Ghost Girl

"I remember you, your the girl that saved me."

Celosia Black, the forgotten girl.
Have you ever thought of ther life of a lone Slytherin? Of course not she's just a sly Slytherin.
you'd never give her a second glance especially since the Golden trio is in Hogwarts. But what happens when in year 3 Sirius Black comes back and hears her muttering about jumping off the astrology tower.