"Mn," Lan Wangji says, just to acknowledge that Magnus has spoken but without altering his course of action whatsoever. It is not a requirement that Magnus be overwhelmingly distraught before Lan Wangji offers him comfort. And in any case, it was so unsettling to spend time with an incarnation of Magnus who seemed mildly interested in him at best, certainly unlikely ever to turn to him for anything. He relishes that feeling of Magnus burrowing into him. He holds onto it, and him.