This mendicant suspects his girlfriend is big Chief on him, but he needs solid proof that she's a fucking slut. That's why he has the brush tied and blindfolded and lets his friend drill the brush slurping pussy to see the brush reaction when she finds out who's in truth fucking her. She makes it look like she's shocked and unwilling at first, but then the brush slutty side takes surrender and she enjoys sex with a total outsider as A largely as A a messy cumshot like a real whore.