The problem was, Tonks didn't feel safe apparating straight from her and Remus' hideout to Charlie's flat. In the end, she'd actually turned into a bird to get a good distance away from the house, then apparated several times before finally arriving just outside Charlie's door. By that point, she was no longer a bird, but she didn't really look like herself either. Her hair was long and blond and curly, her eyes blue, her face thinner and paler, her body having less curves. She looked, in short, like a complete stranger when she raised her hand and knocked on Charlie's door. "Wotch- Hello, Charlie. It's me."