Target Practice [Mafia boss! Eren x Assassin! Fem! Reader] [AU]

[Y/N] is part of the most elite & accent family of assassins, the Dresnos family. Despite being so powerful, the Dresnos haven't always followed orders, therefore the family is almost extinct. The Titans, the most feared mafia group, have slowly taken care of them one by one. Now, only [Y/N] and her father, Ronan Dresnos, are left. They are hired by the Titans to eliminate Eren Jaeger, the now boss of the Scouting Legion, the most powerful mafia group. But Ronan sees this as an opportunity for the Dresnos' final act of rebellion. He send [Y/N] to protect Eren and help him eliminate the Titans once and for all.