Volunteer to look after River

Simon is very worried about his sister who is, as you've figured out by now, far from a "normal" girl. Before he can talk to Inara or anyone else, you volunteer to keep your eyes on her, and Simon seems to trust you enough to leave the girl in your hands. He thanks you and then is off with the others.

You immediately go to River's room, finding her sleeping on her bed, fully clothed in a red dress and leather boots. She has an oddly peaceful look on her face, her mouth slightly open, her eyes fluttering the slightest bit, her hair in orderless strands over her face... she's a real beauty.