[from here]

The last hall turned into the next, and Albedo paused then, froze like a deer in the woods. Close, close, but not close enough. The beat his own heart echoed. His eyes widened to take in any light he could see, pupils dilating as he muffled his waveform, thrusting it down. Though with his heartbeat echoing.... Albedo watched Rubedo, but the other didn't seem to notice his presence. He didn't know whether to be pleased or petulant.

His twin seemed no worse for the wear, nothing unmanageable, nothing too out of place. Both hands still as they were, Albedo ran his tongue over his teeth. The duel instincts were pulling at him, one gradually growing stronger than the other. He restrained the urge to run to Rubedo, fasten on to him like an accessory, and whispered promises to the other, that wanted pain and attacking and vengeance. There was still another brother to check on, and then, and only then, would Albedo make up his mind. Slinking behind Rubedo, and carefully staying to the shadows, Albedo followed him.

There was a good thing in having some unsavory habits.