Troublemakers(A Tmnt Fanfic)

Crystal, nicknamed Cry(female version of the wolverine) and her sister Karai were always there for each other, no matter what. And when their father, the Shredder, gives them a mission that could kill Splinter and the turtles, she can't wait to complete it, having being taught that Splinter and his sons were evil and that they killed her mother long ago. But when she begins to get to know the turtles more, she thinks her father may have misjudged them. But she knows that she must complete the mission. One problem, Karai may have fallen for one of the turtles and may not want to complete the mission. Can Karai turn her sister away from the mission, or will the sisters that were always there for each other, turn away for good(Based on the 2012 tmnt series)