As a couple who monger on a yearly basis in LOS. Trust us when we say you don't need to advertise on here for what you are looking for. As said above travel down Bangla Road, find a bar that you feel comfortable in and buy the Mamasam (sorry about spelling) a drink or two and tell her what you are looking for.
If she can't help then simply go to the next bar and I bet that in less than an hour or two you will fnd exactly what you think you are looking for.
Unfortunately it will be a learning expereince because like so many BMs on here expereince - The BGs can string (only some) you along if you aren't clear about what you want. But it's all an enjoyable learning experience.