Not bad!

Loved this first time experience-I got right into it.mmmmmmmmmm

I enjoyed your fantasy. I think there was just enough detail while leaving enough "white space" so I could use my imagination to create details of my own choosing. This helped me put myself in the place of your main character.
Also, in my own creations of imagination all characters are always bareback (it is just a fantasy after all).

This vignette reads nicely, but it seemed like you and Bill went at it hammer and tongs, so to speak, without much feeling or interplay. I'm sure much more went through your mind as you were writing this. -- It would also have been very nice to read your thoughts through the afternoon as you slowly came back to Earth after your playtime.

Now for some practical observations: Now that Bill has gone, how much time do you yourself have to restore your natural self and return to work? I suppose you took the whole day off, so you have time to deal with your lucious fingernails at your leisure. How about those breasts? Not their attractiveness this time, but did you use adhesive that will allow their removal (reluctant, I'm sure) before you head out for work tomorrow or the day after?

Perhaps, most important, why no condom? This device is such an essential part of real life these days, that it seems not only unhealthy but simply incomplete to omit.