It's still magic even if you know how it's done

I'm Rosie, I'm fourteen. I'm a Whovian, Potterhead, Merlinian, Sherlockian and Supernaturalist in training. I am part of the Nermie army, The Moffia, Team Coollike and I am a proud Nerdfighter. Sometimes I make gifs. Dean Winchester is my spirit animal and I’m a Slytherclaw. Have fun, sweetie. Unable to post due to daily post limit ()

The answer’s 42.