I stayed in HK for 6 months and I think you can easily find a SYT or OL if you go to pubs or clubs there. Just buy some beer, waiting for eyes contact, buy her beer, a little chit chat then shall we go
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Of course you can try bonking gals from 141 and 161 but they are PRCs after all and you can find some GEMs better in GL with more reasonable price.
Please note that HK$700 is S$120.