I think you got bargain. I mean, $40 tip for some boobs in your face and a nice HJ. Rock on! In my experience, the more you frequent place and ask for the same girl, the more comfortable she is with you. I've never been to this particular location, but you may want to go again and ask for the same girl, she'll be more comfortable with you, ask for a bj next time you see her, she may comply.