She claimed to have a black heart which was devoid of any emotions. But she still had a heart even though it was dark.
Then you came along with your set of crayons. Tried to colour her in your favourite shade.
But since her heart was black there wasn't much that you could do. Still you were persistent and continued to colour her in a different hue.
As you scraped the crayon across her heart, you realised that some blood had started seeping through.
But you were so blinded by the joy of knowing that the inky colour could be removed that you stabbed her heart and left her body to turn blue.