It's basically a FWB where you spend at times longer times to chill and hangout if that's what you want. They all have their own price ranges which you'd have to ask. Some don't want as much compared to others. I'd say a SB is very similar to an escort than just a SP. But you can treat a SB similar to a SP if all you really want is to get down to business and leave than do extra things. You'd also have to discuss with her what's she's into. Some strictly just want friendship and nothing more.