Similar kind of thing happened to me in my early days of punting in HK
I once visited a little hottie walk-up girl in CWB. Price that was quoted was HK$500 and I accepted. Our physical session ended a little after 30 minutes in and then we were lying on the bed and talking before taking a shower and then talking a little more. As I was leaving I took out my money to pay including a $100 tip, her personality totally changed and she said it was HK$1,000 because I had spent an hour
First time that this had happened to me and really soured what was a top session. I challenged her a little and told her than she never mentioned there was a time limit but I ended up conceding and, upon reflection, it was probably not unreasonable although she should have been clearer on the pricing given I had only had one pop and had I known the time limit I would have been out of there straight after
. I even called her bluff and said I usually get 2 pops for HK$1,000 with walk-up girls and she reluctantly offered another round but I decided against it and just paid her as if I spent another 30 mins there she may have upped the price to HK$1,500 which was definitely not worth it.
In any case, the lesson I learnt was to be clear on pricing and now I try and avoid small talk with first-timers