Fight Together Tall! Levi X Tall! Fem! Supernatural! Reader

Y/N is the daughter of Captain M/N L/N and Lieutenant F/N Night and dreams of fighting alongside them when she's older. One day, 15 year old Y/N finds out that she's able to create something no other human is capable of. When her parents find out, her father shows her that he's capable of the same thing and promises to give her an explanation when he and her mother return from their expedition. After a month, Y/N is forced to hide in the Underground City where she winds up living with a rather antisocial boy named Levi. As the years go by, Y/N and Levi are forced apart after living together for almost 10 years. After reuniting after 12 years apart, a series of mind-bending, unbelievable events begin to unfold.