Hi Mickeyp,
There are many ways that you can achieve your FMF fantasy in BKK. Most escort agencies will send two suitable girls to you hotel, so will the many massage shops, you can find many on line if you do a search in google.
Bars and Agogo’s are another option possibly not as easy two find two girls separately, if you choose one she will have a friend, you may well end up having to pay two bar fines.
Could also try the Eden Club in Nana, the place is legendary, again go online and google Eden club Bangkok it’s all there.
Other may have some other ideas, enjoy your time, it’s a fun city.