The free play mode from what I've seen is a good first step, yet its implementation needs some improvement. Yes, the game plays itself freeing up your hands, but the game plays its self so efficiently that the sequence is done before you as the viewer can do anything. Also there is no option to pick your favorite girl. Your stuck having to run through the specific bracket of girls in order to see a favored girl in action.
My suggestion for a tweaked free play mode would be as follows: Free play mode has a display menu showing every girl on screen as a "face button" to allow for individual selection and viewing of a specific girl. Once a specific girl is selected, the viewer is taken to the girls milking section. The gameplay aspect is removed and we just have the animation sequence of the girl inserting, copulating, ejaculating, pulling out and then repeating the process infinitely. There would be a "pause button" to start and stop the animation sequence, a "view button" which allows the viewer to change the view point between the normal view, in front of the girl and in back of the girl, a "speed button" though this will depend on factors; If the speed/intensity of the girls is assigned randomly each time the girl appears in the milking section then the "speed button" controls the the speed/intensity as she milks, but if the girl is assigned a speed that doesn't change each time she is used then there would be no need for a "speed button", and a "back button" to take the viewer back to the display menu of the free play mode. The runtime of the animations for each girl from "inserting" to "pulling out" could be somewhere around 45 seconds to 1 minute per loop.
Finally, I did notice an issue where the menu stays locked in place if I try to make changes to the setting while I'm in a milking session. I would hit resume and the menu would not disappear. I would have to exit to the main menu and start over to get the menu to disappear.