"Derek stares at him. It’s not an angry shove-your-face-into-the-steering-wheel face, and it’s not a menacing turn-the-car-on-or-I’ll-rip-your-throat-out face. It’s a face that Scott gives him sometimes, when it’s late and they’ve just done something crazy stupid and he nudges Stiles in the arm and tells him that they’ll be best fucking friends forever. It’s a face that says everything from ‘this is going to get so fucked up’ to ‘I trust you.’ Derek lets out a breath, and this one is shaky, and shivers run down Stiles’ spine, because a shaky Derek is always cause for concern, and it means that something he doesn’t know and probably won’t like at all is going to happen, and that scares him."