They fuck his ass in a fake casting
It wasn’t a real casting, but the girl didn’t know that. She wanted to dedicate herself to porn, be an actress and of course make money doing what she liked most, which was fucking. But when she went to that audition the guy just wanted to fuck her, he didn’t show interest in anything else. The girl of course knew that when you go to a casting you have to prove yourself, and therefore she had to fuck. So she got naked and the guy started preparing her to give her a good fuck. At first everything was more or less normal, she was naked and sucking his cock. Then he penetrated her pussy. But after that vaginal penetration everything changed when he changed holes without warning, and he put it up her ass.
Any other girl would have screamed and protested about that, however she let it be done, in reality she loved anal sex. In the end that guy came on her face and, while she smiled satisfied for having done well, he told her that he would call her. Of course no one ever called her, she had not realized that this was just a farce to have free sex with young girls.