As has been mentioned elsewhere, things that require better communication with the girl really only work well when you have her number or KakaoTalk or wechat.

 
My experience is almost certainly colored by the fact that I nearly always book 2 hour sessions. Keeping that in mind, I have had very good experiences with the few special requests I have done. For example, I frequently think that girls go way overboard on the makeup. So, sometimes I will book the first appointment of the day and ask them to wear no makeup at all. First appointment is sort of required for this request. It enables them to just do their skin care routine in the morning and then do makeup after I leave. If they had to take off their makeup before I showed up it would be a time consuming hassle. And I know better than to request it.  

 
I remember I asked a girl to do one of her simpler photo outfits. When I showed up she was in her little sailor outfit (if I remember correctly) and nothing underneath. She did a little twirl for me to show it off her skirt. Somehow (couldn’t have been planned, right?) that skirt chose that particular moment to drop off and fall at her feet. She then looked at me and did a near perfect Marilyn Monroe move (the one where her skirt blows up when she’s standing over a grating in the sidewalk) as she bends over to pick her skirt up and put it back on with the naughtiest little smile you’ve ever seen.

 
Yeah. That wasn’t planned at all. But I loved it.

 
A few other times I texted a girl I was seeing and let her know I wanted our next session to be slow and romantic. Since this isn’t my norm a heads up in advance is required. This kind of request is pretty easy for them. But you still have to give them a heads up in advance for best results.

 
If there are specific toys involved, such as a butt plug, it is usually better to make the request in person initially. For one, you won’t even know what toys they have and like if you don’t talk it over with them. If they agree you can then just let them know you’re looking forward to it the day before and the day of so they are sure it’s still on.  

 
So the trick is to text/KakaoTalk/wechat/whatever with the girl beforehand. She’ll let you know what she can comfortably do. She’ll also text back if/when she has questions. But make sure to text her briefly the evening and morning before to let her know you’re looking forward to it. This seems to mean a lot to them (at least in my experience) for some reason. And then your job is to let her have the space to do the performance she’s planned. It will, in my experience, always be at the beginning of the session and won’t last long.