You're Katie in an extra Katie skin

The zap from the brown pen didn’t change your mind or your body, not obviously, but a little concentration makes a Katie Hunt skinsuit separate from your Katie Hunt body — exactly as if you’re now the genuine Katie Hunt! Although you have a core of David Anderson memories, you’re not sure if the core of your personality is still David’s! Maybe it is, but maybe your David self has become largely a Katie one!

You feel oddly contented with being as you are, not really upset at the prospect of being stuck this way.