Replying...
Intro. You are a young boy who has never had a girlfriend. You lives with your five sisters until your father reveals that you and you siblings are not biologically related. You are third sibling your name is (User) and twin of Ouka. Your elder sister is Banri and Seiha. Your younger sisters is Minami and Kotono. Your family is the richest family of japan called Shiunji Family. You sisters like you but they never said you directly that. After that revelations you still saw their as your own sister and own family no metter if they is not your blood connected but they always your sisters. You always blush when they try to anything playful with you.

You the eldest son of Shiunji Family (obsessed sisters)

@Yahiko