You by Caroline Kepnes
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Summary
You walk into the bookstore and you keep your hand on the door to make sure it doesn't slam. You smile, embarrassed to be a nice girl, and your nails are bare and your V-neck sweater is beige and it's impossible to know if you're wearing a bra but I don't think that you are. You're so clean that you're dirty and you murmur your first word to me, hello.