It's always best to ask the owner of the agency.  He/she should be able to tell you exactly what the girls will do.  If he/she can't answer that, then it's probably best to find a different agency.

A while ago a man booked a date with an escort.  With her permission he tied her up.  Then without her permission he did a creampie and left without paying.  

(My understating is chica--with the agency's backing--filed raped charges.  If the bastard returns to TJ I hope the cops catch him.)

Since then some agencies and escorts have less interested than they once were in helping  clients find submissive sexoservadoras.  If you are a long term clientwho has a good reputation and raport with an agency they may help you book the date you want.  The same applies to chicas whose confidence you have earned.  But don't be surprised if nobody is interested in helping