I don't mind sharing, but my experience is from a while ago.
I saw Monique a long time ago and she offered a full (FULL) upgrade by dropping my hour VIP (Typically just a body-slide) to a HH and whispered into my ear, "We can do everything".
Honestly, depends on the girl and I found after visiting there a few times with a girl they'd offer expanded services, sometimes for a tip, sometimes just because they liked the cut of my jib.
Depends on the girl, rates for "off book" stuff are private, between you and the girl, YMMV, and - naturally - are just two consenting adults agreeing on doing something behind closed doors that is entirely your business.
Same deal for HFH, FWIW.
Happy hunting.