Is reading a hot story like yours. I get all hard and excited and just have to pull it out and stroke it. As I read more and more of the story I get more excited and closer to cumming. I grab a pair of used panties from my g/f and wrap them around my cock and start to jerk off even more. The smell of her pussy and the story put me over the edge and I cum in her panties.

How's that. Not quite as detailed as yours, but just as enjoyable to me though.