Bro, frankv1234. Welcome.
Please take the time to read the reports contained in this Forum. There are recent threads discussing exactly the merits of using Agents for In-Call services. Better yet, provide some of your own reports from your part of the World and
join this Community.
Making your first and only post a request for information (that is easily found with a modicum of effort) to be served to you does not make a good first impression.
Above said, I will give you my opinion that: a) finding skinny girls with small breasts (relatively speaking to the rest of the world) in HK is not a problem, but b) using Agents for In-Call services is NOT recommended by most experienced Bros in HK. It is often very over-priced, and you will more likely than not be very under-serviced.