"Why do you do it? Why do you fly off in the box with him?"
Danny hadn't been the first to ask her that question, just as he hadn't been the last.
But how could the Danny Pinks of this world understand the thrill of the adventure, the magic of the universe, the butterflies to her stomach when the Doctor held her hand just before the running. The absolute trust and the being desperately needed.
How could she possibly convey all the things she, herself, struggled to understand? She didn't even try and always smiled, shrugged, said "It's complicated" instead.