That's what a personal assistant is for, to always be there when the boss wants her to be. And to do what he demands. This man wanted to relieve the tension - the assistant was at hand, without hesitation and took advantage of her. According to her cries and sighs conclude - this is the work she likes!
I'd let my wife get fucked too. Just to make sure she's a bitch. Any chick's just waiting for that. That blonde doesn't mind being fucked all over. That dog with the rubber band ain't her husband, that's for sure. And the hubby, as the owner of the chick, fucks her without too much precaution.
Fucking in the anus at a porn casting is like an exam. If the sex is successful, the girl will have a dizzying career in the porn industry.