I have been with my gf for five years, we are both 19 and have a two year old daughter. I love my gf to bits but for the past few months I have been really attracted to her younger sister and I cant stop thinking about her, she comes round our house and sometimes I just cant help staring at her and everything she says just seems to wow me. She is 17 and looks exactly like my gf. They are both really attractive girls. I want it to stop, I am really happy with my gf but I just cant get her out of my head. She sometimes stays round with her bf and sometimes I just get the feeling I really want to smack him and it makes me angry inside that he is touching her. What is wrong with me?? It is driving me mad. I thought maybe it was just a brotherly kind of thing as I have known her since she was 12 but I cant kid myself anymore, I think about her in a sexual way.
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