What Will Friend Tell you If you Love his Sister??

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Suppose you are loving a girl sincerely land you don't know the she is the sister of your friend.You have told your friend about your love and he promised you that he will help in your love by not knowing that the girl you are loving is his sister.One day you show your friend her sister as the girl you are loving. What Will your friend do?? What will be his reaction at that time??