Cancer Perks ( a Niall Horan Fanfiction )

Katie Henderson was a big fan of One Direction. Though she thought fan girls, the ones that will faint over someone, were dumb.
When Katie's younger sister dies from cancer, she uses her wish to let Katie spend a week with One Direction.
Will one week be the only time she ever sees One Direction? Or will a certain Irish band member fall for her? Also, will Katie be able to accept the fact that he likes her, or will she believe she is just a cancer perk?