Ewon

Hi friends, I am looking for a yaoi manga about two half(I think)brothers...the entire servants of the house think that the younger brother hates and physically and verbaly abuses the older brother but the truth is that the older brother forces him to do that, they have a s&m relationship were the older brother I think cuts the younger with a piece of glass....in the past their father was sexually abusing the older and that's why he hates his younger brother....that's all I remember...thanks in advance!!!!