The summary of my feelings on this topic would be: It is a dangerous game, one with a high likelihood of ending badly.
.
And to quote a tried and true cliche, "Never mix business with pleasure" (or in this case since the business IS pleasure, reinterpret as, "Never mix business with romance")
Providers are in the business of nurturing a man's emotional and sexual needs and making him feel special. Many of them take pride in creating a sense of intimacy and connection and genuinely DO regard you as someone special BUT in the same token get creeped out and turned off if you cross the line and try to date them or become "too intimate\familiar" with them.
This is easy enough to determine by being open and blunt with her. A query like, "I really enjoy our sessions and I don't want to ruin them but I feel like there is something extra between us besides just business. Would you like to go on a real date sometime? It's ok if you say no, I might just be getting carried away. (give her an out)"
She will tell you straight out, in the nicest way possible. More likely than not, she will say gently that she doesn't date clients or some such but she thinks you are really nice (ego soothe). Then you can laugh and say you are cool with things the way they are that you were just checking (re-assure her so things don't get weird).
.
Now there is a 2% chance that she really does want to date you and has needs outside the hobby and\or is curious enough to try it out.
This is where it gets dangerous. If you already have feelings for her ("love pangs"). MANY things can happen. She could go out on a few and change her mind and things will get weird. Y'all could go out and your feelings deepen (and become painful) and what
you thought you were cool with (her hobbying), you suddely no longer are...
.
AND if things go south, you have just lost what sounds like is one of your ATF providers. Is it worth the risk?
.
It's just SO much easier to embark on a relationship outside of the hobby. IMHO, you should just keep the two worlds separate.