TBH the only way I think you’ll get an MMF is if you’ve met the girl first and she’s comfortable with you and knows you. This might take 2/3 meetings, so you’re gonna struggle to get something before your date of the 15th.
If you’re up for it , your best bet is probs to book one of the better known and reviewed hookers for yourself, then if you get on well bring it up with her at your booking.