I think the turn on for me would be the complete submission involved in a non-consensual fantasy would be great. I'm usually the more-dominant person in bed, and just laying back and receiving would be a nice change of pace. (but don't tell him that-- I have an image to uphold )

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I am certain of nothing but the holiness of the heart's affections and the truth of imagination. What the imagination seizes as beauty must be truth - whether it existed before or not.
-John Keats