For a while, draining Harley for six to eight hours at a time works to keep him out of trouble. He's too exhausted by the end of it to go anywhere, and Aelise puts him under again too fast to let him.

But it's not a permanent solution.

Three months after he is installed in his little room, Aelise finishes a particularly lengthy session of draining him, and he takes a breath and shudders and disappears.