A Form Far From Foul (фемслэш)

For almost as long as she can remember, Anna Nomic has been plagued with a strange rash on her back, forcing her to take strange treatments and stunting her social life. On the cusp of adulthood, Anna decides she can take no more of her sister’s unexplained demands. Only she can’t quite bring herself to leave until she finds a way into her sister’s room, discovering the extraordinary truth behind her condition that she can't quite remember, and what Elsa is hiding from her.