"Code names?" she repeated back to him. "Well, you already know the one I have for you." She had inadvertently revealed it to him when they first met, back when she didn't recognize his face. Damsel in Distress still seemed fitting for this situation. "Do they need some kind of theme?"
River pondered the Doctor's question. "You once called me the 'child of the TARDIS.' Maybe she feels the same way?" She paused briefly, thinking back to her first encounter with the TARDIS almost two hundred years earlier. "On that day... She got inside my head then. I remember my hands moving over the controls without actually telling them to. And then suddenly it was all there, in my mind, as if I had always known how to pilot her. It was a strange sensation. I don't know, perhaps she liked what she saw in there." She raised her hand to her hair and ruffled her curls. "Time Head," she said with a shrug.
Ice cream? All right then. River rolled her eyes and smiled in defeat. "What flavor?"