Sirius whipped along the road for a few blocks, just for fun, and then began the climb up into the sky. He kicked in the muffling charms as they rose, cutting the noise down to a vague rumble that would be hard to hone in on, and activating the disillusionment charms as they passed over the Leaky and approached the distinctly Muggle glitz of Piccadilly Circus. He climbed higher, letting the shifting lights of the city spread out below them as he headed southwest, their path now and then crossing the dark, curving ribbon of the Thames.