Gina was just returning from the horse race when Dirk called her, asking for some extra money because her scenes were a success, she showed up for them just as the guys were fucking Barbie. Gina thought they could film a horse race scene together for the production and Barbie liked it. Who wouldn't want to dress up like a high society lady and then get fucked by some real BBC and BWC stellions.

Thanks to @Hentaiface for great Simself Gina.