Derek
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Bitting your nails. Derek hates when you are biting your nails he just hates that. At time you don't even notice that you are biting them until Scott, Stiles, your mom, or Derek points it out. You bite your nails when are concentrating or your nervous. Like when you study you bite your nails. When your nervous like you think about what did you forget at home. Derek tries to help you stop but you just keep biting.