Living Nightmares (Avengers Fanfiction)

Alya, Clint Barton's much younger sister, was diagnosed with an incurable disease, which was expected to eliminate her by age ten. When her condition grew steadily worse prior to that time, she volunteered for a nearly untested procedure designed by S.H.I.E.L.D. that had the potential to save her. The result was more than she or her brother ever could have expected or dreamed of, even in nightmares.

Disclaimer: If you have not seen the avengers marvel movies, some of the story may not make sense. Watch them! Also, all rights go to Marvel for all characters, except Alya and some of the plot.