The girl met you through work, she decided to hire out her body, you rented, that was the deal, both had control of the situation. Prending you can then come to know that person as a non money transaction for sex, and build in the normal personal things that we enjoy in a usual personal relationship, is a delusion. We go to a WG for sex/ fantasy/ descretely to enjoy things we can't get elsewhere, that we would likely not do with the 'personal girlfreind' type relatiosnhip. She also probably doesn't tell her mates that she's a hooker, she probably preserves a normal social network of friends separate from her 'work' contacts. The chance of the one that was sex for money, converting well into the other which is freindship/ partner/ relatioship/ known to our friends and social group, without fall out sooner or ater, is very low indeed and probably dangerous territory. Don't kid yourself. Get some new hobbies, meet people that way.