Dean.
Of course she's using us! I know that! God, Dean, do you think I'm a moron? She wants to kill Lilith. It's what she's wanted from the start. When she found me after you died, that was practically the first thing that came out of her mouth. "You can't bring Dean back, but you can get your revenge." That was pretty much what she said to me. I knew that it wasn't out of the goodness of her heart that she was opening that door for me, but it got opened all the same. It wasn't until later that she started changing. She started to listen to me and - fuck, I wish you could see.
Right, because you were gonna be so accepting of me using my abilities. Look at you, Dean. Every time I so much as exorcise a demon without uttering a word of Latin, you freak out. You might not vocalize your feelings, but the look that I see on your face speaks out a thousand words that you won't ever have to say. I know what you think of me. I know what's going through your head. I'm not the idiot here either. Maybe I'd have avoided lying to you if you didn't act like such a prick about me being different! Maybe I'd trust you more if you showed a little faith in me.
You'll never approve. I know that you won't. But you need to accept the fact that this is happening. I trust Ruby. I'm going to be around her. If you can't deal, I don't know how we're gonna be able to work together. I don't know how we're going to be able to stop Lilith in time.