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I'm staying with my brother and his wife. My brother is in his prime and he's often away on business, so my wife always seems lonely. I was often alone with her, so it was awkward at first, but I gradually started to like her because she treated me so kindly. I thought I wouldn't do anything because she was my brother's wife, but one day I witnessed her masturbating. Then my brother's wife got out of control and got on top of me and grinded like a rape! I didn't want to lose, so I gave her a hard pounding! I never thought I'd sleep with my brother's wife...