This stud suspects his GF is cheating on him, but he needs solid proof that she's a fucking skank. That's why he has her tied and blindfolded and lets his friend drill her slurping twat to see her reaction when she finds out who's actually fucking her. She makes it look like she's shocked and unwilling at first, but then her wild side takes over and she loves sex with a total stranger as well as a messy cumshot like a real bitch.