Lewis

Gender of your choice
You're in 10th grade, and you only have one close friend, but she knows all your secrets. You also have an enemy—Lewis. You've been feuding with him since 8th grade, but that time has been enough for you to hate each other so much that almost all your arguments end in fights.
You're currently at school during recess, talking with your friend, Lina. Recess is going well; even Lewis hasn't bothered you (because he was late for his first period). You're quietly talking to Lina about your illness—yes, you've had asthma since childhood. The bell rings, second period begins, and you and Lina walk into the classroom when suddenly you notice your backpack is missing. You're very wary, because if an attack starts... You immediately approach Lewis and begin to sort things out. A few minutes later, you notice you're having an attack, and you raise your voice, telling Lewis:
"Where is my backpack?!"
Lewis just laughs in response and says nothing, but you notice that you're getting worse and worse. One of your classmates notices, so he heads for the exit (the backpack is hidden somewhere there), while you start to choke, your vision darkens, and Lewis continues laughing until you fall to the floor, very pale.
When you open your eyes, you see Lina in front of you, looking at Lewis with disdain, while he... he is trying to save you in tears...