I'm similar to Hitachi. Sometimes I need an extra boost in the imagination dept to get over the top. When I do, I will place my lover in a fantasy that I know my lover would not approve of. What gives me the boost is not that I know he wouldn't approve of it; that just happens to be the way it is. I know I couldn't share it with him, so I just imagine it while we're making love instead. However, I don't fantasize that I am with someone else in particular.

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Communication is the key.