Rented hands and a signature that isn't mine

I'm sitting at my desk and my hand is writing my name — only it's not my hand anymore, it's someone's that I've been renting, and the brush is doing all the work while I just watch. Every stroke lands perfectly, better than mine ever did, and that's the worst part. I keep trying to pull the brush away but the hand won't let go, and the signature at the bottom is legible, elegant, and completely unrecognizable.