Skip, it's hard for me to explain exactly what I'm imagining, but it isn't that I am trying to imagine so much how my body must feel to him, such as the wetness, smoothness, or tightness of my vagina when he is inside of me, but more that I imagine how HIS body must be feeling. I imagine that I am inside HIS body and I can feel how aroused he is...how his lips and tongue must feel when he sucks my nipples or how his dick must feel to him as he is about to enter my pussy or my ass. I know, for example, that the biggest turn-on to him is fucking my ass. He said recently that there is no other feeling like it, that it isn't just the way it makes his dick feel but, he said, it's like "possession is taking place" (a big turn-on to us both since I'm a bottom and he's a top). When I imagine how he must feel emotionally and physically at that moment, I feel the blood rushing to my pussy, my clit gets hard, and it sets off firecracker orgasms.

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Communication is the key.