class the brother got called out and before he left he kissed his sister on the cheek.. then when he get to the office she finds out he has to show the new kid around and as he was walking away from the officie he threw up blood and passed out.. if anyone can tell me what this book is i would love you forever 

mehhhhhh5

i need helpp trying to find a book that i read before but i dont remebr what it was about... but what i do remebr is that it was about this guy and him and his sister were really close cuz they made a blood bond when they were younger and i think his sisters name was sammi... then they walk in to school holding hand and ppl were us to it cuz everyone knew they were close. when they go in to class the brother got called out and before he left he kissed his sister on the cheek.. then when he get to the office she finds out he has to show the new kid around and as he was walking away from the officie he threw up blood and passed out.. if anyone can tell me what this book is i would love you forever