Teen girl's surprise encounter with step-sibling while viewing nude picture

Two teenage girls were casually hanging out, and one of them stumbled upon a nude picture of a guy. Intrigued, she showed it to her friend, who was taken aback by the sight of the guy's impressive package. They couldn't help but laugh at the size of his cock, and they decided to have a little fun with it. They started talking about their sexual experiences, and the topic quickly turned to their step-brother. They realized they both had a thing for him, and they decided to take things up a notch. They went to the bathroom, and one of them started to undress, revealing her perky tits. The other girl joined in, and they began to touch themselves, getting turned on by the sight of each other. They were interrupted by their step-brother, who walked in on them. He was shocked, but he couldn't deny his desire for them. He quickly took out his cock, and one of the girls eagerly started to give him a handjob. The other girl watched, her own pussy wetting at the sight.