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Is it wrong?

Oh some shocking news for my quiet fans, i am a masochist. Basically what that means I love being in pain, I get me "jollies" that way.Anyways, is it wrong to frustrate me girlfriend's ex boyfriend, because she wants me to have sex with him. At the same time , having my fun and getting him mad enough to act out on me? :) I want your guys' opinion. Also i am feeling a little how should i say dark lately. So tread lightly. hmhm.
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So my little loveable readers tell me something if a person you know is in a open relationship woulkd that frustrate you?