Yep! My guess is she's a hooker a few years in the game. She's been fucked by 1000's of sex tourists and all of them go ape over her big tits so all this is all a big yawn for her. She's hooked this guy, got the money up front and now just wants to finish him quick and hook the next John. Instead this guy is making happy talk, wants her to play with her tits yet again and he keeps fussing with camera angles. So she's bored and annoyed. The only time she smiles is at the end, probably telling him what an amazing fuck he was so he'll give her a big tip