He takes their fridge apart. He prods at the little bits of metal for a week, glasses on and tongue peeking out. When he puts it back together, it makes orange-colored ice by default and the milk vanishes if you put it in the third shelf on the right on a Monday.

I lack the reviewing skills to express how awesome that was. Also loved: the Doctor meeting a few of himself, Martha worrying about the erosion of her identity, your description of the Doctor thinking of Susan (plus, any mention of Susan = instant elliptical brownie points), the Doctor taking her name, the Doc's slightly weird initial eroticizing of Martha as stand-in for the TARDIS (for you cannot fight the Doctard), and the fact that Martha's romantic feelings =/= a craving to have the Doc as conventional magic boyfriend and devastation when the semblance ends. Also, this:

There’s something both comforting and horrifying at the thought of it, and it chills Martha a bit to realize her own parents once behaved like this around each other, years before it all went to hell.

which was perfect.