Demonic Fashion ( working very slowly on)

This story is about a high school girl who gets hired to be a personal clothing designer by a very rich and well known family for her unique talent for designing and making clothes. She now lives with them in order to do her work along with the maids and butlers they have. She meets one of the mysterious family members and seems to have a connection with him. And he isn't who he is told to be. But she isn't who everyone thinks she is either. But what's a story with out secrets right?

Who is this mystery man ?

what is the family really?

What does it have to do with the girl?

What her secret?

Read to find out !! :) and sorry but I stuck at the description part. :/