I would do as advised above;
Get the hell out of there. she's giving you free sex, and there's no manipulative reason that won't sooner or later get you in deep water ?? Yeah right....
Some people are very manipulative and will string you along until she has enough about you that she can use. You didn't go there looking for a girlfriend and I would be highly suspicious of what she's up to. Hookers are in sales and are often good at making you feel ok about handing over your cash, its their job, however much she's buttering you up, and in this case the way you will be expected to pay, sooner or later, will probably be very uncomfortable indeed.
Advice - WALK... quickly before its too late
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Agree with : "The game is about 'anonymity' and no strings (for me at least). If I wanted the complexity and fucking headache that this will inevitably bring - i'd get married and then fall in love with/fuck someone from work."
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Having now read more of the thread I see she's gone anyway...... but my view remains in any similar circumstances.
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On Wills and all that - Never forget that however strong and obvious a claimant's case seems to be, the courts are capable of the most bizarre and extraordinary decisions. Some people might even say that lawyers are like some Hookers, they invite you in with assurances to do/ achieve such and take your money on that basis. The skill is doing enough to satisfy each bill/ payment, always leaving the temptation that a bit more can be provided/ achieved if you would like to cross their palm with more silver.... That's a bit of a generalisation of both professions - I did say 'some people might say'.