I agree with cherrypie on this one. But you did show her that she can't sneak around and you did it with class. You should have told her that if she behaves herself you might let her have a 3 some with the two of you.
Don't ever show your insecurites hun. It's a sign of weakness and a big turnoff for men.

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I am here for only a short time on this earth. My goal is to make everyone I see smile if only for a moment.