Darkness in the Heart

"Her eyes were both golden and they sparkled brilliantly. Jack felt two emotions enter him suddenly. Envy at first, she had both eyes golden, while Jack was stuck with one blue eye. However his next emotion startled him, he thought she was pretty, and he liked how she looked. Her very presence made him smile. And that made Jack feel warm for the first time in his life. "

What Jack Frost never expected was to have Rapunzel waltz into his life. When Pitch brings Rapunzel home with him as his daughter (to be Jack's new dark sister), he never expected how close the two would become. After years they become very valuable assets and help Pitch take down his enemies. At first they are the perfect fearlings, sadistic and dark like their father. But as time passes they start to remember their past, and suddenly the darkness in their hearts start to vanish as they spend more time together. What happens when the two fall in love and challenge the darkness in their hearts