I blame this
Rose sees her Doctor in the mirror, shuffling from foot to foot in the doorway, looking slightly nervous. She can’t help the rush of affection for the ridiculous man here with her.
He steps towards her and she raises an eyebrow, noticing that he’s got one are behind his back and a faint blush creeping slowly up his cheeks. When she can feel him, his breath on the back of her neck, she turns, smiling and dropping a gentle kiss on his cheek.
He pulls his arm out and she gasps as he blushes, whispering, “A rose for my Rose.”