I should have known I was in trouble when I backed my old, beat-up truck into the shiny Range Rover. The driver looked like a gorgeous fallen angel–one who’d been booted right out of paradise for being a giant prick. Good thing I’ll never have to see him again.

I don't know when it happened. I didn't think it'd ever happen. I can't lose her. I can't even imagine losing her. Rule number six: This is supposed to be fun. Understand? He's my bad boy and I'm his good girl. And, yes, he's my stepbrother and I'm his stepsister.

How can something so wrong be so perfect at the same time? Rule number five - I'm going to show you some things that you'll never forget. It's wrong. Not just this, but everything. I knew it was wrong, but I thought I could get away with it. Why, though? I'm not like this. I'm good. I'm the good girl, the girl with perfect grades, the girl who does everything right, prim and proper. I don't cause trouble, I don't get into trouble, I don't....

I was never supposed to fall in love with my stepbrother. I never intended to. It just sort of happened. Rule number four - You can change your mind, too, Ethan. We can't. We're done. This girl lives in the same house as me. Her bedroom is just down the hall. It barely takes 20 seconds to go from her room to mine, and yet it's an impossible distance now. She might as well be on the sun.

I thought I was a good girl, but then why do I love hearing all of the naughty things he says he wants to do to me? Rule number three: You can change your mind, Ashley. Not just now. Whenever. I could tell Ethan that the only thing I'll regret about this is that we only have a week together. Except I can never tell him that. I need to stop. I need to understand that this is a temporary situation, and that I'll never have it ever again, because no matter what, it won't work out, whether I want it to or not.