Lucy Heartfilia, a rookie for the FTSA, becomes partnered with the top-dog and badass spy, Natsu Dragneel. While dealing with a group of terrorists, both operatives begin to feel different. Will he forever be the coldhearted, ruthless playboy? Or will Lucy be able to change his ways? (I DO NOT OWN FAIRY TAIL) (nalu, rolu, other minor pairings)