Aaah, the flakey model. Something we've all dealt with-- my favorite was when a very well known porn star was over an hour late to my set. I called her, and she was SLEEPING. Not only that, but she was annoyed that I woke her up. We told her agent, and he dropped her immediately. If a girl flakes on me once, I will never hire her again.
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I really try to retain a respectful distance from my models, even when I'm lubing up their pussies.