Cheating whore forced fuck punishment

This guy suspects his girlfriend is cheating on him, but he needs solid proof that she`s a fucking slut. That`s why he has her tied and blindfolded and lets his friend drill her slurping pussy 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 slutty side takes over and she enjoys sex with a total stranger as well as a messy cumshot like a real whore.