A/N: A certain RiverAmeliaSong asked how the Doctor lost his memory. Well, this is sort of how I saw it when I was writing Chapter 1.

— Sweetie, you can't! That thing will take every single speck of your regeneration energy!

— That's why I'm the only one who can do it.

— I can.

— Not enough, dear, — He's so solemn now. No longer trying to turn the whole thing into a joke. He knows she won't believe him anyway.

— It will kill you, Doctor, and don't pretend you don't know that.

— If I don't do it, this entire place will blow up, and I'll get killed along with you. If I do do it, I still get killed, but you make it. No use arguing, Professor Song.

— But..., — She must stop him. Somehow.

— I had a friend once. Green, pointy ears, really strange guy. But really clever. He always said that the needs of the many outweigh the needs of the few. Of course, there was another green, pointy-eared guy who kept saying that the force was with me. No idea what he meant. That reminds me. There's something I've got to tell you, Professor.

He whispers in her ear. One single word. She staggers slightly when she understands what she just heard.

— See you around, River Song, — He smiles at her, that beautiful smile. She can't bear to think she won't see it ever again. She doesn't answer. She simply draws him closer and kisses him one last time.

— Well...that was a nice goodbye present..., — he walks into the little booth and looks at her for one last second. Then he mumbles "Geronimo! ", closes the glass door and activates one of the switches. She doesn't have time to shut her eyes. Or close her ears, for that matter.

Are Time Lords always this heavy, River wonders as she drags him across the console room towards the medbay. She still can't believe he's alive, not after all the screaming she heard and the convulsions she saw. But there it is, the faint thrumming in his wrist.

— Just a little longer, sweetie, just for me, — she repeats as she heaves him onto the bed, then sighs as she looks at the display. He's alive, yes, but there's nothing she can do to help him. So she fetches a book and sits by his side, waiting for her Doctor to wake up.

He doesn't. Minutes turn into hours, hours turn into days, but he's still. River tries everything. It's only now she remembers that there's something she hasn't tried yet. — Love you, sweetie, — she whispers to him. Nothing happens at first. Then he opens his eyes and looks at her. But they aren't his anymore. The same green-grey rimmed with hazel, but none of the genius, the madness, the pain, the very-special-something only the Doctor has, only confusion as he asks : "Who are you?" And that's when River's world comes crashing.