This is a double edged request. On one side my fantasy roleplay is for a provider to demanded of me, to do multiple pops while she rides, pumps, jerks etc. On the other side the fantasy requires a provider who plays on all three fields, four if you count the hand. The question goes out to hobbyists, do you know of any providers who does this, and what were your experiences. For providers, do your services/skills match this request. Any feedback is helpful.

Reading reviews of girls who interest you.

Then contact them, give references, and meet them.  

Be respectful and cooperative during the entire screening process and in-person.  That's how you build references.  If you want something VERY specific, request it on your second date.

Most girls don't want to talk about any service that may or may not happen if they have never met you before