Larksong Grotto All I Need is Green

Charley, laughing, turned his face from her smacks and silvery pelt, but his eyes darkened at mention of his sister. Emory? She'd abandoned him, as far as he knew. Up and left after the locusts. 
             "Don't know. She ran off somewhere around the locust storm and never came back."
His laughter stopped, and he put his head down on his paws as Aspen, thankfully, turned the attention away from him. Why had his twin left him here, alone? They'd never in their lives been separated more than a few hours, but it'd been so long now. Was she coming back? Had she found a mate, or something?