Talk about what you like!

IMO, good sex involves good communication in or out of the bed - I think it's great to talk about what you like with your partners, provider or not, and things you'd like to try. It's okay to say you feel weird talking about it, and you don't have to put it out there like "I read other guys get to do XYZ, can I?" (in fact, don't say it like that) Just tell her how much you're enjoying your relationship and you want to tell her some stuff you're into since you feel so comfortable now. I bet it will work out great.

If so, mention it that way and include your desire for some of the same. If she's not aware of her reviews and you think that she can handle it, make her aware of them and how they may increase her market of established clients. Then get into what you're interested in experiencing with her.  

Each provider has her limits with each client. It is always YMMV. My officemate offers various levels of happy depending on her relationship and connection with each visitor. She has told me that there are some guys that have seen her a lot and never get much more than a draped massage despite others having different experiences with fewer visits. I just straight up ask and respect the answer. Some will ask if that will mean I'm not coming back and I tell them straight up, "I won't be back". It is not a mystery why many visit a provider, so it should not be a shock why we would not return.

DO NOT be Mr. Grabbyhands or Mr. Whinypants if you don't get what you want. That is the surest way to have the menu get real short, real fast.  

Respect how she wants to run her business. If you want something she is not offering you, move onto someone that will. Providers are bombarded with requests for more all day, so you won't hurt her feelings. When you have that connection and think there is more to be had, remember this: You're special to her.....just like everyone else.