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One night, Spike lets Dawn paint his nails. She insists on multiple coats of black polish, being careful not to smudge it. Afterwards, he paints hers- sky blue with pale pink polka dots, at her request. She surprises him by correctly guessing that he used to help Drusilla do her nails, too.
It's an artifact from another life, but one that's apparently still useful. He supposes it's because he's more or less doing what he's always done- armoring the poet in black coats of paint, and looking after the only person who he can still be of some use to.