Its a valid question as most FBSM providers tend to allow things progress from HE to FS as you build rapport.
I've booked several FBSM SP's that went from just clothed HE then to FS - somethings they got hunny and offered FS to my surprise!
At the same time some FBSM SP's will do B2B + HE but wouldn't cross that boundary and its best not to push it as they may feel unsafe taking additional booking from you.
In all if you enjoy the SP's Massage technique then continue booking the SP, then hopefully things will progress beyond the normal service offered.
My response is based on multiple bookings with SP's over the years and some tend to loosen up in the end, if its a registered premises then they will expect a hotel or home visit for the FS - most for fear of losing their license.
In all, patience is an important virtue in FBSM as a hubby - it that can bring many extras. It involves being able to enjoy your sessions with an SP without becoming frustrated or giving up, if you go only with the intention of whats on offer & any extras just adds to the build up.
Also don't forget the SP is human too, developing strong relationships often requires patience & you can develop a deeper connection with them that can lead to more extras. It takes time to build trust and establish mutual feelings.
If your not patient then read the review (s) or PM punters for SP's that offer both, as some of them take longer to loosen up.
Happy plunging