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[She's not sure the welcome info delves that far into, but she's heard talk and read a great deal more since she arrived here. She likes having his attention focused on her. It's a novelty, something new. The other Doctor paid attention to her, of course, and sometimes she even had his entire and total attention, but it was never quite so focused as this, never quite so pointed.
And the whole idea of shampoo draws her attention to his hair. It's fairly well known (and by Donna) that she really loves his hair. She tucks her lips between her teeth, the tip of her tongue slipping out to wet her lips.]
Th-that one. [She reaches out to grab a bottle without looking.]