Hello!..sorry for waiting..Anyway, here is the poster I made for you..I hope this fits your story..

POSTER

Personal and Story Info
Q. Author
R. JesSickal

Q. Story title
R. I'm Your Master

Q. Story link
R. I haven't done the story because I want a poster first.

Q. Characters
R. Jung Jessica (SNSD)
Kwon Jiyoung (Big Bang)
Choi Seung Hyun (Big Bang)
Lee Seung Hyun (Big Bang)
Kang Dae Sung (Big Bang)
Dong Young Bae (Big Bang)

Q. Picture links
R. Sorry , I can't provide you the picture, but I hope you can find their y pic..

Q. Mood of the story
R. Angst

Q. Story Summary
R. Jessica has five step brothers that love her so much...
But loving her does not mean five of them are sweet and caring brother...
Instead , they all like to abused and tortured they maid , they also a maniac..
Meanwhile , Jessica is such a caring and sweet toward their maids , she can't afford to see her brother always torture and make their maid a toys for them..
How is she going to deal with the situation??
What if the five of them have feeling toward their step sister..?

Q. Extra
R. I hope you can give the poster an y and scary aura...
*Don't put their name on the poster..

THANKS FOR REQUESTING!..About the title, I can't think of other title so i just stick to what you wrote..